From albrecht.schwarz@alcatel-lucent.com Wed Aug 1 07:17:19 2012 Return-Path: X-Original-To: megaco@ietfa.amsl.com Delivered-To: megaco@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 9DA6921F8CF5 for ; Wed, 1 Aug 2012 07:17:19 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -9.948 X-Spam-Level: X-Spam-Status: No, score=-9.948 tagged_above=-999 required=5 tests=[AWL=-0.300, BAYES_00=-2.599, HELO_EQ_FR=0.35, HTML_MESSAGE=0.001, J_CHICKENPOX_12=0.6, RCVD_IN_DNSWL_HI=-8] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id YSJzHOlhYYUN for ; Wed, 1 Aug 2012 07:17:17 -0700 (PDT) Received: from smail2.alcatel.fr (smail2.alcatel.fr [64.208.49.57]) by ietfa.amsl.com (Postfix) with ESMTP id D916B21F8CF3 for ; Wed, 1 Aug 2012 07:17:16 -0700 (PDT) Received: from FRMRSSXCHHUB04.dc-m.alcatel-lucent.com (FRMRSSXCHHUB04.dc-m.alcatel-lucent.com [135.120.45.64]) by smail2.alcatel.fr (8.14.3/8.14.3/ICT) with ESMTP id q71EGFxI001386 (version=TLSv1/SSLv3 cipher=RC4-MD5 bits=128 verify=NOT); Wed, 1 Aug 2012 16:17:14 +0200 Received: from FRMRSSXCHMBSD2.dc-m.alcatel-lucent.com ([135.120.45.50]) by FRMRSSXCHHUB04.dc-m.alcatel-lucent.com ([135.120.45.64]) with mapi; Wed, 1 Aug 2012 16:17:03 +0200 From: "Schwarz, Albrecht (Albrecht)" To: "3GPP_TSG_CT_WG3@LIST.ETSI.ORG" <3GPP_TSG_CT_WG3@LIST.ETSI.ORG> Date: Wed, 1 Aug 2012 16:16:56 +0200 Thread-Topic: H.248-controlled T.38 configurations: SDP- vs Property-based H.248 signalling Thread-Index: Ac1v8E49b1tSLpBZR9mXWDAW6hDlcQ== Message-ID: <5F7BCCF5541B7444830A2288ABBEBC96218B57EB6C@FRMRSSXCHMBSD2.dc-m.alcatel-lucent.com> Accept-Language: de-DE, en-US Content-Language: en-US X-MS-Has-Attach: yes X-MS-TNEF-Correlator: acceptlanguage: de-DE, en-US Content-Type: multipart/mixed; boundary="_004_5F7BCCF5541B7444830A2288ABBEBC96218B57EB6CFRMRSSXCHMBSD_" MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.69 on 155.132.188.80 X-Mailman-Approved-At: Wed, 01 Aug 2012 10:13:14 -0700 Cc: "megaco@ietf.org" Subject: [Megaco] H.248-controlled T.38 configurations: SDP- vs Property-based H.248 signalling X-BeenThere: megaco@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Media Gateway Control List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 01 Aug 2012 14:17:19 -0000 --_004_5F7BCCF5541B7444830A2288ABBEBC96218B57EB6CFRMRSSXCHMBSD_ Content-Type: multipart/alternative; boundary="_000_5F7BCCF5541B7444830A2288ABBEBC96218B57EB6CFRMRSSXCHMBSD_" --_000_5F7BCCF5541B7444830A2288ABBEBC96218B57EB6CFRMRSSXCHMBSD_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable [Cc'd megaco list due to H.248.2] The T.38 parameters as defined by ITU-T T.38 are related to a T.38 endpoint= implementation, such as the T.38 user plane interworking function as e.g. = located in an H.248 IP-to-TDM media gateway (e.g. 3GPP IM-MGW). There are fundamentally two signaling options for such T.38 configurations: a) SDP-based: using T.38 Annex D defined SDP elements embedded in H.24= 8 descriptors b) Property-based: using H.248.2, IP Fax package defined properties, s= uch as specified by clauses 10.1.3 to 10.1.7 Both H.248 signalling options are basically equivalent, - independent of SD= P- or Property-based signaling elements. The signaling elements relate to t= he T.38 endpoint, but NOT to any remote G3FE. [Note: the H.248 IP fax package version 1 (from 2005/2007) does not yet con= tain the latest T.38V4 (2010) parameter. But this aspect is irrelevant in t= his discussion due to the proposal in 3GPP for the SDP-based method.] Thus, all "T.38 SDP attributes" (in C3-121327) are related to gateway capabilitie= s (such as supported T.38 configurations by an IM-MGW implementation) (NOTE= : attached is T.38 Table B.1 for H.323 gateways, which again underlines the= relation to gateway capabilities). The MGC / MGCF may be either a) aware of the supported T.38 configuration(s) by his associated MGs = or b) unaware. Awareness may be achieved via auditing or configuration management. Unawareness is basically possible, but may lead to inefficient or even inef= fective H.248 scenarios for T.38. Dependent on the amount of "supported T.38 configuration(s)" knowledge at M= GC level would be the content of the SIP-level SDP O/A procedures. Conclusions for C3-121327 (http://www.3gpp.org/ftp/tsg_ct/WG3_interworking_= ex-CN3/TSGC3_70_Chicago/Docs/C3-121327.zip): NOTEs 1 and 2 in Table X.3.1 are incorrect in my opinion. The text related to "remote CS FAX equipment" (term should be anyway replac= ed by term G3FE) should be just deleted. And there would be correspondent c= hanges at other tables. -Albrecht --_000_5F7BCCF5541B7444830A2288ABBEBC96218B57EB6CFRMRSSXCHMBSD_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable
[Cc’d megaco list due to H.248.2]=
 
The T.38 parameters as defined by ITU-T= T.38 are related to a T.38 endpoint implementation, such as the = T.38 user plane interworking function as e.g. located in an H.248 IP-to= -TDM media gateway (e.g. 3GPP IM-MGW).
 
There are fundamentally two signaling options = for such T.38 configurations:
  1. SDP-based: using T.38 Annex D defined SDP elements embedd= ed in H.248 descriptors
  2. Property-based: using H.248.2, IP= Fax package defined properties, such as specified by clauses 10.1.3 to= 10.1.7
    3.
 =
Both H.248 signalling options are basically eq= uivalent, - independent of SDP- or Property-based signaling elements. The s= ignaling elements relate to the T.38 endpoint, but NOT to any remote G3FE.<= /font>
[Note: the H.248 IP fax package version 1 (fro= m 2005/2007) does not yet contain the latest T.38V4 (2010) parameter. But t= his aspect is irrelevant in this discussion due to the proposal in 3GPP for= the SDP-based method.]
 =
Thus,
all “T.38 SDP attributes” (in C3-1= 21327) are related to gateway capabilities (such as supported T.38 configur= ations by an IM-MGW implementation) (NOTE: attached is T.38 Table B.1 for H= .323 gateways, which again underlines the relation to gateway capabilities).
The MGC / MGCF may be either
  1. aware of the supported T.38 configuration(s) by his associated MGs or
  2. unaware.
    3.
Awareness may be achieved via auditing or conf= iguration management.
Unawareness is basically possible, but may lea= d to inefficient or even ineffective H.248 scenarios for T.38.
Dependent on the amount of “supported T.= 38 configuration(s)” knowledge at MGC level would be the content of t= he SIP-level SDP O/A procedures.
 =
NOTEs 1 and 2 in Table X.3.1 are incorrect in = my opinion.
The text related to “remote CS FA= X equipment” (term should be anyway replaced by term G3FE) should be = just deleted. And there would be correspondent changes at other tabl= es.
 =
-Albrecht
 =
 =
 
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[127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 44A9621F8E39 for ; Thu, 2 Aug 2012 01:05:33 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -9.848 X-Spam-Level: X-Spam-Status: No, score=-9.848 tagged_above=-999 required=5 tests=[AWL=-0.200, BAYES_00=-2.599, HELO_EQ_FR=0.35, HTML_MESSAGE=0.001, J_CHICKENPOX_12=0.6, RCVD_IN_DNSWL_HI=-8] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id eqLL0LJmSxA4 for ; Thu, 2 Aug 2012 01:05:29 -0700 (PDT) Received: from smail5.alcatel.fr (smail5.alcatel.fr [64.208.49.27]) by ietfa.amsl.com (Postfix) with ESMTP id 3E15721F8D0F for ; Thu, 2 Aug 2012 01:05:25 -0700 (PDT) Received: from FRMRSSXCHHUB04.dc-m.alcatel-lucent.com (FRMRSSXCHHUB04.dc-m.alcatel-lucent.com [135.120.45.64]) by smail5.alcatel.fr (8.14.3/8.14.3/ICT) with ESMTP id q7285NbH016295 (version=TLSv1/SSLv3 cipher=RC4-MD5 bits=128 verify=NOT); Thu, 2 Aug 2012 10:05:24 +0200 Received: from FRMRSSXCHMBSD2.dc-m.alcatel-lucent.com ([135.120.45.50]) by FRMRSSXCHHUB04.dc-m.alcatel-lucent.com ([135.120.45.64]) with mapi; Thu, 2 Aug 2012 10:05:06 +0200 From: "Schwarz, Albrecht (Albrecht)" To: "Belling, Thomas (NSN - DE/Munich)" , "3GPP_TSG_CT_WG3@LIST.ETSI.ORG" <3GPP_TSG_CT_WG3@LIST.ETSI.ORG> Date: Thu, 2 Aug 2012 10:05:04 +0200 Thread-Topic: H.248-controlled T.38 configurations: SDP- vs Property-based H.248 signalling Thread-Index: Ac1v8E49b1tSLpBZR9mXWDAW6hDlcQAAov1QACSffzA= Message-ID: <5F7BCCF5541B7444830A2288ABBEBC96218B57EC14@FRMRSSXCHMBSD2.dc-m.alcatel-lucent.com> References: A<5F7BCCF5541B7444830A2288ABBEBC96218B57EB6C@FRMRSSXCHMBSD2.dc-m.alcatel-lucent.com> <1A8A7D59006A8240B27FF63C794CA57F01A3E46B@DEMUEXC014.nsn-intra.net> In-Reply-To: <1A8A7D59006A8240B27FF63C794CA57F01A3E46B@DEMUEXC014.nsn-intra.net> Accept-Language: de-DE, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: acceptlanguage: de-DE, en-US Content-Type: multipart/alternative; boundary="_000_5F7BCCF5541B7444830A2288ABBEBC96218B57EC14FRMRSSXCHMBSD_" MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.69 on 155.132.188.13 Cc: "megaco@ietf.org" Subject: Re: [Megaco] H.248-controlled T.38 configurations: SDP- vs Property-based H.248 signalling X-BeenThere: megaco@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Media Gateway Control List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 02 Aug 2012 08:05:33 -0000 --_000_5F7BCCF5541B7444830A2288ABBEBC96218B57EC14FRMRSSXCHMBSD_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hello Thomas, I followed the SIP Forum FoIP thread, but I fail to see that confirmation t= owards remote G3FE. Actually it's rather the opposite, see Kevin's reply to you: > (I did not find any definition of MMR format apart from "Modified > Modified Read" in T.38. However on Annex VI of T.30, MMR is defined as > the T.6 encoding. This also matches explanations in Wikipedia) > > *T38FaxTranscodingJBIG*: Indicates the ability to convert to/from JBIG > to reduce bandwidth. This > > is a boolean parameter (inclusion =3D true, exclusion =3D false). It is possible for a T.30<->T.38 gateway to provide these behaviors if desi= red, and the resulting T.38 bitstream would differ in some noticeable ways = from the T.30 bitstream. However, based on discussions with various knowled= geable parties during our previous work in this group, it appears that it i= s highly unusual for a T.38 implementation (gateway or terminal) to actuall= y perform any of these three functions. =F0 it's a gateway capability! =F0 all your three referred T.38 parameters are subject of the IM-MGW impl= ementation! and ALU supports the recommended default values by Table H.2/T.38 (which sh= ould be inline with your proposal). Hence, Kevin explicitly confirms this also as gateway capability! Regards, Albrecht From: Belling, Thomas (NSN - DE/Munich) [mailto:thomas.belling@nsn.com] Sent: Mittwoch, 1. August 2012 16:46 To: Schwarz, Albrecht (Albrecht); 3GPP_TSG_CT_WG3@LIST.ETSI.ORG Subject: RE: H.248-controlled T.38 configurations: SDP- vs Property-based H= .248 signalling Dear Albrecht, Thanks for your comments. with respect to T38FaxFillBitRemoval, T38FaxTranscodingMMR and T38FaxTransc= odingJBIG SDP attributes, to which Notes 1 and 2 relate, I had some discus= sions at the SIP forum FoIP mailing list as you suggested. And it was confirmed that unless you do some "transcoding" of the payload w= ithin T.38 at the MGW, those properties relate to the remote CS FAX endpoin= t. However, people thought that not signaling those properties in H.248v4 m= ight be OK, because the default values which then apply are likely to be su= pported by any receiving CS endpoint. The only open issue where I did not y= et receive any reply is whether any harm is done if the CS endpoint behaves= differently when sending. Thomas From: 3GPP_TSG_CT_WG3 - Core Network and Terminals WG 3 [mailto:3GPP_TSG_CT= _WG3@LIST.ETSI.ORG] On Behalf Of ext Schwarz, Albrecht (Albrecht) Sent: Wednesday, August 01, 2012 4:17 PM To: 3GPP_TSG_CT_WG3@LIST.ETSI.ORG Subject: H.248-controlled T.38 configurations: SDP- vs Property-based H.248= signalling [Cc'd megaco list due to H.248.2] The T.38 parameters as defined by ITU-T T.38 are related to a T.38 endpoint= implementation, such as the T.38 user plane interworking function as e.g. = located in an H.248 IP-to-TDM media gateway (e.g. 3GPP IM-MGW). There are fundamentally two signaling options for such T.38 configurations: 1. SDP-based: using T.38 Annex D defined SDP elements embedded in H.248 d= escriptors 2. Property-based: using H.248.2, IP Fax package defined properties, such= as specified by clauses 10.1.3 to 10.1.7 Both H.248 signalling options are basically equivalent, - independent of SD= P- or Property-based signaling elements. The signaling elements relate to t= he T.38 endpoint, but NOT to any remote G3FE. [Note: the H.248 IP fax package version 1 (from 2005/2007) does not yet con= tain the latest T.38V4 (2010) parameter. But this aspect is irrelevant in t= his discussion due to the proposal in 3GPP for the SDP-based method.] Thus, all "T.38 SDP attributes" (in C3-121327) are related to gateway capabilitie= s (such as supported T.38 configurations by an IM-MGW implementation) (NOTE= : attached is T.38 Table B.1 for H.323 gateways, which again underlines the= relation to gateway capabilities). The MGC / MGCF may be either 1. aware of the supported T.38 configuration(s) by his associated MGs or 2. unaware. Awareness may be achieved via auditing or configuration management. Unawareness is basically possible, but may lead to inefficient or even inef= fective H.248 scenarios for T.38. Dependent on the amount of "supported T.38 configuration(s)" knowledge at M= GC level would be the content of the SIP-level SDP O/A procedures. Conclusions for C3-121327 (http://www.3gpp.org/ftp/tsg_ct/WG3_interworking_= ex-CN3/TSGC3_70_Chicago/Docs/C3-121327.zip): NOTEs 1 and 2 in Table X.3.1 are incorrect in my opinion. The text related to "remote CS FAX equipment" (term should be anyway replac= ed by term G3FE) should be just deleted. And there would be correspondent c= hanges at other tables. -Albrecht --_000_5F7BCCF5541B7444830A2288ABBEBC96218B57EC14FRMRSSXCHMBSD_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Hello T= homas,

 

I followed the SIP Forum FoI= P thread, but I fail to see that confirmation towards remote G3FE.

Actually it’s rather the= opposite, see Kevin’s reply to you:

 

> (I did not find any definition of MMR format apart fr= om “Modified

> Modified Read” in T.38. However on Annex VI of T.30, MM= R is defined as

> the T.6 encoding. This also matches explanations in Wikipedia)

>&nb= sp;

> *T38Fax= TranscodingJBIG*: Indicates the ability to convert to/from JBIG =

> to reduce bandwi= dth. This

&= gt; 

&= gt; is a boolean parameter (inclusion =3D true, exclusion =3D false).<= /o:p>

 

It is possible for a T.30<->T.38 gateway to provide these behaviors if desired, and the resulting= T.38 bitstream would differ in some noticeable ways from the T.30 bitstrea= m. However, based on discussions with various knowledgeable parties during = our previous work in this group, it appears that it is highly unusual for a= T.38 implementation (gateway or terminal) to actually perform any of these= three functions.

 

 

=F0  it’s a gateway capability!

=F0  all your three referred T.38 parameters are subject of the = IM-MGW implementation!

and ALU supports the recommended default values by Table H.2/T.38 (which s= hould be inline with your proposal).

 

Hence, Kevin explicitly confirms this also as gateway capability!

 

Regards,

&nbs= p;

 

 

 =

From: Belling, Thomas (NSN - DE/Munich) [mailto:thomas.belling@nsn.com]
Sent: Mittwoch, 1. August 2012 16:46
To: Schwarz, Albrecht (= Albrecht); 3GPP_TSG_CT_WG3@LIST.ETSI.ORG
Subject: RE: H.248-contr= olled T.38 configurations: SDP- vs Property-based H.248 signalling

 

Dear Albrecht,

 

Thanks for your comments.

 

with respect to T38FaxFillBitRemoval, T= 38FaxTranscodingMMR and T38FaxTranscodingJBIG SDP attributes, to which Note= s 1 and 2 relate,  I had some discussions at the SIP forum FoIP mailin= g list as you suggested.

 

And it was confirmed that unless you do some “transcoding”= ; of the payload within T.38 at the MGW, those properties relate to the rem= ote CS FAX endpoint. However, people thought that not signaling those prope= rties in H.248v4 might be OK, because the default values which then apply a= re likely to be supported by any receiving CS endpoint. The only open issue= where I did not yet receive any reply is whether any harm is done if the C= S endpoint behaves differently when sending.

 

Thomas

 

 

 

From: 3GPP_TSG_CT_WG3 - Core Network and Terminals WG= 3 [mailto:3GPP_TSG_CT_WG3@LIST.ETSI.ORG] On Behalf Of ext Schwarz, = Albrecht (Albrecht)
Sent: Wednesday, August 01, 2012 4:17 PM
<= b>To: 3GPP_TSG_CT_WG3@LIST.ETSI.ORG
Subject: H.248-controlled= T.38 configurations: SDP- vs Property-based H.248 signalling

 

[Cc’d megaco list due to H.248.2]

<= p class=3DMsoNormal> 

The T= .38 parameters as defined by ITU-T T.38 are related to a T.38 endpoi= nt implementation, such as the T.38 user plane interworking function= as e.g. located in an H.248 IP-to-TDM media gateway (e.g. 3GPP IM-MGW)= .

 

<= p class=3DMsoNormal>There are fundamentally two signaling options for such T.= 38 configurations:

  1. SDP-based: using T.38 Annex D defined SDP elements embe= dded in H.248 descriptors
  2. Property-based: using H.248.2, IP Fax package defined properties, s= uch as specified by clauses 10.1.3 to 10.1.7

 

Both H.248 signalling options are basically equivalent, - independent o= f SDP- or Property-based signaling elements. The signaling elements relate = to the T.38 endpoint, but NOT to any remote G3FE.

 

Thus,

all “T.38 SDP attributes” (in C3-121327) are related= to gateway capabilities (such as supported T.38 configurations by an IM-MG= W implementation) (NOTE: attached is T.38 Table B.1 for H.323 gateways, whi= ch again underlines the relation to gateway capabilities).

The MGC / MGCF may be either

  • aware of the supported T= .38 configuration(s) by his associated MGs or
  • unaware.

    • Awareness may be achieved via auditing or configuration management.=

    Unawareness is basically possibl= e, but may lead to inefficient or even ineffective H.248 scenarios for T.38= .

    Dependent on the amount of R= 20;supported T.38 configuration(s)” knowledge at MGC level would be t= he content of the SIP-level SDP O/A procedures.

     

    NOTEs 1 and 2 in Table X.3= .1 are incorrect in my opinion.

    T= he text related to “remote CS FAX equipment” (term shoul= d be anyway replaced by term G3FE) should be just deleted. And there= would be correspondent changes at other tables.

     

    -= Albrecht<= o:p>

     =

     

     
    = --_000_5F7BCCF5541B7444830A2288ABBEBC96218B57EC14FRMRSSXCHMBSD_-- From Christian.Groves@nteczone.com Fri Aug 3 03:35:23 2012 Return-Path: X-Original-To: megaco@ietfa.amsl.com Delivered-To: megaco@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id EAB0E21F8D44 for ; Fri, 3 Aug 2012 03:35:23 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.204 X-Spam-Level: X-Spam-Status: No, score=-2.204 tagged_above=-999 required=5 tests=[AWL=-0.205, BAYES_00=-2.599, J_CHICKENPOX_12=0.6] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id ypMvPYFebQBJ for ; Fri, 3 Aug 2012 03:35:23 -0700 (PDT) Received: from ipmail05.adl6.internode.on.net (ipmail05.adl6.internode.on.net [IPv6:2001:44b8:8060:ff02:300:1:6:5]) by ietfa.amsl.com (Postfix) with ESMTP id 12C2821F8D43 for ; Fri, 3 Aug 2012 03:35:22 -0700 (PDT) X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: ApMBAE6oG1B20ejj/2dsb2JhbAANOLxOAQEBBAEBAS8BBRsbBAYBEAsYCRYPCQMCAQIBFTAGDQEFAgEBiBSoZJQKi0eHBAOgTId6 Received: from ppp118-209-232-227.lns20.mel6.internode.on.net (HELO [127.0.0.1]) ([118.209.232.227]) by ipmail05.adl6.internode.on.net with ESMTP; 03 Aug 2012 20:05:17 +0930 Message-ID: <501BA95A.7060007@nteczone.com> Date: Fri, 03 Aug 2012 20:35:06 +1000 From: Christian Groves User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:14.0) Gecko/20120713 Thunderbird/14.0 MIME-Version: 1.0 To: "Schwarz, Albrecht (Albrecht)" References: <5F7BCCF5541B7444830A2288ABBEBC96218B57EB6C@FRMRSSXCHMBSD2.dc-m.alcatel-lucent.com> In-Reply-To: <5F7BCCF5541B7444830A2288ABBEBC96218B57EB6C@FRMRSSXCHMBSD2.dc-m.alcatel-lucent.com> Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 8bit Cc: "megaco@ietf.org" , "3GPP_TSG_CT_WG3@LIST.ETSI.ORG" <3GPP_TSG_CT_WG3@LIST.ETSI.ORG> Subject: Re: [Megaco] H.248-controlled T.38 configurations: SDP- vs Property-based H.248 signalling X-BeenThere: megaco@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Media Gateway Control List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 03 Aug 2012 10:35:24 -0000 Hello Albrecht, Yes I would agree that signalling elements from H.248.2 relate to the T.38 termination on a MG, i.e. the endpoint on a local MG. H.245 Annex B also indicates that T.38 parameters such as fillBiTRemoval and TranscodingJBIG indicate the gateway is in scope. Regards, Christian On 2/08/2012 12:16 AM, Schwarz, Albrecht (Albrecht) wrote: > [Cc’d megaco list due to H.248.2] > The *T.38 parameters* as defined by ITU-T T.38 are related to a *T.38 > endpoint implementation*, such as the *T.38 user plane interworking > function* as e.g. located in an H.248 IP-to-TDM media gateway (e.g. > 3GPP IM-MGW). > There are fundamentally two signaling options for such T.38 > configurations: > > 1. *SDP-based*: using *T.38 Annex D* defined SDP elements embedded in > H.248 descriptors > 2. *Property-based*: using *H.248.2, IP Fax package* defined > properties, such as specified by clauses 10.1.3 to 10.1.7 > > Both H.248 signalling options are basically equivalent, - independent > of SDP- or Property-based signaling elements. The signaling elements > relate to the T.38 endpoint, but NOT to any remote G3FE. > [Note: the H.248 IP fax package version 1 (from 2005/2007) does not > yet contain the latest T.38V4 (2010) parameter. But this aspect is > irrelevant in this discussion due to the proposal in 3GPP for the > SDP-based method.] > Thus, > all “T.38 SDP attributes” (in C3-121327) are related to gateway > capabilities (such as supported T.38 configurations by an IM-MGW > implementation) (NOTE: attached is T.38 Table B.1 for H.323 gateways, > which again underlines the relation to gateway capabilities). > The MGC / MGCF may be either > > 1. aware of the supported T.38 configuration(s) by his associated MGs or > 2. unaware. > > Awareness may be achieved via auditing or configuration management. > Unawareness is basically possible, but may lead to inefficient or even > ineffective H.248 scenarios for T.38. > Dependent on the amount of “supported T.38 configuration(s)” knowledge > at MGC level would be the content of the SIP-level SDP O/A procedures. > Conclusions for *C3-121327* > (_http://www.3gpp.org/ftp/tsg_ct/WG3_interworking_ex-CN3/TSGC3_70_Chicago/Docs/C3-121327.zip_): > NOTEs 1 and 2 in Table X.3.1 are incorrect in my opinion. > The *text* related to “remote CS FAX equipment” (term should be anyway > replaced by term G3FE) should be just *deleted*. And there would be > correspondent changes at other tables. > -Albrecht > > > _______________________________________________ > Megaco mailing list > Megaco@ietf.org > https://www.ietf.org/mailman/listinfo/megaco From albrecht.schwarz@alcatel-lucent.com Fri Aug 3 01:26:00 2012 Return-Path: X-Original-To: megaco@ietfa.amsl.com Delivered-To: megaco@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 8D92E21F8CC9 for ; Fri, 3 Aug 2012 01:26:00 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -8.898 X-Spam-Level: X-Spam-Status: No, score=-8.898 tagged_above=-999 required=5 tests=[AWL=-1.050, BAYES_00=-2.599, HELO_EQ_FR=0.35, HTML_MESSAGE=0.001, J_CHICKENPOX_12=0.6, J_CHICKENPOX_13=0.6, RCVD_IN_DNSWL_HI=-8, SARE_OEM_S_DOL=1.2] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id nObbby53DXIL for ; Fri, 3 Aug 2012 01:25:55 -0700 (PDT) Received: from smail3.alcatel.fr (smail3.alcatel.fr [64.208.49.56]) by ietfa.amsl.com (Postfix) with ESMTP id 59B1621F8C3F for ; Fri, 3 Aug 2012 01:25:53 -0700 (PDT) Received: from FRMRSSXCHHUB01.dc-m.alcatel-lucent.com (FRMRSSXCHHUB01.dc-m.alcatel-lucent.com [135.120.45.61]) by smail3.alcatel.fr (8.14.3/8.14.3/ICT) with ESMTP id q738PBt6008660 (version=TLSv1/SSLv3 cipher=RC4-MD5 bits=128 verify=NOT); Fri, 3 Aug 2012 10:25:47 +0200 Received: from FRMRSSXCHMBSD2.dc-m.alcatel-lucent.com ([135.120.45.50]) by FRMRSSXCHHUB01.dc-m.alcatel-lucent.com ([135.120.45.61]) with mapi; Fri, 3 Aug 2012 10:25:12 +0200 From: "Schwarz, Albrecht (Albrecht)" To: "Belling, Thomas (NSN - DE/Munich)" , "3GPP_TSG_CT_WG3@LIST.ETSI.ORG" <3GPP_TSG_CT_WG3@LIST.ETSI.ORG> Date: Fri, 3 Aug 2012 10:25:11 +0200 Thread-Topic: H.248-controlled T.38 configurations: SDP- vs Property-based H.248 signalling Thread-Index: Ac1v8E49b1tSLpBZR9mXWDAW6hDlcQAAov1QACSffzAAAfKnwAAwrdSQ Message-ID: <5F7BCCF5541B7444830A2288ABBEBC96218B57EDB5@FRMRSSXCHMBSD2.dc-m.alcatel-lucent.com> References: A<5F7BCCF5541B7444830A2288ABBEBC96218B57EB6C@FRMRSSXCHMBSD2.dc-m.alcatel-lucent.com> <1A8A7D59006A8240B27FF63C794CA57F01A3E46B@DEMUEXC014.nsn-intra.net> A<5F7BCCF5541B7444830A2288ABBEBC96218B57EC14@FRMRSSXCHMBSD2.dc-m.alcatel-lucent.com> <1A8A7D59006A8240B27FF63C794CA57F01A3E63F@DEMUEXC014.nsn-intra.net> In-Reply-To: <1A8A7D59006A8240B27FF63C794CA57F01A3E63F@DEMUEXC014.nsn-intra.net> Accept-Language: de-DE, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: acceptlanguage: de-DE, en-US Content-Type: multipart/alternative; boundary="_000_5F7BCCF5541B7444830A2288ABBEBC96218B57EDB5FRMRSSXCHMBSD_" MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.69 on 155.132.188.83 X-Mailman-Approved-At: Fri, 03 Aug 2012 08:36:55 -0700 Cc: "megaco@ietf.org" Subject: Re: [Megaco] H.248-controlled T.38 configurations: SDP- vs Property-based H.248 signalling X-BeenThere: megaco@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Media Gateway Control List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 03 Aug 2012 08:26:00 -0000 --_000_5F7BCCF5541B7444830A2288ABBEBC96218B57EDB5FRMRSSXCHMBSD_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hello Thomas, looks like that we are now on the same page, i.e. if the T.38 endpoint (her= e IM-MGW) would support that capability, then it could be also used in the = negotiation of T.38 configurations with the remote T.38 endpoint. Hence, the T.38 parameters are not related to remote G3FEs. There would be then following changes in your CRs, let's take Table X.2.1 a= s example: Table X.2.1: Recommended configuration for T.38 SDP attribute values. T38FaxVersion Version 2 or higher. (NOTE 1) T38MaxBitRate 14 400 T38FaxFillBitRemoval FALSE (NOTE 2) T38FaxTranscodingMMR FALSE (NOTE 2) T38FaxTranscodingJBIG FALSE (NOTE 2) T38FaxRateManagement 'transferredTCF' T38FaxMaxBuffer 1800 T38FaxMaxDatagram At least 150 T38FaxMaxIFP 40 (NOTE 3) T38FaxUdpEC 't38UDPRedundancy' T38FaxUdpECDepth Minred: 1; Maxred: 2 (NOTE 3) T38FaxUdpFECMaxSpan 3 (NOTE 3) T38ModemType 't38G3FaxOnly' (NOTE 2, NOTE 3) NOTE 1: With Version 4, default values for the SDP attributes apply if t= he attributes are omitted. However, some values relate to capabilities of t= he remote CS FAX equipment unknown to the MGCF. NOTE 2: This value relates to capabilities of the remote CS FAX equipmen= t unknown to the MGCF. The recommended value (which is also the default val= ue in T.38 version 4) is likely to be supported by FAX equipment in CS netw= orks. NOTE 3: Only applicable for T.38 version 4. Would you agree? Albrecht From: Belling, Thomas (NSN - DE/Munich) [mailto:thomas.belling@nsn.com] Sent: Donnerstag, 2. August 2012 11:03 To: Schwarz, Albrecht (Albrecht); 3GPP_TSG_CT_WG3@LIST.ETSI.ORG Subject: RE: H.248-controlled T.38 configurations: SDP- vs Property-based H= .248 signalling Hello Albrecht, a gateway could support FAX "transcoding", as I like to call it, and then u= se those parameters. But as Kevin wrote, it is highly unusual for MGW imple= mentations to do so. In my view we should not burden the MGW with such func= tionality and the benefit is also questionable, in particular because Kevin= believes the JBIG and NMR encoding are also rarely used by T.38 terminals.= I was rather envisioning a reframing of T.30 at the MGW. Reading your expl= anation that you support the default values I suspect this is also what you= r MGW does (as mine). Also in the table B.1 you attached those parameters a= re "optional". So, depending on MGW implementation, those could either be c= apabilities of the CS FAX equipment (if a reframing is done at the MGW as I= envision), or of the MGW (if the MGW performs FAX "transcoding"). For the 3GPP profiles, we do not necesarrily include any conceivable option= but only options with a real benefit. I would prefer not to include FAX "t= ranscoding" for the reasons outlined above. Assuming that we only want to u= se the default value, it does not need to be signalled to the MGW but can r= ather be a provisioned value. So I do not see a need to propagate those par= ameters over the Mn interface. Perhaps the NOTES should be phrased a bit clearer and include an explanatio= n that only T.30 reframing is included in the Mn profile and under this con= dition, those SDP attributes relate to capabilities of the CS FAX equipment= . Thomas From: 3GPP_TSG_CT_WG3 - Core Network and Terminals WG 3 [mailto:3GPP_TSG_CT= _WG3@LIST.ETSI.ORG] On Behalf Of ext Schwarz, Albrecht (Albrecht) Sent: Thursday, August 02, 2012 10:05 AM To: 3GPP_TSG_CT_WG3@LIST.ETSI.ORG Subject: Re: H.248-controlled T.38 configurations: SDP- vs Property-based H= .248 signalling Hello Thomas, I followed the SIP Forum FoIP thread, but I fail to see that confirmation t= owards remote G3FE. Actually it's rather the opposite, see Kevin's reply to you: > (I did not find any definition of MMR format apart from "Modified > Modified Read" in T.38. However on Annex VI of T.30, MMR is defined as > the T.6 encoding. This also matches explanations in Wikipedia) > > *T38FaxTranscodingJBIG*: Indicates the ability to convert to/from JBIG > to reduce bandwidth. This > > is a boolean parameter (inclusion =3D true, exclusion =3D false). It is possible for a T.30<->T.38 gateway to provide these behaviors if desi= red, and the resulting T.38 bitstream would differ in some noticeable ways = from the T.30 bitstream. However, based on discussions with various knowled= geable parties during our previous work in this group, it appears that it i= s highly unusual for a T.38 implementation (gateway or terminal) to actuall= y perform any of these three functions. =F0 it's a gateway capability! =F0 all your three referred T.38 parameters are subject of the IM-MGW impl= ementation! and ALU supports the recommended default values by Table H.2/T.38 (which sh= ould be inline with your proposal). Hence, Kevin explicitly confirms this also as gateway capability! Regards, Albrecht From: Belling, Thomas (NSN - DE/Munich) [mailto:thomas.belling@nsn.com] Sent: Mittwoch, 1. August 2012 16:46 To: Schwarz, Albrecht (Albrecht); 3GPP_TSG_CT_WG3@LIST.ETSI.ORG Subject: RE: H.248-controlled T.38 configurations: SDP- vs Property-based H= .248 signalling Dear Albrecht, Thanks for your comments. with respect to T38FaxFillBitRemoval, T38FaxTranscodingMMR and T38FaxTransc= odingJBIG SDP attributes, to which Notes 1 and 2 relate, I had some discus= sions at the SIP forum FoIP mailing list as you suggested. And it was confirmed that unless you do some "transcoding" of the payload w= ithin T.38 at the MGW, those properties relate to the remote CS FAX endpoin= t. However, people thought that not signaling those properties in H.248v4 m= ight be OK, because the default values which then apply are likely to be su= pported by any receiving CS endpoint. The only open issue where I did not y= et receive any reply is whether any harm is done if the CS endpoint behaves= differently when sending. Thomas From: 3GPP_TSG_CT_WG3 - Core Network and Terminals WG 3 [mailto:3GPP_TSG_CT= _WG3@LIST.ETSI.ORG] On Behalf Of ext Schwarz, Albrecht (Albrecht) Sent: Wednesday, August 01, 2012 4:17 PM To: 3GPP_TSG_CT_WG3@LIST.ETSI.ORG Subject: H.248-controlled T.38 configurations: SDP- vs Property-based H.248= signalling [Cc'd megaco list due to H.248.2] The T.38 parameters as defined by ITU-T T.38 are related to a T.38 endpoint= implementation, such as the T.38 user plane interworking function as e.g. = located in an H.248 IP-to-TDM media gateway (e.g. 3GPP IM-MGW). There are fundamentally two signaling options for such T.38 configurations: 1. SDP-based: using T.38 Annex D defined SDP elements embedded in H.248 d= escriptors 2. Property-based: using H.248.2, IP Fax package defined properties, such= as specified by clauses 10.1.3 to 10.1.7 Both H.248 signalling options are basically equivalent, - independent of SD= P- or Property-based signaling elements. The signaling elements relate to t= he T.38 endpoint, but NOT to any remote G3FE. [Note: the H.248 IP fax package version 1 (from 2005/2007) does not yet con= tain the latest T.38V4 (2010) parameter. But this aspect is irrelevant in t= his discussion due to the proposal in 3GPP for the SDP-based method.] Thus, all "T.38 SDP attributes" (in C3-121327) are related to gateway capabilitie= s (such as supported T.38 configurations by an IM-MGW implementation) (NOTE= : attached is T.38 Table B.1 for H.323 gateways, which again underlines the= relation to gateway capabilities). The MGC / MGCF may be either 1. aware of the supported T.38 configuration(s) by his associated MGs or 2. unaware. Awareness may be achieved via auditing or configuration management. Unawareness is basically possible, but may lead to inefficient or even inef= fective H.248 scenarios for T.38. Dependent on the amount of "supported T.38 configuration(s)" knowledge at M= GC level would be the content of the SIP-level SDP O/A procedures. Conclusions for C3-121327 (http://www.3gpp.org/ftp/tsg_ct/WG3_interworking_= ex-CN3/TSGC3_70_Chicago/Docs/C3-121327.zip): NOTEs 1 and 2 in Table X.3.1 are incorrect in my opinion. The text related to "remote CS FAX equipment" (term should be anyway replac= ed by term G3FE) should be just deleted. And there would be correspondent c= hanges at other tables. -Albrecht --_000_5F7BCCF5541B7444830A2288ABBEBC96218B57EDB5FRMRSSXCHMBSD_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

    Hello T= homas,

    looks like th= at we are now on the same page, i.e. if the T.38 endpoint (here IM-MGW) wou= ld support that capability, then it could be also used in the negotiation o= f T.38 configurations with the remote T.38 endpoint.

    <= p class=3DMsoNormal>Hence, the T.38 parameters are not related t= o remote G3FEs.

    There = would be then following changes in your CRs, let’s take Table X.2.1 a= s example:

     =

     

    Table X.2.1: Recommended configuration for T.38 SDP a= ttribute values.

    = =

    Minre= d: 1; Maxred: 2 (NOTE 3)

    =

    T38FaxVersion

    Version 2 or h= igher. (NOTE 1)

    T38Ma= xBitRate

    14 400

    T38FaxFillBitRemo= val

    FALSE (NOTE 2)

    <= /td>

    T38FaxTranscodingMMR

    FALSE (NOTE 2)

    T38FaxTranscodingJBIG

    FALSE (NOTE 2)

    T38FaxRateManagement=

    'transferredTCF'

    T38FaxMaxBuffer

    1800

    T38FaxMaxDatagram

    At least 150

    =

    T38FaxMaxIFP

    =

    40 (NOTE 3)

    T38FaxUdp= EC

    't38UDPRedundancy'

    T38FaxUdpECDepth

    3 (NOTE 3)

    <= p class=3DTAL>T38ModemType

    <= /td>

    't38G3FaxOnly' (NOTE 2, NOTE 3)

    NOTE 1:=A0=A0=A0 With Version 4, default values f= or the SDP attributes apply if the attributes are omitted. However, some= values relate to capabilities of the remote CS FAX equipment unknown to th= e MGCF.

    <= s>NOTE 2:=A0=A0=A0 This value relates to capabilities of= the remote CS FAX equipment unknown to the MGCF. The recommended value (wh= ich is also the default value in T.38 version 4) is likely to be supported = by FAX equipment in CS networks.

    NOTE 3: =A0=A0 Only applicable for T.38 version 4.

     

    Would you agree?

    <= span lang=3DEN-GB style=3D'font-size:10.0pt;font-family:"Courier New";color= :#003300'>Albrecht

     

     <= /span>

    From: = Belling, Thomas (NSN - DE/Munich) [mailto:thomas.belling@nsn.com]
    Se= nt: Donnerstag, 2. August 2012 11:03
    To: Schwarz, Albrecht (A= lbrecht); 3GPP_TSG_CT_WG3@LIST.ETSI.ORG
    Subject: RE: H.248-contro= lled T.38 configurations: SDP- vs Property-based H.248 signalling

     

    Hello Albrecht,

     

    a gateway could support FAX “transcodin= g”, as I like to call it, and then use those parameters. But as Kevin= wrote, it is highly unusual for MGW implementations to do so. In my view w= e should not burden the MGW with such functionality and the benefit is also= questionable, in particular because Kevin believes the JBIG and NMR encodi= ng are also rarely used by T.38 terminals. I was rather envisioning a refra= ming of T.30 at the MGW. Reading your explanation that you support the defa= ult values I suspect this is also what your MGW does (as mine). Also in the= table B.1 you attached those parameters are “optional”. So, de= pending on MGW implementation, those could either be capabilities of the CS= FAX equipment (if a reframing is done at the MGW as I envision), or of the= MGW (if the MGW performs FAX “transcoding”).=

     

    For the 3GPP profiles, we do not nec= esarrily include any conceivable option but only options with a real benefi= t. I would prefer not to include FAX “transcoding” for the reas= ons outlined above. Assuming that we only want to use the default value, it= does not need to be signalled to the MGW but can rather be a provisioned v= alue. So I do not see a need to propagate those parameters over the Mn inte= rface.

     

    Perhaps th= e NOTES should be phrased a bit clearer and include an explanation that onl= y T.30 reframing is included in the Mn profile and under this condition, th= ose SDP attributes relate to capabilities of the CS FAX equipment.

     

    Thomas

     

     

     

    = From: 3GPP_TSG_CT_WG3 - Core Network and Terminals WG 3 [ma= ilto:3GPP_TSG_CT_WG3@LIST.ETSI.ORG] On Behalf Of ext Schwarz, Albrec= ht (Albrecht)
    Sent: Thursday, August 02, 2012 10:05 AM
    To:<= /b> 3GPP_TSG_CT_WG3@LIST.ETSI.ORG
    Subject: Re: H.248-controlled T= .38 configurations: SDP- vs Property-based H.248 signalling

     

     

    I foll= owed the SIP Forum FoIP thread, but I fail to see that confirmation towards= remote G3FE.

    Actually= it’s rather the opposite, see Kevin’s reply to you:=

     

    > (I did not find any definition = of MMR format apart from “Modified

    > Modified Read” in T.38. However o= n Annex VI of T.30, MMR is defined as

    > the T.6 encoding. This also matches explan= ations in Wikipedia)

    > 

    > *T38FaxTranscodingJBIG*: Indicates the ability to convert to= /from JBIG

    > to reduce bandwidth. This

    > 

    > is a boolean parameter (inclusion =3D true, exclu= sion =3D false).

     

    It is possible for a T.30<->T.38 gateway<= /span> to provide these behaviors if desired, and the resulting T.38 bitstream would differ in some noticeable ways f= rom the T.30 bitstream. However, based on discussions with various knowledg= eable parties during our previous work in this group, it appears that it is= highly unusual for a T.38 implementation (gateway or terminal) to actually= perform any of these three functions.

    =F0 = ; it’s a gateway capability= !

    =F0  all your three referred T.38 parameter= s are subject of the IM-MGW implementation!

    and ALU supports the recommended default values by = Table H.2/T.38 (which should be inline with your proposal).

     

    Hence, Kevin explicitly confirms this also as gatew= ay capability!

    &n= bsp;

    Regards,

    Albrecht

     

     

     

     

    From: Belling, Thomas (NSN - DE/Munich) [mailto:thomas.belling@nsn.com]
    Sent: Mittwoch, 1. August 2012 16:46
    To: Schwarz, Albrecht (Albrecht= ); 3GPP_TSG_CT_WG3@LIST.ET= SI.ORG
    Subject: RE: H.248-controlled T.38 configurations: SDP= - vs Property-based H.248 signalling

     

    Dear Albrecht,

     

    T= hanks for your comments.

     

    with respect to T38FaxFillBitRemoval, T38FaxTranscodingMMR and T38Fax= TranscodingJBIG SDP attributes, to which Notes 1 and 2 relate,  I had = some discussions at the SIP forum FoIP mailing list as you suggested.<= /o:p>

     <= /span>

    And it was confirmed tha= t unless you do some “transcoding” of the payload within T.38 a= t the MGW, those properties relate to the remote CS FAX endpoint. However, = people thought that not signaling those properties in H.248v4 might be OK, = because the default values which then apply are likely to be supported by a= ny receiving CS endpoint. The only open issue where I did not yet receive a= ny reply is whether any harm is done if the CS endpoint behaves differently= when sending.

     

    Thom= as

     = ;

     

     

    From: 3GPP= _TSG_CT_WG3 - Core Network and Terminals WG 3 [mailto:3GPP_TSG_CT_WG3@LIST.ETSI.ORG] On Behalf= Of ext Schwarz, Albrecht (Albrecht)
    Sent: Wednesday, August = 01, 2012 4:17 PM
    To: 3GPP_TSG_CT_WG3@LIST.ETSI.ORG
    Subject: H.248-controlled = T.38 configurations: SDP- vs Property-based H.248 signalling

     

    [Cc’d megaco list due to H.248.2]

    <= p class=3DMsoNormal> 

    The T= .38 parameters as defined by ITU-T T.38 are related to a T.38 endpoi= nt implementation, such as the T.38 user plane interworking function= as e.g. located in an H.248 IP-to-TDM media gateway (e.g. 3GPP IM-MGW)= .

     

    <= p class=3DMsoNormal>There are fundamentally two signaling options for such T.= 38 configurations:

    1. SDP-based: using T.38 Annex D defined SDP elements embe= dded in H.248 descriptors
    2. Property-based: using H.248.2, IP Fax package defined properties, s= uch as specified by clauses 10.1.3 to 10.1.7

     

    Both H.248 signalling options are basically equivalent, - independent o= f SDP- or Property-based signaling elements. The signaling elements relate = to the T.38 endpoint, but NOT to any remote G3FE.

     

    Thus,

    all “T.38 SDP attributes” (in C3-121327) are related= to gateway capabilities (such as supported T.38 configurations by an IM-MG= W implementation) (NOTE: attached is T.38 Table B.1 for H.323 gateways, whi= ch again underlines the relation to gateway capabilities).

    The MGC / MGCF may be either

  • aware of the supported T= .38 configuration(s) by his associated MGs or
  • unaware.

    • Awareness may be achieved via auditing or configuration management.=

    Unawareness is basically possibl= e, but may lead to inefficient or even ineffective H.248 scenarios for T.38= .

    Dependent on the amount of R= 20;supported T.38 configuration(s)” knowledge at MGC level would be t= he content of the SIP-level SDP O/A procedures.

     

    NOTEs 1 and 2 in Table X.3= .1 are incorrect in my opinion.

    T= he text related to “remote CS FAX equipment” (term shoul= d be anyway replaced by term G3FE) should be just deleted. And there= would be correspondent changes at other tables.

     

    -= Albrecht<= o:p>

     =

     

     
    = --_000_5F7BCCF5541B7444830A2288ABBEBC96218B57EDB5FRMRSSXCHMBSD_-- From albrecht.schwarz@alcatel-lucent.com Fri Aug 3 02:10:32 2012 Return-Path: X-Original-To: megaco@ietfa.amsl.com Delivered-To: megaco@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 58D6521F8D4A for ; Fri, 3 Aug 2012 02:10:32 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -6.688 X-Spam-Level: X-Spam-Status: No, score=-6.688 tagged_above=-999 required=5 tests=[AWL=-2.840, BAYES_00=-2.599, HELO_EQ_FR=0.35, HTML_MESSAGE=0.001, J_CHICKENPOX_12=0.6, J_CHICKENPOX_13=0.6, RCVD_IN_DNSWL_MED=-4, SARE_OEM_S_DOL=1.2] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id lakR1k1nOE0N for ; Fri, 3 Aug 2012 02:10:25 -0700 (PDT) Received: from smail5.alcatel.fr (smail5.alcatel.fr [62.23.212.27]) by ietfa.amsl.com (Postfix) with ESMTP id 1339F21F8D1D for ; Fri, 3 Aug 2012 02:10:24 -0700 (PDT) Received: from FRMRSSXCHHUB04.dc-m.alcatel-lucent.com (FRMRSSXCHHUB04.dc-m.alcatel-lucent.com [135.120.45.64]) by smail5.alcatel.fr (8.14.3/8.14.3/ICT) with ESMTP id q739AECV010231 (version=TLSv1/SSLv3 cipher=RC4-MD5 bits=128 verify=NOT); Fri, 3 Aug 2012 11:10:22 +0200 Received: from FRMRSSXCHMBSD2.dc-m.alcatel-lucent.com ([135.120.45.50]) by FRMRSSXCHHUB04.dc-m.alcatel-lucent.com ([135.120.45.64]) with mapi; Fri, 3 Aug 2012 11:09:49 +0200 From: "Schwarz, Albrecht (Albrecht)" To: "Belling, Thomas (NSN - DE/Munich)" , "3GPP_TSG_CT_WG3@LIST.ETSI.ORG" <3GPP_TSG_CT_WG3@LIST.ETSI.ORG> Date: Fri, 3 Aug 2012 11:09:47 +0200 Thread-Topic: H.248-controlled T.38 configurations: SDP- vs Property-based H.248 signalling Thread-Index: Ac1v8E49b1tSLpBZR9mXWDAW6hDlcQAAov1QACSffzAAAfKnwAAwrdSQAAEGPRAAAF+FgA== Message-ID: <5F7BCCF5541B7444830A2288ABBEBC96218B57EDCD@FRMRSSXCHMBSD2.dc-m.alcatel-lucent.com> References: A<5F7BCCF5541B7444830A2288ABBEBC96218B57EB6C@FRMRSSXCHMBSD2.dc-m.alcatel-lucent.com> <1A8A7D59006A8240B27FF63C794CA57F01A3E46B@DEMUEXC014.nsn-intra.net> A<5F7BCCF5541B7444830A2288ABBEBC96218B57EC14@FRMRSSXCHMBSD2.dc-m.alcatel-lucent.com> <1A8A7D59006A8240B27FF63C794CA57F01A3E63F@DEMUEXC014.nsn-intra.net> <5F7BCCF5541B7444830A2288ABBEBC96218B57EDB5@FRMRSSXCHMBSD2.dc-m.alcatel-lucent.com> <1A8A7D59006A8240B27FF63C794CA57F01A3E962@DEMUEXC014.nsn-intra.net> In-Reply-To: <1A8A7D59006A8240B27FF63C794CA57F01A3E962@DEMUEXC014.nsn-intra.net> Accept-Language: de-DE, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: acceptlanguage: de-DE, en-US Content-Type: multipart/alternative; boundary="_000_5F7BCCF5541B7444830A2288ABBEBC96218B57EDCDFRMRSSXCHMBSD_" MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.69 on 155.132.188.13 X-Mailman-Approved-At: Fri, 03 Aug 2012 08:36:55 -0700 Cc: "megaco@ietf.org" Subject: Re: [Megaco] H.248-controlled T.38 configurations: SDP- vs Property-based H.248 signalling X-BeenThere: megaco@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Media Gateway Control List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 03 Aug 2012 09:10:32 -0000 --_000_5F7BCCF5541B7444830A2288ABBEBC96218B57EDCDFRMRSSXCHMBSD_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable With below indicated changes, we recommended the default settings for those= T.38 parameters, which is FALSE (i.e., 3GPP profiles would then recommend = NOT to use such T.38 configurations). Clause X.2 provides a RECOMMENDATION on T.38 configuration(s). Clause X.3 the correspondent negotiation procedures. I think that the prescriptive language between both clauses must be consist= ent (which isn't yet entirely the case in my opinion). E.g., Table X.3.1: T38FaxTranscodingJBIG Accept offer with value "FALSE" or parameter omitted. Otherwise reject offe= r (NOTE 3). Do not include parameter in the answer. (NOTE 2) =F0 Instead of "Otherwise reject offer (NOTE 3)." we should rather specify "Otherwise, offer SHOULD be rejected (NOTE x)" and NOTE x - This parameter is not recommended to use, but there might be remot= e T.38 endpoints with support of that capability. In order to improve the p= robability of a final successful T.38 call, the remote T.38 endpoint should= be indicated not to use this T.38 capability (see ANSWER). A pure rejection of the OFFER would immediately lead to an unsuccessful T. = 38 call. /Albrecht From: Belling, Thomas (NSN - DE/Munich) [mailto:thomas.belling@nsn.com] Sent: Freitag, 3. August 2012 10:46 To: Schwarz, Albrecht (Albrecht); 3GPP_TSG_CT_WG3@LIST.ETSI.ORG Subject: RE: H.248-controlled T.38 configurations: SDP- vs Property-based H= .248 signalling Dear Albrecht, my proposal is still not include FAX "transcoding" in the 3GPP profile. Is = that acceptable to you? Thomas From: ext Schwarz, Albrecht (Albrecht) [mailto:albrecht.schwarz@alcatel-luc= ent.com] Sent: Friday, August 03, 2012 10:25 AM To: Belling, Thomas (NSN - DE/Munich); 3GPP_TSG_CT_WG3@LIST.ETSI.ORG Cc: megaco@ietf.org Subject: RE: H.248-controlled T.38 configurations: SDP- vs Property-based H= .248 signalling Hello Thomas, looks like that we are now on the same page, i.e. if the T.38 endpoint (her= e IM-MGW) would support that capability, then it could be also used in the = negotiation of T.38 configurations with the remote T.38 endpoint. Hence, the T.38 parameters are not related to remote G3FEs. There would be then following changes in your CRs, let's take Table X.2.1 a= s example: Table X.2.1: Recommended configuration for T.38 SDP attribute values. T38FaxVersion Version 2 or higher. (NOTE 1) T38MaxBitRate 14 400 T38FaxFillBitRemoval FALSE (NOTE 2) T38FaxTranscodingMMR FALSE (NOTE 2) T38FaxTranscodingJBIG FALSE (NOTE 2) T38FaxRateManagement 'transferredTCF' T38FaxMaxBuffer 1800 T38FaxMaxDatagram At least 150 T38FaxMaxIFP 40 (NOTE 3) T38FaxUdpEC 't38UDPRedundancy' T38FaxUdpECDepth Minred: 1; Maxred: 2 (NOTE 3) T38FaxUdpFECMaxSpan 3 (NOTE 3) T38ModemType 't38G3FaxOnly' (NOTE 2, NOTE 3) NOTE 1: With Version 4, default values for the SDP attributes apply if t= he attributes are omitted. However, some values relate to capabilities of t= he remote CS FAX equipment unknown to the MGCF. NOTE 2: This value relates to capabilities of the remote CS FAX equipmen= t unknown to the MGCF. The recommended value (which is also the default val= ue in T.38 version 4) is likely to be supported by FAX equipment in CS netw= orks. NOTE 3: Only applicable for T.38 version 4. Would you agree? Albrecht From: Belling, Thomas (NSN - DE/Munich) [mailto:thomas.belling@nsn.com] Sent: Donnerstag, 2. August 2012 11:03 To: Schwarz, Albrecht (Albrecht); 3GPP_TSG_CT_WG3@LIST.ETSI.ORG Subject: RE: H.248-controlled T.38 configurations: SDP- vs Property-based H= .248 signalling Hello Albrecht, a gateway could support FAX "transcoding", as I like to call it, and then u= se those parameters. But as Kevin wrote, it is highly unusual for MGW imple= mentations to do so. In my view we should not burden the MGW with such func= tionality and the benefit is also questionable, in particular because Kevin= believes the JBIG and NMR encoding are also rarely used by T.38 terminals.= I was rather envisioning a reframing of T.30 at the MGW. Reading your expl= anation that you support the default values I suspect this is also what you= r MGW does (as mine). Also in the table B.1 you attached those parameters a= re "optional". So, depending on MGW implementation, those could either be c= apabilities of the CS FAX equipment (if a reframing is done at the MGW as I= envision), or of the MGW (if the MGW performs FAX "transcoding"). For the 3GPP profiles, we do not necesarrily include any conceivable option= but only options with a real benefit. I would prefer not to include FAX "t= ranscoding" for the reasons outlined above. Assuming that we only want to u= se the default value, it does not need to be signalled to the MGW but can r= ather be a provisioned value. So I do not see a need to propagate those par= ameters over the Mn interface. Perhaps the NOTES should be phrased a bit clearer and include an explanatio= n that only T.30 reframing is included in the Mn profile and under this con= dition, those SDP attributes relate to capabilities of the CS FAX equipment= . Thomas From: 3GPP_TSG_CT_WG3 - Core Network and Terminals WG 3 [mailto:3GPP_TSG_CT= _WG3@LIST.ETSI.ORG] On Behalf Of ext Schwarz, Albrecht (Albrecht) Sent: Thursday, August 02, 2012 10:05 AM To: 3GPP_TSG_CT_WG3@LIST.ETSI.ORG Subject: Re: H.248-controlled T.38 configurations: SDP- vs Property-based H= .248 signalling Hello Thomas, I followed the SIP Forum FoIP thread, but I fail to see that confirmation t= owards remote G3FE. Actually it's rather the opposite, see Kevin's reply to you: > (I did not find any definition of MMR format apart from "Modified > Modified Read" in T.38. However on Annex VI of T.30, MMR is defined as > the T.6 encoding. This also matches explanations in Wikipedia) > > *T38FaxTranscodingJBIG*: Indicates the ability to convert to/from JBIG > to reduce bandwidth. This > > is a boolean parameter (inclusion =3D true, exclusion =3D false). It is possible for a T.30<->T.38 gateway to provide these behaviors if desi= red, and the resulting T.38 bitstream would differ in some noticeable ways = from the T.30 bitstream. However, based on discussions with various knowled= geable parties during our previous work in this group, it appears that it i= s highly unusual for a T.38 implementation (gateway or terminal) to actuall= y perform any of these three functions. =F0 it's a gateway capability! =F0 all your three referred T.38 parameters are subject of the IM-MGW impl= ementation! and ALU supports the recommended default values by Table H.2/T.38 (which sh= ould be inline with your proposal). Hence, Kevin explicitly confirms this also as gateway capability! Regards, Albrecht From: Belling, Thomas (NSN - DE/Munich) [mailto:thomas.belling@nsn.com] Sent: Mittwoch, 1. August 2012 16:46 To: Schwarz, Albrecht (Albrecht); 3GPP_TSG_CT_WG3@LIST.ETSI.ORG Subject: RE: H.248-controlled T.38 configurations: SDP- vs Property-based H= .248 signalling Dear Albrecht, Thanks for your comments. with respect to T38FaxFillBitRemoval, T38FaxTranscodingMMR and T38FaxTransc= odingJBIG SDP attributes, to which Notes 1 and 2 relate, I had some discus= sions at the SIP forum FoIP mailing list as you suggested. And it was confirmed that unless you do some "transcoding" of the payload w= ithin T.38 at the MGW, those properties relate to the remote CS FAX endpoin= t. However, people thought that not signaling those properties in H.248v4 m= ight be OK, because the default values which then apply are likely to be su= pported by any receiving CS endpoint. The only open issue where I did not y= et receive any reply is whether any harm is done if the CS endpoint behaves= differently when sending. Thomas From: 3GPP_TSG_CT_WG3 - Core Network and Terminals WG 3 [mailto:3GPP_TSG_CT= _WG3@LIST.ETSI.ORG] On Behalf Of ext Schwarz, Albrecht (Albrecht) Sent: Wednesday, August 01, 2012 4:17 PM To: 3GPP_TSG_CT_WG3@LIST.ETSI.ORG Subject: H.248-controlled T.38 configurations: SDP- vs Property-based H.248= signalling [Cc'd megaco list due to H.248.2] The T.38 parameters as defined by ITU-T T.38 are related to a T.38 endpoint= implementation, such as the T.38 user plane interworking function as e.g. = located in an H.248 IP-to-TDM media gateway (e.g. 3GPP IM-MGW). There are fundamentally two signaling options for such T.38 configurations: 1. SDP-based: using T.38 Annex D defined SDP elements embedded in H.248 d= escriptors 2. Property-based: using H.248.2, IP Fax package defined properties, such= as specified by clauses 10.1.3 to 10.1.7 Both H.248 signalling options are basically equivalent, - independent of SD= P- or Property-based signaling elements. The signaling elements relate to t= he T.38 endpoint, but NOT to any remote G3FE. [Note: the H.248 IP fax package version 1 (from 2005/2007) does not yet con= tain the latest T.38V4 (2010) parameter. But this aspect is irrelevant in t= his discussion due to the proposal in 3GPP for the SDP-based method.] Thus, all "T.38 SDP attributes" (in C3-121327) are related to gateway capabilitie= s (such as supported T.38 configurations by an IM-MGW implementation) (NOTE= : attached is T.38 Table B.1 for H.323 gateways, which again underlines the= relation to gateway capabilities). The MGC / MGCF may be either 1. aware of the supported T.38 configuration(s) by his associated MGs or 2. unaware. Awareness may be achieved via auditing or configuration management. Unawareness is basically possible, but may lead to inefficient or even inef= fective H.248 scenarios for T.38. Dependent on the amount of "supported T.38 configuration(s)" knowledge at M= GC level would be the content of the SIP-level SDP O/A procedures. Conclusions for C3-121327 (http://www.3gpp.org/ftp/tsg_ct/WG3_interworking_= ex-CN3/TSGC3_70_Chicago/Docs/C3-121327.zip): NOTEs 1 and 2 in Table X.3.1 are incorrect in my opinion. The text related to "remote CS FAX equipment" (term should be anyway replac= ed by term G3FE) should be just deleted. And there would be correspondent c= hanges at other tables. -Albrecht --_000_5F7BCCF5541B7444830A2288ABBEBC96218B57EDCDFRMRSSXCHMBSD_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

    With belo= w indicated changes, we recommended the default settings for those T.38 par= ameters, which is FALSE (i.e., 3GPP profiles would then recommend NO= T to use such T.38 configurations).

     

    Claus= e X.2 provides a RECOMMENDATION on T.38 configuration(s).=

    Clause X.3 the correspondent negotiation = procedures.

     <= /o:p>

    I think that the prescriptive= language between both clauses must be consistent (which isn’t yet en= tirely the case in my opinion).

    <= span lang=3DEN-US style=3D'font-size:10.0pt;font-family:"Courier New";color= :black'> 

    E.g., Tab= le X.3.1:

    =

    T38= FaxTranscodingJBIG

    Accept offer with value "FALSE" or parameter omitte= d. Otherwise reject offer (NOTE 3).

    Do not include parameter in the answer. (N= OTE 2)

     

    =F0  Instead of = “Otherwise reject offer (NOTE 3).” we should rather specify
    “Otherwise, offer SHOULD b= e rejected (NOTE x)” and

    NOTE x – This parameter is not recommended to use, but = there might be remote T.38 endpoints with support of that capability. In or= der to improve the probability of a final successful T.38 call, the remote = T.38 endpoint should be indicated not to use this T.38 capability (see ANSW= ER).

     

    A pure rejection of the OFFER would = immediately lead to an unsuccessful T. 38 call.

     

    /Albrecht

    &n= bsp;

    From: Belling, Thomas (NSN - DE/Munich) [mailto:thomas.belling@nsn.com= ]
    Sent: Freitag, 3. August 2012 10:46
    To: Schwarz, Alb= recht (Albrecht); 3GPP_TSG_CT_WG3@LIST.ETSI.ORG
    Subject: RE: H.24= 8-controlled T.38 configurations: SDP- vs Property-based H.248 signalling

     

    <= p class=3DMsoNormal>Dear Albrecht,

     

    my proposal is still not include FAX “transcoding” in= the 3GPP profile. Is that acceptable to you?

     

    Thomas

     

    From: ext Schwarz, Albrecht (Albrecht) [ma= ilto:albrecht.schwarz@alcatel-lucent.com]
    Sent: Friday, August 0= 3, 2012 10:25 AM
    To: Belling, Thomas (NSN - DE/Munich); 3GPP_TSG_= CT_WG3@LIST.ETSI.ORG
    Cc: megaco@ietf.org
    Subject: RE: H= .248-controlled T.38 configurations: SDP- vs Property-based H.248 signallin= g

     

    Hello Thomas,

    looks like that we are now on the same page, i.e.= if the T.38 endpoint (here IM-MGW) would support that capability, then it = could be also used in the negotiation of T.38 configurations with the remot= e T.38 endpoint.

    Hence= , the T.38 parameters are not related to remote G3FEs.

    There would be then following changes in y= our CRs, let’s take Table X.2.1 as example:

     

     

    T= able X.2.1: R= ecommended configuration for T.38 SDP attribute values.

    T38FaxVersion

    Version 2 or higher. (NOTE 1)

    T38MaxBitRate

    1= 4 400

    <= span lang=3DEN-GB>T38FaxFillBitRemoval

    FALSE = (NOTE 2)

    T38FaxTran= scodingMMR

    FALSE (NOTE 2)

    =

    T38FaxTranscodingJBIG

    FALSE (NOTE 2)

    T38FaxRateManagement

    'transferredTCF'<= o:p>

    T38FaxMaxBuffer

    1800

    =

    T38FaxMaxDatagram

    At least 150

    T= 38FaxMaxIFP

    40 (NOTE 3)

    T38FaxUdpEC

    't38UDP= Redundancy'

    T38FaxUdpEC= Depth

    		<= p class=3DTAL>Minred: 1; Maxred: 2 (NOTE 3)

    T38FaxUdpFECMaxSpan

    3 (NOTE 3)

    = T38ModemType

    't38G3FaxOnly' (NOTE 2, NOTE= 3)

    NOTE 1:&nb= sp;   With Version 4, default values for the SDP attributes apply= if the attributes are omitted. However, some values relate to capabilit= ies of the remote CS FAX equipment unknown to the MGCF.

    NOTE 2:    This v= alue relates to capabilities of the remote CS FAX equipment unknown to the = MGCF. The recommended value (which is also the default value in T.38 versio= n 4) is likely to be supported by FAX equipment in CS networks.<= /span>

    NOTE 3:    Only a= pplicable for T.38 version 4.

    =

    &nb= sp;

    Would you agree?

    Albrecht

     

     

    From: Belling, Thomas (NSN - DE/Munich) [mailto:thomas.belling@nsn.com] <= br>Sent: Donnerstag, 2. August 2012 11:03
    To: Schwarz, Alb= recht (Albrecht); 3GPP_TSG= _CT_WG3@LIST.ETSI.ORG
    Subject: RE: H.248-controlled T.38 conf= igurations: SDP- vs Property-based H.248 signalling

     

    Hello Albrecht,

     

    a gateway could support FAX “transcoding”, as I = like to call it, and then use those parameters. But as Kevin wrote, it is h= ighly unusual for MGW implementations to do so. In my view we should not bu= rden the MGW with such functionality and the benefit is also questionable, = in particular because Kevin believes the JBIG and NMR encoding are also rar= ely used by T.38 terminals. I was rather envisioning a reframing of T.30 at= the MGW. Reading your explanation that you support the default values I su= spect this is also what your MGW does (as mine). Also in the table B.1 you = attached those parameters are “optional”. So, depending on MGW = implementation, those could either be capabilities of the CS FAX equipment = (if a reframing is done at the MGW as I envision), or of the MGW (if the MG= W performs FAX “transcoding”).

     

    For the 3GPP profiles, we do not necesarrily includ= e any conceivable option but only options with a real benefit. I would pref= er not to include FAX “transcoding” for the reasons outlined ab= ove. Assuming that we only want to use the default value, it does not need = to be signalled to the MGW but can rather be a provisioned value. So I do n= ot see a need to propagate those parameters over the Mn interface.

     

    Perhaps the NOTES should be= phrased a bit clearer and include an explanation that only T.30 reframing = is included in the Mn profile and under this condition, those SDP attribute= s relate to capabilities of the CS FAX equipment.

     

    Thomas

     

     

     =

    From: 3GPP_TSG_CT_WG3 - Core Network and Terminals WG 3 [mailto:3GPP_TSG_CT_WG3@LIST.ETSI.ORG] <= b>On Behalf Of ext Schwarz, Albrecht (Albrecht)
    Sent: Thursda= y, August 02, 2012 10:05 AM
    To: 3GPP_TSG_CT_WG3@LIST.ETSI.ORG
    Subject: Re: H.= 248-controlled T.38 configurations: SDP- vs Property-based H.248 signalling=

     

    Hello Thomas,

     

    <= span lang=3DEN-US style=3D'font-size:10.0pt;font-family:"Courier New";color= :#993366'>I followed the SIP Forum FoIP thread, but I fail to see that conf= irmation towards remote G3FE.

    Actually it’s rather the opposite, see Kevin’s reply to= you:

     

    > (I did not find= any definition of MMR format apart from “Modified =

    > Modified Read” in= T.38. However on Annex VI of T.30, MMR is defined as

    > the T.6 encoding. This als= o matches explanations in Wikipedia)

    > 

    > *T38FaxTranscodingJBIG*: Indicates the abili= ty to convert to/from JBIG

    > to reduce bandwidth. This

    > 

    > is a boolean parameter (inclusion= =3D true, exclusion =3D false).

     

    <= span lang=3DEN-US>It is possible for a T.30<-&= gt;T.38 gateway to provide these behaviors= if desired, and the resulting T.38 bitstream would differ in some n= oticeable ways from the T.30 bitstream. However, based on discussions with = various knowledgeable parties during our previous work in this group, it ap= pears that it is highly unusual for a T.38 implementation (gateway or termi= nal) to actually perform any of these three functions.

     

     

    <= span lang=3DEN-US style=3D'font-size:10.0pt;font-family:Wingdings;color:#99= 3366'>=F0  it’s a = gateway capability!

    =F0  all your three refe= rred T.38 parameters are subject of the IM-MGW implementation!

    and ALU supports the recommended d= efault values by Table H.2/T.38 (which should be inline with your proposal)= .

     

    Hence, Kevin explicitly confirms th= is also as gateway capability!

     

    Regard= s,

    Albrecht=

     

     

     

    From: Belling, Thomas (NSN - DE/Munich) [<= a href=3D"mailto:thomas.belling@nsn.com">mailto:thomas.belling@nsn.com]=
    Sent: Mittwoch, 1. August 2012 16:46
    To: Schwarz, Alb= recht (Albrecht); 3GPP_TSG= _CT_WG3@LIST.ETSI.ORG
    Subject: RE: H.248-controlled T.38 conf= igurations: SDP- vs Property-based H.248 signalling

     

    Dear Albrecht,

    =  

    Thanks for your comments.

     

    with respect to T38FaxFillBitRemoval, T38FaxTranscodin= gMMR and T38FaxTranscodingJBIG SDP attributes, to which Notes 1 and 2 relat= e,  I had some discussions at the SIP forum FoIP mailing list as you s= uggested.

     

    And it wa= s confirmed that unless you do some “transcoding” of the payloa= d within T.38 at the MGW, those properties relate to the remote CS FAX endp= oint. However, people thought that not signaling those properties in H.248v= 4 might be OK, because the default values which then apply are likely to be= supported by any receiving CS endpoint. The only open issue where I did no= t yet receive any reply is whether any harm is done if the CS endpoint beha= ves differently when sending.

     

    Thomas

     

    <= o:p> 

    &n= bsp;

    From: 3GPP_TSG_CT_WG3 - Core Network and Terminals WG 3 [mailto:3GPP_TSG_CT_WG3@LIST.ETSI.ORG] On Behalf Of ext Schwarz, Albrecht (Albrecht)
    Sent: Wed= nesday, August 01, 2012 4:17 PM
    To:     3GPP_TSG_CT_WG3@LIST.ETSI.ORG
    Subject: H.= 248-controlled T.38 configurations: SDP- vs Property-based H.248 signalling=

     

    [Cc’d megaco list due to H.248.2]

     

    The T.38 parameters as defined by ITU-T T.38 are related to a = T.38 endpoint implementation, such as the T.38 user plane interwo= rking function as e.g. located in an H.248 IP-to-TDM media gateway (e.g= . 3GPP IM-MGW).

     

    There are fundamentally two signaling optio= ns for such T.38 configurations:

      <= li class=3DMsoNormal style=3D'color:#002060;mso-margin-top-alt:auto;mso-mar= gin-bottom-alt:auto;mso-list:l2 level1 lfo5'>SDP-based: using T.38 Annex D defined SDP= elements embedded in H.248 descriptors
    1. Property-based: using H.248.2, IP Fax package defined= properties, such as specified by clauses 10.1.3 to 10.1.7

     

    <= p class=3DMsoNormal>Both H.248 signalling options are basically equivalent, -= independent of SDP- or Property-based signaling elements. The signaling el= ements relate to the T.38 endpoint, but NOT to any remote G3FE.

    [Note: the H.248 IP fax package version 1 (f= rom 2005/2007) does not yet contain the latest T.38V4 (2010) parameter. But= this aspect is irrelevant in this discussion due to the proposal in 3GPP f= or the SDP-based method.]

     <= o:p>

    Thus,

    all “T.38 SDP attributes” (in C3-12132= 7) are related to gateway capabilities (such as supported T.38 configuratio= ns by an IM-MGW implementation) (NOTE: attached is T.38 Table B.1 for H.323= gateways, which again underlines the relation to gateway capabilities).<= /span>

    The MGC / MGCF may be either=

    1. aware of t= he supported T.38 configuration(s) by his associated MGs or
    2. unaware.

    Awareness may be achieved via auditing or configurati= on management.

    Unawareness is bas= ically possible, but may lead to inefficient or even ineffective H.248 scen= arios for T.38.

    Dependent on the = amount of “supported T.38 configuration(s)” knowledge at MGC le= vel would be the content of the SIP-level SDP O/A procedures.

    <= /div>

     

    NOTEs 1 and = 2 in Table X.3.1 are incorrect in my opinion.

    The text related to “remote CS FAX equipment̶= 1; (term should be anyway replaced by term G3FE) should be just deleted<= /b>. And there would be correspondent changes at other tables.

    =

     

    -Albrecht

    &= nbsp;

     

     

     = ;

    = --_000_5F7BCCF5541B7444830A2288ABBEBC96218B57EDCDFRMRSSXCHMBSD_-- From albrecht.schwarz@alcatel-lucent.com Fri Aug 3 07:44:37 2012 Return-Path: X-Original-To: megaco@ietfa.amsl.com Delivered-To: megaco@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 9D25921F8D9F for ; Fri, 3 Aug 2012 07:44:37 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -8.215 X-Spam-Level: X-Spam-Status: No, score=-8.215 tagged_above=-999 required=5 tests=[AWL=-0.367, BAYES_00=-2.599, HELO_EQ_FR=0.35, HTML_MESSAGE=0.001, J_CHICKENPOX_12=0.6, J_CHICKENPOX_13=0.6, RCVD_IN_DNSWL_HI=-8, SARE_OEM_S_DOL=1.2] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Ak5RGYGtnfAN for ; Fri, 3 Aug 2012 07:44:29 -0700 (PDT) Received: from smail5.alcatel.fr (smail5.alcatel.fr [64.208.49.27]) by ietfa.amsl.com (Postfix) with ESMTP id B89C421F8D5B for ; Fri, 3 Aug 2012 07:44:28 -0700 (PDT) Received: from FRMRSSXCHHUB02.dc-m.alcatel-lucent.com (FRMRSSXCHHUB02.dc-m.alcatel-lucent.com [135.120.45.62]) by smail5.alcatel.fr (8.14.3/8.14.3/ICT) with ESMTP id q73EiPt3014570 (version=TLSv1/SSLv3 cipher=RC4-MD5 bits=128 verify=NOT); Fri, 3 Aug 2012 16:44:26 +0200 Received: from FRMRSSXCHMBSD2.dc-m.alcatel-lucent.com ([135.120.45.50]) by FRMRSSXCHHUB02.dc-m.alcatel-lucent.com ([135.120.45.62]) with mapi; Fri, 3 Aug 2012 16:44:26 +0200 From: "Schwarz, Albrecht (Albrecht)" To: "Belling, Thomas (NSN - DE/Munich)" , "3GPP_TSG_CT_WG3@LIST.ETSI.ORG" <3GPP_TSG_CT_WG3@LIST.ETSI.ORG> Date: Fri, 3 Aug 2012 16:44:24 +0200 Thread-Topic: H.248-controlled T.38 configurations: SDP- vs Property-based H.248 signalling Thread-Index: Ac1v8E49b1tSLpBZR9mXWDAW6hDlcQAAov1QACSffzAAAfKnwAAwrdSQAAEGPRAAAF+FgAAIyTVAAAMoKPA= Message-ID: <5F7BCCF5541B7444830A2288ABBEBC96218B57EE91@FRMRSSXCHMBSD2.dc-m.alcatel-lucent.com> References: A<5F7BCCF5541B7444830A2288ABBEBC96218B57EB6C@FRMRSSXCHMBSD2.dc-m.alcatel-lucent.com> <1A8A7D59006A8240B27FF63C794CA57F01A3E46B@DEMUEXC014.nsn-intra.net> A<5F7BCCF5541B7444830A2288ABBEBC96218B57EC14@FRMRSSXCHMBSD2.dc-m.alcatel-lucent.com> <1A8A7D59006A8240B27FF63C794CA57F01A3E63F@DEMUEXC014.nsn-intra.net> <5F7BCCF5541B7444830A2288ABBEBC96218B57EDB5@FRMRSSXCHMBSD2.dc-m.alcatel-lucent.com> <1A8A7D59006A8240B27FF63C794CA57F01A3E962@DEMUEXC014.nsn-intra.net> A<5F7BCCF5541B7444830A2288ABBEBC96218B57EDCD@FRMRSSXCHMBSD2.dc-m.alcatel-lucent.com> <1A8A7D59006A8240B27FF63C794CA57F01A3EB1B@DEMUEXC014.nsn-intra.net> In-Reply-To: <1A8A7D59006A8240B27FF63C794CA57F01A3EB1B@DEMUEXC014.nsn-intra.net> Accept-Language: de-DE, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: acceptlanguage: de-DE, en-US Content-Type: multipart/alternative; boundary="_000_5F7BCCF5541B7444830A2288ABBEBC96218B57EE91FRMRSSXCHMBSD_" MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.69 on 155.132.188.13 X-Mailman-Approved-At: Fri, 03 Aug 2012 08:36:55 -0700 Cc: "megaco@ietf.org" Subject: Re: [Megaco] H.248-controlled T.38 configurations: SDP- vs Property-based H.248 signalling X-BeenThere: megaco@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Media Gateway Control List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 03 Aug 2012 14:44:37 -0000 --_000_5F7BCCF5541B7444830A2288ABBEBC96218B57EE91FRMRSSXCHMBSD_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Thomas, hm ... 1st We do not need any new terminology in 3GPP, thus "CS FAX equipment" mus= t be replaced with term "G3FE" (T.38, cl. 3.3). 2nd There is no need to consider remote G3FE capabilities in detail (concer= ning your referred parameters), however, with the exception of V.34-capable= G3FE or non-V.34-capable G3FE. Thus: 3rd We may only talk about "T.38 endpoints", - and there are two types "T.3= 8/G3" and "T.38/V.34G3", see T.38, cl. 3.4 and 3.5. =3D> In the 3GPP Mn H.248 profile, it is recommended not to use this T.38 endpoi= nt capability. When sent by the MGCF, this value would relate to a T.38 end= point with support of that capability. The recommended value (which is also= the default value in T.38 version 4) is likely to be supported by existing= T.38 endpoint implementations. /Albrecht From: Belling, Thomas (NSN - DE/Munich) [mailto:thomas.belling@nsn.com] Sent: Freitag, 3. August 2012 15:19 To: Schwarz, Albrecht (Albrecht); 3GPP_TSG_CT_WG3@LIST.ETSI.ORG Subject: RE: H.248-controlled T.38 configurations: SDP- vs Property-based H= .248 signalling Thanks Albrecht, I can accept your last proposal. For your previous suggested change, given that the 3GPP Profile will not su= pport FAX transcoding (it seems you agree) perhaps we should not entirely r= emove those notes from table x.2.1. I can accept your change to Note 1. For= Note 2, we could write: In the 3GPP Mn H.248 profile, the T.30 protocol layer embedded within T.38 = is not modified. When sent by the MGCF, this value thus relates to capabili= ties of the remote CS FAX equipment unknown to the MGCF. The recommended va= lue (which is also the default value in T.38 version 4) is likely to be sup= ported by FAX equipment in CS networks. Thomas From: 3GPP_TSG_CT_WG3 - Core Network and Terminals WG 3 [mailto:3GPP_TSG_CT= _WG3@LIST.ETSI.ORG] On Behalf Of ext Schwarz, Albrecht (Albrecht) Sent: Friday, August 03, 2012 11:10 AM To: 3GPP_TSG_CT_WG3@LIST.ETSI.ORG Subject: Re: H.248-controlled T.38 configurations: SDP- vs Property-based H= .248 signalling With below indicated changes, we recommended the default settings for those= T.38 parameters, which is FALSE (i.e., 3GPP profiles would then recommend = NOT to use such T.38 configurations). Clause X.2 provides a RECOMMENDATION on T.38 configuration(s). Clause X.3 the correspondent negotiation procedures. I think that the prescriptive language between both clauses must be consist= ent (which isn't yet entirely the case in my opinion). E.g., Table X.3.1: T38FaxTranscodingJBIG Accept offer with value "FALSE" or parameter omitted. Otherwise reject offe= r (NOTE 3). Do not include parameter in the answer. (NOTE 2) =F0 Instead of "Otherwise reject offer (NOTE 3)." we should rather specify "Otherwise, offer SHOULD be rejected (NOTE x)" and NOTE x - This parameter is not recommended to use, but there might be remot= e T.38 endpoints with support of that capability. In order to improve the p= robability of a final successful T.38 call, the remote T.38 endpoint should= be indicated not to use this T.38 capability (see ANSWER). A pure rejection of the OFFER would immediately lead to an unsuccessful T. = 38 call. /Albrecht From: Belling, Thomas (NSN - DE/Munich) [mailto:thomas.belling@nsn.com] Sent: Freitag, 3. August 2012 10:46 To: Schwarz, Albrecht (Albrecht); 3GPP_TSG_CT_WG3@LIST.ETSI.ORG Subject: RE: H.248-controlled T.38 configurations: SDP- vs Property-based H= .248 signalling Dear Albrecht, my proposal is still not include FAX "transcoding" in the 3GPP profile. Is = that acceptable to you? Thomas From: ext Schwarz, Albrecht (Albrecht) [mailto:albrecht.schwarz@alcatel-luc= ent.com] Sent: Friday, August 03, 2012 10:25 AM To: Belling, Thomas (NSN - DE/Munich); 3GPP_TSG_CT_WG3@LIST.ETSI.ORG Cc: megaco@ietf.org Subject: RE: H.248-controlled T.38 configurations: SDP- vs Property-based H= .248 signalling Hello Thomas, looks like that we are now on the same page, i.e. if the T.38 endpoint (her= e IM-MGW) would support that capability, then it could be also used in the = negotiation of T.38 configurations with the remote T.38 endpoint. Hence, the T.38 parameters are not related to remote G3FEs. There would be then following changes in your CRs, let's take Table X.2.1 a= s example: Table X.2.1: Recommended configuration for T.38 SDP attribute values. T38FaxVersion Version 2 or higher. (NOTE 1) T38MaxBitRate 14 400 T38FaxFillBitRemoval FALSE (NOTE 2) T38FaxTranscodingMMR FALSE (NOTE 2) T38FaxTranscodingJBIG FALSE (NOTE 2) T38FaxRateManagement 'transferredTCF' T38FaxMaxBuffer 1800 T38FaxMaxDatagram At least 150 T38FaxMaxIFP 40 (NOTE 3) T38FaxUdpEC 't38UDPRedundancy' T38FaxUdpECDepth Minred: 1; Maxred: 2 (NOTE 3) T38FaxUdpFECMaxSpan 3 (NOTE 3) T38ModemType 't38G3FaxOnly' (NOTE 2, NOTE 3) NOTE 1: With Version 4, default values for the SDP attributes apply if t= he attributes are omitted. However, some values relate to capabilities of t= he remote CS FAX equipment unknown to the MGCF. NOTE 2: This value relates to capabilities of the remote CS FAX equipmen= t unknown to the MGCF. The recommended value (which is also the default val= ue in T.38 version 4) is likely to be supported by FAX equipment in CS netw= orks. NOTE 3: Only applicable for T.38 version 4. Would you agree? Albrecht From: Belling, Thomas (NSN - DE/Munich) [mailto:thomas.belling@nsn.com] Sent: Donnerstag, 2. August 2012 11:03 To: Schwarz, Albrecht (Albrecht); 3GPP_TSG_CT_WG3@LIST.ETSI.ORG Subject: RE: H.248-controlled T.38 configurations: SDP- vs Property-based H= .248 signalling Hello Albrecht, a gateway could support FAX "transcoding", as I like to call it, and then u= se those parameters. But as Kevin wrote, it is highly unusual for MGW imple= mentations to do so. In my view we should not burden the MGW with such func= tionality and the benefit is also questionable, in particular because Kevin= believes the JBIG and NMR encoding are also rarely used by T.38 terminals.= I was rather envisioning a reframing of T.30 at the MGW. Reading your expl= anation that you support the default values I suspect this is also what you= r MGW does (as mine). Also in the table B.1 you attached those parameters a= re "optional". So, depending on MGW implementation, those could either be c= apabilities of the CS FAX equipment (if a reframing is done at the MGW as I= envision), or of the MGW (if the MGW performs FAX "transcoding"). For the 3GPP profiles, we do not necesarrily include any conceivable option= but only options with a real benefit. I would prefer not to include FAX "t= ranscoding" for the reasons outlined above. Assuming that we only want to u= se the default value, it does not need to be signalled to the MGW but can r= ather be a provisioned value. So I do not see a need to propagate those par= ameters over the Mn interface. Perhaps the NOTES should be phrased a bit clearer and include an explanatio= n that only T.30 reframing is included in the Mn profile and under this con= dition, those SDP attributes relate to capabilities of the CS FAX equipment= . Thomas From: 3GPP_TSG_CT_WG3 - Core Network and Terminals WG 3 [mailto:3GPP_TSG_CT= _WG3@LIST.ETSI.ORG] On Behalf Of ext Schwarz, Albrecht (Albrecht) Sent: Thursday, August 02, 2012 10:05 AM To: 3GPP_TSG_CT_WG3@LIST.ETSI.ORG Subject: Re: H.248-controlled T.38 configurations: SDP- vs Property-based H= .248 signalling Hello Thomas, I followed the SIP Forum FoIP thread, but I fail to see that confirmation t= owards remote G3FE. Actually it's rather the opposite, see Kevin's reply to you: > (I did not find any definition of MMR format apart from "Modified > Modified Read" in T.38. However on Annex VI of T.30, MMR is defined as > the T.6 encoding. This also matches explanations in Wikipedia) > > *T38FaxTranscodingJBIG*: Indicates the ability to convert to/from JBIG > to reduce bandwidth. This > > is a boolean parameter (inclusion =3D true, exclusion =3D false). It is possible for a T.30<->T.38 gateway to provide these behaviors if desi= red, and the resulting T.38 bitstream would differ in some noticeable ways = from the T.30 bitstream. However, based on discussions with various knowled= geable parties during our previous work in this group, it appears that it i= s highly unusual for a T.38 implementation (gateway or terminal) to actuall= y perform any of these three functions. =F0 it's a gateway capability! =F0 all your three referred T.38 parameters are subject of the IM-MGW impl= ementation! and ALU supports the recommended default values by Table H.2/T.38 (which sh= ould be inline with your proposal). Hence, Kevin explicitly confirms this also as gateway capability! Regards, Albrecht From: Belling, Thomas (NSN - DE/Munich) [mailto:thomas.belling@nsn.com] Sent: Mittwoch, 1. August 2012 16:46 To: Schwarz, Albrecht (Albrecht); 3GPP_TSG_CT_WG3@LIST.ETSI.ORG Subject: RE: H.248-controlled T.38 configurations: SDP- vs Property-based H= .248 signalling Dear Albrecht, Thanks for your comments. with respect to T38FaxFillBitRemoval, T38FaxTranscodingMMR and T38FaxTransc= odingJBIG SDP attributes, to which Notes 1 and 2 relate, I had some discus= sions at the SIP forum FoIP mailing list as you suggested. And it was confirmed that unless you do some "transcoding" of the payload w= ithin T.38 at the MGW, those properties relate to the remote CS FAX endpoin= t. However, people thought that not signaling those properties in H.248v4 m= ight be OK, because the default values which then apply are likely to be su= pported by any receiving CS endpoint. The only open issue where I did not y= et receive any reply is whether any harm is done if the CS endpoint behaves= differently when sending. Thomas From: 3GPP_TSG_CT_WG3 - Core Network and Terminals WG 3 [mailto:3GPP_TSG_CT= _WG3@LIST.ETSI.ORG] On Behalf Of ext Schwarz, Albrecht (Albrecht) Sent: Wednesday, August 01, 2012 4:17 PM To: 3GPP_TSG_CT_WG3@LIST.ETSI.ORG Subject: H.248-controlled T.38 configurations: SDP- vs Property-based H.248= signalling [Cc'd megaco list due to H.248.2] The T.38 parameters as defined by ITU-T T.38 are related to a T.38 endpoint= implementation, such as the T.38 user plane interworking function as e.g. = located in an H.248 IP-to-TDM media gateway (e.g. 3GPP IM-MGW). There are fundamentally two signaling options for such T.38 configurations: 1. SDP-based: using T.38 Annex D defined SDP elements embedded in H.248 d= escriptors 2. Property-based: using H.248.2, IP Fax package defined properties, such= as specified by clauses 10.1.3 to 10.1.7 Both H.248 signalling options are basically equivalent, - independent of SD= P- or Property-based signaling elements. The signaling elements relate to t= he T.38 endpoint, but NOT to any remote G3FE. [Note: the H.248 IP fax package version 1 (from 2005/2007) does not yet con= tain the latest T.38V4 (2010) parameter. But this aspect is irrelevant in t= his discussion due to the proposal in 3GPP for the SDP-based method.] Thus, all "T.38 SDP attributes" (in C3-121327) are related to gateway capabilitie= s (such as supported T.38 configurations by an IM-MGW implementation) (NOTE= : attached is T.38 Table B.1 for H.323 gateways, which again underlines the= relation to gateway capabilities). The MGC / MGCF may be either 1. aware of the supported T.38 configuration(s) by his associated MGs or 2. unaware. Awareness may be achieved via auditing or configuration management. Unawareness is basically possible, but may lead to inefficient or even inef= fective H.248 scenarios for T.38. Dependent on the amount of "supported T.38 configuration(s)" knowledge at M= GC level would be the content of the SIP-level SDP O/A procedures. Conclusions for C3-121327 (http://www.3gpp.org/ftp/tsg_ct/WG3_interworking_= ex-CN3/TSGC3_70_Chicago/Docs/C3-121327.zip): NOTEs 1 and 2 in Table X.3.1 are incorrect in my opinion. The text related to "remote CS FAX equipment" (term should be anyway replac= ed by term G3FE) should be just deleted. And there would be correspondent c= hanges at other tables. -Albrecht --_000_5F7BCCF5541B7444830A2288ABBEBC96218B57EE91FRMRSSXCHMBSD_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

    Thomas, hm …

     

    1st We do not need any new terminology i= n 3GPP, thus “CS FAX equipment” must be replaced with term R= 20;G3FE” (T.38, cl. 3.3).

    <= span lang=3DEN-US style=3D'font-size:10.0pt;font-family:"Courier New";color= :#C00000'> 

    2nd There is no need to consider remote G3FE capabilities in detail (= concerning your referred parameters), however, with the exception of V.34-c= apable G3FE or non-V.34-capable G3FE.

     

    Thus:

    3rd We may only talk about “T.38 endpoints”, - and there are two = types “T.38/G3” and “T.38/V.34G3”, see T.38, cl. 3.= 4 and 3.5.

     =

    =3D><= /p>

    In the 3GPP Mn H.248 profile, it is recommend= ed not to use this T.38 endpoint capability. When sent by the MGCF, this va= lue would relate to a T.38 endpoint with support of that capability. The re= commended value (which is also the default value in T.38 version 4) is like= ly to be supported by existing T.38 endpoint implementations.

     

     

    <= span lang=3DEN-US style=3D'font-size:10.0pt;font-family:"Courier New";color= :#C00000'>/Albrecht

     

    From:= Belling, Thomas (NSN - DE/Munich) [mailto:thomas.belling@n= sn.com]
    Sent: Freitag, 3. August 2012 15:19
    To: Schwar= z, Albrecht (Albrecht); 3GPP_TSG_CT_WG3@LIST.ETSI.ORG
    Subject: RE= : H.248-controlled T.38 configurations: SDP- vs Property-based H.248 signal= ling

     

    Thanks Albrecht,

     <= /p>

    I can accept your last proposal= .

     =

    For your previous= suggested change, given that the 3GPP Profile will not support FAX transco= ding (it seems you agree) perhaps we should not entirely remove those notes= from table x.2.1. I can accept your change to Note 1. For Note 2, we could= write:

     

    In the 3GPP Mn H.248 pro= file, the T.30 protocol layer embedded within T.38 is not modified. When se= nt by the MGCF, this value thus relates to capabilities of the remote CS FA= X equipment unknown to the MGCF. The recommended value (which is also the d= efault value in T.38 version 4) is likely to be supported by FAX equipment = in CS networks.

     =

    Thomas=

     

     

     

    From: 3GPP_TSG_CT_WG3 - Core Network= and Terminals WG 3 [mailto:3GPP_TSG_CT_WG3@LIST.ETSI.ORG] On Behalf Of = ext Schwarz, Albrecht (Albrecht)
    Sent: Friday, August 03, 201= 2 11:10 AM
    To: 3GPP_TSG_CT_WG3@LIST.ETSI.ORG
    Subject: R= e: H.248-controlled T.38 configurations: SDP- vs Property-based H.248 signa= lling

     

    With below indicated changes, we recomm= ended the default settings for those T.38 parameters, which is FALSE (i.e.,= 3GPP profiles would then recommend NOT to use such T.38 configurati= ons).

     <= /span>

    Clause X.2 provides a RECOMMENDATIO= N on T.38 configuration(s).

    Clause X.3 the correspondent negotiation procedures.<= /p>

     

    I think that the prescriptive language between both clauses= must be consistent (which isn’t yet entirely the case in my opinion)= .

     

    E.g., Table X.3.1:

    T38FaxTranscodingJBIG=

    Accept offe= r with value "FALSE" or parameter omitted. Otherwise rejec= t offer (NOTE 3).

    Do not include parameter in the answer. (NOTE 2)=

     

    =F0 = Instead of “Otherwise reject offer (NOTE 3).” we shou= ld rather specify
    “Otherwise, offer SHOULD be rejected (NOTE x)&#= 8221; and

    NOTE x = – This parameter is not recommended to use, but there might be remote= T.38 endpoints with support of that capability. In order to improve the pr= obability of a final successful T.38 call, the remote T.38 endpoint should = be indicated not to use this T.38 capability (see ANSWER).

     

    A pure rejection of the OFFER would immediately lead to a= n unsuccessful T. 38 call.

     

    /Albrecht=

     

    =

    From: Belling, T= homas (NSN - DE/Munich) [mailto:t= homas.belling@nsn.com]
    Sent: Freitag, 3. August 2012 10:46To: Schwarz, Albrecht (Albrecht); 3GPP_TSG_CT_WG3@LIST.ETSI.ORG
    Subject: RE: H= .248-controlled T.38 configurations: SDP- vs Property-based H.248 signallin= g

     

    Dear Albrecht,

     

    my proposal is still not include FAX “transcoding”= ; in the 3GPP profile. Is that acceptable to you?

     

    Thomas

     

    From: ext Schwarz, Albrecht (Albrech= t) [mailto:albrecht.= schwarz@alcatel-lucent.com]
    Sent: Friday, August 03, 2012 10= :25 AM
    To: Belling, Thomas (NSN - DE/Munich); 3GPP_TSG_CT_WG3@LIST.ETSI.ORG
    Cc: megaco@ietf.org
    Subject: RE: H.248-controlled T.38 configurations: SDP- vs Property-based H.248 si= gnalling

     <= /o:p>

    Hello Thomas,

    looks like that we are now on the same pag= e, i.e. if the T.38 endpoint (here IM-MGW) would support that capability, t= hen it could be also used in the negotiation of T.38 configurations with th= e remote T.38 endpoint.

    There would be then following chang= es in your CRs, let’s take Table X.2.1 as example:<= /p>

     

     

    Table X= .2.1: Recommended configuration for T.38 SDP attribute values.

    = <= td width=3D285 valign=3Dtop style=3D'width:213.4pt;border-top:none;border-l= eft:solid windowtext 1.5pt;border-bottom:solid windowtext 1.0pt;border-righ= t:solid windowtext 1.0pt;padding:0cm 5.4pt 0cm 5.4pt'>

    T38FaxRateManagement

    <= td width=3D354 valign=3Dtop style=3D'width:265.45pt;border-top:none;border-= left:none;border-bottom:solid windowtext 1.0pt;border-right:solid windowtex= t 1.5pt;padding:0cm 5.4pt 0cm 5.4pt'>

    't38= UDPRedundancy'

    T38FaxVersion

    		Version 2 or higher. (NOTE 1)

    14 400

    T38FaxFillBitRemoval

    FAL= SE (NOTE 2)

    T38F= axTranscodingMMR

    FALSE (NOTE 2)

    T38FaxTranscodingJBIG=

    FALSE (NOTE 2)

    'transferre= dTCF'

    T38FaxMaxBuffer

    1800

    T38FaxMaxDatagram

    At least 150

    T38FaxMaxIFP

    40 (NOTE 3)

    T38FaxUdpEC

    T38FaxUd= pECDepth

    Minred: 1; Maxred: 2 (NOTE 3)

    T38FaxUdpFECMaxSpan=

    3 (NOTE 3)

    T38ModemType

    't38G3FaxOnly' (NOTE 2,= NOTE 3)

    NOTE 1:=     With Version 4, default values for the SDP attributes ap= ply if the attributes are omitted. However, some values relate to capabi= lities of the remote CS FAX equipment unknown to the MGCF.

    NOTE 2:    Thi= s value relates to capabilities of the remote CS FAX equipment unknown to t= he MGCF. The recommended value (which is also the default value in T.38 ver= sion 4) is likely to be supported by FAX equipment in CS networks.

    NOTE 3:    Onl= y applicable for T.38 version 4.

    =  

    Would you agree?

    Albrecht

     

     

    From: Belling, Thomas (NSN - DE/Munich= ) [mailto:thomas.belling@nsn.com<= /a>]
    Sent: Donnerstag, 2. August 2012 11:03
    To: Schwar= z, Albrecht (Albrecht);     3G= PP_TSG_CT_WG3@LIST.ETSI.ORG
    Subject: RE: H.248-controlled T.3= 8 configurations: SDP- vs Property-based H.248 signalling    =

     

    Hello Albrecht,

     

    a gateway could support FAX “transcoding”,= as I like to call it, and then use those parameters. But as Kevin wrote, i= t is highly unusual for MGW implementations to do so. In my view we should = not burden the MGW with such functionality and the benefit is also question= able, in particular because Kevin believes the JBIG and NMR encoding are al= so rarely used by T.38 terminals. I was rather envisioning a reframing of T= .30 at the MGW. Reading your explanation that you support the default value= s I suspect this is also what your MGW does (as mine). Also in the table B.= 1 you attached those parameters are “optional”. So, depending o= n MGW implementation, those could either be capabilities of the CS FAX equi= pment (if a reframing is done at the MGW as I envision), or of the MGW (if = the MGW performs FAX “transcoding”).

     

    For the 3GPP profiles, we do not necesarrily = include any conceivable option but only options with a real benefit. I woul= d prefer not to include FAX “transcoding” for the reasons outli= ned above. Assuming that we only want to use the default value, it does not= need to be signalled to the MGW but can rather be a provisioned value. So = I do not see a need to propagate those parameters over the Mn interface.

     

    Perhaps the NOTES sho= uld be phrased a bit clearer and include an explanation that only T.30 refr= aming is included in the Mn profile and under this condition, those SDP att= ributes relate to capabilities of the CS FAX equipment.

     

    Thomas

     

     

     

    From: 3GPP_TSG_CT_WG3 - Core Network and Terminals WG 3 [mailto:3GPP_TSG_CT_WG3@LIST.ETSI.ORG= ] On Behalf Of ext Schwarz, Albrecht (Albrecht)
    Sent: = Thursday, August 02, 2012 10:05 AM
    To: 3GPP_TSG_CT_WG3@LIST.ETSI.ORG
    Subject:= Re: H.248-controlled T.38 configurations: SDP- vs Property-based H.248 sig= nalling

     

    Hello Thomas,

    =

     

    Actually it’s rather the opposite, see Kevin’s r= eply to you:

    &nbs= p;

    > (I did n= ot find any definition of MMR format apart from “Modified =

    > Modified Read= 221; in T.38. However on Annex VI of T.30, MMR is defined as

    > the T.6 encoding. T= his also matches explanations in Wikipedia)

    > 

    > *T38FaxTranscodingJBIG*: Indicates = the ability to convert to/from JBIG

    > to reduce bandwidth. This<= /p>

    > <= /p>

    > is a boolean parameter (= inclusion =3D true, exclusion =3D false).

     

    It is possible for a T= .30<->T.38 gateway to provide these = behaviors if desired, and the resulting T.38 bitstream would differ = in some noticeable ways from the T.30 bitstream. However, based on discussi= ons with various knowledgeable parties during our previous work in this gro= up, it appears that it is highly unusual for a T.38 implementation (gateway= or terminal) to actually perform any of these three functions.<= /span>

     

     

    =F0  itR= 17;s a gateway capability!

    =F0  all your thre= e referred T.38 parameters are subject of the IM-MGW implementation!

    and ALU supports the recomme= nded default values by Table H.2/T.38 (which should be inline with your pro= posal).

     

    Hence, Kevin explicitly conf= irms this also as gateway capability!

     

    Regards,

    Albrecht

     

     

     =

     

    <= p class=3DMsoNormal>From: Belling, Thomas (NSN - DE= /Munich) [mailto:thomas.belling@n= sn.com]
    Sent: Mittwoch, 1. August 2012 16:46
    To: S= chwarz, Albrecht (Albrecht); 3GPP_TSG_CT_WG3@LIST.ETSI.ORG
    Subject: RE: H.248-controlle= d T.38 configurations: SDP- vs Property-based H.248 signalling

     

    Dear Albrecht,

     

    Thanks for your comments.

    <= p class=3DMsoNormal> 

    with respect to T38FaxFillBitRemoval, T38= FaxTranscodingMMR and T38FaxTranscodingJBIG SDP attributes, to which Notes = 1 and 2 relate,  I had some discussions at the SIP forum FoIP mailing = list as you suggested.

     

    And it was confirmed that unless you do some “transcoding” = of the payload within T.38 at the MGW, those properties relate to the remot= e CS FAX endpoint. However, people thought that not signaling those propert= ies in H.248v4 might be OK, because the default values which then apply are= likely to be supported by any receiving CS endpoint. The only open issue w= here I did not yet receive any reply is whether any harm is done if the CS = endpoint behaves differently when sending.

     

    Thomas

     

     

     

    From: 3GPP_TSG_CT_WG3 - Core Network and Terminals WG 3 [= mailto:3GPP_TSG_CT_WG3@LIS= T.ETSI.ORG] On Behalf Of ext Schwarz, Albrecht (Albrecht)
    = Sent: Wednesday, August 01, 2012 4:17 PM
    To: 3GPP_TSG_CT_WG3@LIST.ETSI.ORG
    Su= bject: H.248-controlled T.38 configurations: SDP- vs Property-based H.2= 48 signalling

    &n= bsp;

    [Cc’d megaco list due to H.248.= 2]

     

    =

    The T.38 parameters as defined by ITU-T T.38 are = related to a T.38 endpoint implementation, such as the T.38 user = plane interworking function as e.g. located in an H.248 IP-to-TDM media= gateway (e.g. 3GPP IM-MGW).

    &nbs= p;

    There are fundamentally two si= gnaling options for such T.38 configurations:

    1. SDP-based: using T.38 Annex D= defined SDP elements embedded in H.248 descriptors
    2. Property-based: using H.248.2, IP Fax pac= kage defined properties, such as specified by clauses 10.1.3 to 10.1.7<= o:p>

     =

    Both H.248 signalling options are basical= ly equivalent, - independent of SDP- or Property-based signaling elements. = The signaling elements relate to the T.38 endpoint, but NOT to any remote G= 3FE.=

    [Note: the H.248 IP fax pack= age version 1 (from 2005/2007) does not yet contain the latest T.38V4 (2010= ) parameter. But this aspect is irrelevant in this discussion due to the pr= oposal in 3GPP for the SDP-based method.]

     

    Thus,<= /span>

    all “T.38 SDP attributes= 221; (in C3-121327) are related to gateway capabilities (such as supported = T.38 configurations by an IM-MGW implementation) (NOTE: attached is T.38 Ta= ble B.1 for H.323 gateways, which again underlines the relation to gateway = capabilities).

    The MGC / MGCF may= be either

    1. aware of the supported T.38 configuration(s) by his associated MGs = or
    2. unaware.=

    Awareness may be achieved via audi= ting or configuration management.

    Unawareness is basically possible, but may lead to inefficient or even ine= ffective H.248 scenarios for T.38.

     

    NOTEs 1 and 2 in Table X.3.1 are incorrect in my opinion.

    The text related to “remote CS= FAX equipment” (term should be anyway replaced by term G3FE) should = be just deleted. And there would be correspondent changes at other t= ables.

     

    -Albrecht

     

     =

     

     

    = --_000_5F7BCCF5541B7444830A2288ABBEBC96218B57EE91FRMRSSXCHMBSD_-- From tom.taylor.stds@gmail.com Fri Aug 3 08:41:22 2012 Return-Path: X-Original-To: megaco@ietfa.amsl.com Delivered-To: megaco@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 3F52C21F8D3C for ; Fri, 3 Aug 2012 08:41:22 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -3.599 X-Spam-Level: X-Spam-Status: No, score=-3.599 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, RCVD_IN_DNSWL_LOW=-1] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id v48wITTkK1Dt for ; Fri, 3 Aug 2012 08:41:21 -0700 (PDT) Received: from mail-qa0-f44.google.com (mail-qa0-f44.google.com [209.85.216.44]) by ietfa.amsl.com (Postfix) with ESMTP id 8B71621F8D36 for ; Fri, 3 Aug 2012 08:41:21 -0700 (PDT) Received: by qadz3 with SMTP id z3so4235755qad.10 for ; Fri, 03 Aug 2012 08:41:21 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=message-id:date:from:user-agent:mime-version:to:subject:references :in-reply-to:content-type:content-transfer-encoding; bh=GsgLSol1ZbGz7OfvERVxAMLV6DPGfdf2rx9CnhHriQw=; b=b60SzLvIUyt7eqOcfC28RHWSezuAn4ggNY2VCysT6eodv6d14ODTHGG+Hhd8BbvdRB kjdhZGiPI6cWxhzIA4z9SDy/AgI2NeHcm8vOarVeuhPumdpElfK/qIu4RtGcHKBp1x2C +moaK4jNeMWTAt5Cn4l9wm3bBt8LUVuPgxzYfJ+0v13+jj+FHjb4xTSewc4TyZtS4AO/ rVnzbIFVLnps89WMDNmpYBXg9+T40ES7N7mENU0Vn7x0n4Vn9SsS473HCz0yaAmku1vM EjXODPrwftvoS0dNPUwD4ilXNT3FfZ4Lv1m02wkPKfhqVGZFUm+7W0hGRP5t5AZ+C9bK 1uTA== Received: by 10.60.20.197 with SMTP id p5mr5731267oee.32.1344008480981; Fri, 03 Aug 2012 08:41:20 -0700 (PDT) Received: from ?IPv6:2001:df8:0:32:94f1:abd9:208c:f621? ([2001:df8:0:32:94f1:abd9:208c:f621]) by mx.google.com with ESMTPS id k3sm3412953obw.4.2012.08.03.08.41.19 (version=SSLv3 cipher=OTHER); Fri, 03 Aug 2012 08:41:20 -0700 (PDT) Message-ID: <501BF11D.6000105@gmail.com> Date: Fri, 03 Aug 2012 08:41:17 -0700 From: Tom Taylor User-Agent: Mozilla/5.0 (X11; Linux i686; rv:14.0) Gecko/20120714 Thunderbird/14.0 MIME-Version: 1.0 To: megaco@ietf.org References: A<5F7BCCF5541B7444830A2288ABBEBC96218B57EB6C@FRMRSSXCHMBSD2.dc-m.alcatel-lucent.com> <1A8A7D59006A8240B27FF63C794CA57F01A3E46B@DEMUEXC014.nsn-intra.net> A<5F7BCCF5541B7444830A2288ABBEBC96218B57EC14@FRMRSSXCHMBSD2.dc-m.alcatel-lucent.com> <1A8A7D59006A8240B27FF63C794CA57F01A3E63F@DEMUEXC014.nsn-intra.net> <5F7BCCF5541B7444830A2288ABBEBC96218B57EDB5@FRMRSSXCHMBSD2.dc-m.alcatel-lucent.com> <1A8A7D59006A8240B27FF63C794CA57F01A3E962@DEMUEXC014.nsn-intra.net> A<5F7BCCF5541B7444830A2288ABBEBC96218B57EDCD@FRMRSSXCHMBSD2.dc-m.alcatel-lucent.com> <1A8A7D59006A8240B27FF63C794CA57F01A3EB1B@DEMUEXC014.nsn-intra.net> <5F7BCCF5541B7444830A2288ABBEBC96218B57EE91@FRMRSSXCHMBSD2.dc-m.alcatel-lucent.com> In-Reply-To: <5F7BCCF5541B7444830A2288ABBEBC96218B57EE91@FRMRSSXCHMBSD2.dc-m.alcatel-lucent.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Subject: Re: [Megaco] H.248-controlled T.38 configurations: SDP- vs Property-based H.248 signalling X-BeenThere: megaco@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Media Gateway Control List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 03 Aug 2012 15:41:22 -0000 Albrecht in particular: I'm having to release your messages administratively because they are too large. Please: - delete older portions of your messages when you reply; - send messages in text only rather than text and HTML. Thanks, Tom Taylor From grigoris.beis@nsn.com Wed Aug 22 02:21:09 2012 Return-Path: X-Original-To: megaco@ietfa.amsl.com Delivered-To: megaco@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 2756121F8639 for ; Wed, 22 Aug 2012 02:21:09 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -5.998 X-Spam-Level: X-Spam-Status: No, score=-5.998 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, HTML_MESSAGE=0.001, J_CHICKENPOX_22=0.6, RCVD_IN_DNSWL_MED=-4] Received: from mail.ietf.org ([64.170.98.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id KuQGLCcGEIKe for ; Wed, 22 Aug 2012 02:21:08 -0700 (PDT) Received: from demumfd002.nsn-inter.net (demumfd002.nsn-inter.net [93.183.12.31]) by ietfa.amsl.com (Postfix) with ESMTP id 52BC621F8623 for ; Wed, 22 Aug 2012 02:21:06 -0700 (PDT) Received: from demuprx016.emea.nsn-intra.net ([10.150.129.55]) by demumfd002.nsn-inter.net (8.12.11.20060308/8.12.11) with ESMTP id q7M9L4xb006488 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK) for ; Wed, 22 Aug 2012 11:21:04 +0200 Received: from DEMUEXC047.nsn-intra.net ([10.159.32.93]) by demuprx016.emea.nsn-intra.net (8.12.11.20060308/8.12.11) with ESMTP id q7M9Kx8N011370 for ; Wed, 22 Aug 2012 11:21:04 +0200 Received: from DEMUEXC035.nsn-intra.net ([10.150.128.26]) by DEMUEXC047.nsn-intra.net with Microsoft SMTPSVC(6.0.3790.4675); Wed, 22 Aug 2012 11:20:59 +0200 X-MimeOLE: Produced By Microsoft Exchange V6.5 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----_=_NextPart_001_01CD8047.71614E41" Date: Wed, 22 Aug 2012 11:20:59 +0200 Message-ID: X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: Wildcard "$" in Add command changes Signal properties in physical termination Thread-Index: Ac2AR3EVJ3RR39XOTvKzlyjnvJ85Aw== From: "Beis, Grigoris (NSN - GR/Athens)" To: X-OriginalArrivalTime: 22 Aug 2012 09:20:59.0607 (UTC) FILETIME=[71556E70:01CD8047] X-purgate-type: clean X-purgate-Ad: Categorized by eleven eXpurgate (R) http://www.eleven.de X-purgate: clean X-purgate: This mail is considered clean (visit http://www.eleven.de for further information) X-purgate-size: 11448 X-purgate-ID: 151667::1345627265-00003184-8413A26F/0-0/0-0 Subject: [Megaco] Wildcard "$" in Add command changes Signal properties in physical termination X-BeenThere: megaco@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Media Gateway Control List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 22 Aug 2012 09:21:09 -0000 This is a multi-part message in MIME format. ------_=_NextPart_001_01CD8047.71614E41 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Hello all, I came across a strange scenario which I haven't been able to justify it from the H.248.1 document. We have an MGC-MG connection in a call waiting scenario where the MGC applies call-waiting tone to the MG in a physical termination via the following message: C =3D 1 { MF=3Dport_1{ SG { CG/CW } } }=20 The message is successfully ack'ed by the MG and the PSTN subscriber successfully hears the call-waiting tone. What will happen to the call-waiting tone if the MGC issues an Add command with wildcard "$" and ring-back tone application, like the one below? C =3D 1 { A=3D$ { M { O { MO=3DIN,NT/JIT=3D0 } , L { SDP } } , = SG{CG/RT} } }=20 [ As expected, the MG chooses an ephemeral termination in the subsequent Add Reply] Does H.248.1 state anywhere that if a signal is applied in a command that bears a wildcard "$" termination, , it will replace the last signal that was applied in the physical termination? We observed that upon sending the Add command, the call-waiting tone is deactivated! I would consider this behavior as a MG deficiency, but I would gladly like to hear your opinion, as well. Thank you, Greg ------_=_NextPart_001_01CD8047.71614E41 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Wildcard "$" in Add command changes Signal properties = in physical termination

    Hello = all,

    I came across a = strange scenario which I haven’t been able to justify it from the = H.248.1 = document.

    We have an MGC-MG connection in = a call waiting scenario where the MGC = applies call-waiting tone = to the MG = in a physical termination via the following = message: C =3D 1 { MF=3Dport_1{ SG { CG/CW } } }

    The message is = successfully ack’ed by the MG and the PSTN subscriber successfully hears = the = call-waiting tone. What will happen to the call-waiting tone if the MGC = issues an Add command with wildcard = “$” and ring-back tone application, like = the one = below?

    C =3D 1 {  A=3D$ { M { O { MO=3DIN,NT/JIT=3D0 } , L  { SDP } } ,  SG{CG/RT} } }

    [ As expected, the MG chooses an ephemeral = termination in = the subsequent Add Reply]

    Does H.248.1 state anywhere that if a = signal is = applied in a = command that = bears a wildcard “$” termination, , it will replace the last signal that was applied in the = physical termination?  We observed that upon sending the Add = command, the = call-waiting tone is deactivated! = I would consider this behavior as a MG = deficiency, = but I would gladly like to hear your opinion, as well.

    Thank = you,

    Greg

    ------_=_NextPart_001_01CD8047.71614E41-- From arindam.bhattacharjee@alcatel-lucent.com Wed Aug 22 07:06:53 2012 Return-Path: X-Original-To: megaco@ietfa.amsl.com Delivered-To: megaco@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 0E3A121F8617 for ; Wed, 22 Aug 2012 07:06:53 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -7.948 X-Spam-Level: X-Spam-Status: No, score=-7.948 tagged_above=-999 required=5 tests=[AWL=1.700, BAYES_00=-2.599, HELO_EQ_FR=0.35, HTML_MESSAGE=0.001, J_CHICKENPOX_22=0.6, RCVD_IN_DNSWL_HI=-8] Received: from mail.ietf.org ([64.170.98.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id gCokYCBQbBQx for ; Wed, 22 Aug 2012 07:06:51 -0700 (PDT) Received: from smail2.alcatel.fr (smail2.alcatel.fr [64.208.49.57]) by ietfa.amsl.com (Postfix) with ESMTP id 461D121F85A1 for ; Wed, 22 Aug 2012 07:06:51 -0700 (PDT) Received: from FRMRSSXCHHUB03.dc-m.alcatel-lucent.com (FRMRSSXCHHUB03.dc-m.alcatel-lucent.com [135.120.45.63]) by smail2.alcatel.fr (8.14.3/8.14.3/ICT) with ESMTP id q7ME6eQ2022269 (version=TLSv1/SSLv3 cipher=RC4-MD5 bits=128 verify=NOT); Wed, 22 Aug 2012 16:06:46 +0200 Received: from US70TWXCHHUB03.zam.alcatel-lucent.com (135.5.2.35) by FRMRSSXCHHUB03.dc-m.alcatel-lucent.com (135.120.45.63) with Microsoft SMTP Server (TLS) id 8.3.213.0; Wed, 22 Aug 2012 16:06:29 +0200 Received: from US70UWXCHMBA01.zam.alcatel-lucent.com ([169.254.7.231]) by US70TWXCHHUB03.zam.alcatel-lucent.com ([135.5.2.35]) with mapi id 14.02.0247.003; Wed, 22 Aug 2012 10:06:28 -0400 From: "Bhattacharjee, Arindam (Arindam)" To: "Beis, Grigoris (NSN - GR/Athens)" , "megaco@ietf.org" Thread-Topic: Wildcard "$" in Add command changes Signal properties in physical termination Thread-Index: Ac2AR3EVJ3RR39XOTvKzlyjnvJ85AwAJ2lmg Date: Wed, 22 Aug 2012 14:06:27 +0000 Message-ID: <7DE39EC55B99FC47A3DEB6179256D9910293BD@US70UWXCHMBA01.zam.alcatel-lucent.com> References: In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [135.5.27.17] Content-Type: multipart/alternative; boundary="_000_7DE39EC55B99FC47A3DEB6179256D9910293BDUS70UWXCHMBA01zam_" MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.69 on 155.132.188.80 Subject: Re: [Megaco] Wildcard "$" in Add command changes Signal properties in physical termination X-BeenThere: megaco@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Media Gateway Control List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 22 Aug 2012 14:06:53 -0000 --_000_7DE39EC55B99FC47A3DEB6179256D9910293BDUS70UWXCHMBA01zam_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Hi Greg, Your interpretation is correct. MG should not stop signal on physical termination in your case while adding= another termination in that context and should be able to play signals on = both terminations as instructed by MGC. -Arindam From: megaco-bounces@ietf.org [mailto:megaco-bounces@ietf.org] On Behalf Of= Beis, Grigoris (NSN - GR/Athens) Sent: Wednesday, August 22, 2012 5:21 AM To: megaco@ietf.org Subject: [Megaco] Wildcard "$" in Add command changes Signal properties in = physical termination Hello all, I came across a strange scenario which I haven't been able to justify it fr= om the H.248.1 document. We have an MGC-MG connection in a call waiting scenario where the MGC appli= es call-waiting tone to the MG in a physical termination via the following = message: C =3D 1 { MF=3Dport_1{ SG { CG/CW } } } The message is successfully ack'ed by the MG and the PSTN subscriber succes= sfully hears the call-waiting tone. What will happen to the call-waiting to= ne if the MGC issues an Add command with wildcard "$" and ring-back tone ap= plication, like the one below? C =3D 1 { A=3D$ { M { O { MO=3DIN,NT/JIT=3D0 } , L { SDP } } , SG{CG/RT}= } } [ As expected, the MG chooses an ephemeral termination in the subsequent Ad= d Reply] Does H.248.1 state anywhere that if a signal is applied in a command that b= ears a wildcard "$" termination, , it will replace the last signal that was= applied in the physical termination? We observed that upon sending the Ad= d command, the call-waiting tone is deactivated! I would consider this beha= vior as a MG deficiency, but I would gladly like to hear your opinion, as w= ell. Thank you, Greg --_000_7DE39EC55B99FC47A3DEB6179256D9910293BDUS70UWXCHMBA01zam_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Wildcard "$" in Add command changes Signal properties in p= hysical termination

    Hi Greg,

    Your interpretation is co= rrect.

    MG should not stop signal= on physical termination in your case while adding another termination in t= hat context and should be able to play signals on both terminations as instructed by MGC.

    -Arindam

     <= /p>

     <= /p>

    From: megaco-b= ounces@ietf.org [mailto:megaco-bounces@ietf.org] On Behalf Of Beis, Grigoris (NSN - GR/Athens)
    Sent: Wednesday, August 22, 2012 5:21 AM
    To: megaco@ietf.org
    Subject: [Megaco] Wildcard "$" in Add command changes Sign= al properties in physical termination

     

    H= ello all,

    I= came across a strange scenario which I haven’t been able to justify = it from the H.248.1 document.

    W= e have an MGC-MG connection in a call= waiting scenario where the MGC applies call-waiting tone to the MG in a physical termination via the following message: C =3D 1 { MF=3Dport_1{ SG { CG/CW } } }

    T= he message is successfully ack’ed by the MG and the PSTN subscriber s= uccessfully hears the call-waiting tone. What will happen to the call-waiti= ng tone if the MGC issues an Add command with wildcard R= 20;$” and ring-back tone application, like the one = below?

    C= =3D 1 {  A=3D$ { M { O { MO=3DIN,NT/JIT=3D0 } , L  { SDP } } ,  SG{CG/RT} } }

    [= As expected, the MG chooses an ephemeral termination in the subsequent Add = Reply]

    D= oes H.248.1 state anywhere that if a signal is applied in a command that= bears a wildcard “$” termination, , it will replace the last signal = that was applied in the physical termination?  We observed that upo= n sending the Add command, the call-waiting tone is deactivated! I would consider this behavior as a MG deficiency, but I would gladly li= ke to hear your opinion, as well= .

    T= hank you,

    G= reg

    --_000_7DE39EC55B99FC47A3DEB6179256D9910293BDUS70UWXCHMBA01zam_-- From grigoris.beis@nsn.com Wed Aug 22 07:20:13 2012 Return-Path: X-Original-To: megaco@ietfa.amsl.com Delivered-To: megaco@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id C5C9F21F85DA for ; Wed, 22 Aug 2012 07:20:13 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -5.998 X-Spam-Level: X-Spam-Status: No, score=-5.998 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, HTML_MESSAGE=0.001, J_CHICKENPOX_22=0.6, RCVD_IN_DNSWL_MED=-4] Received: from mail.ietf.org ([64.170.98.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 0TWn8Oayz3b3 for ; Wed, 22 Aug 2012 07:20:12 -0700 (PDT) Received: from demumfd001.nsn-inter.net (demumfd001.nsn-inter.net [93.183.12.32]) by ietfa.amsl.com (Postfix) with ESMTP id 70D8921F85C4 for ; Wed, 22 Aug 2012 07:20:11 -0700 (PDT) Received: from demuprx017.emea.nsn-intra.net ([10.150.129.56]) by demumfd001.nsn-inter.net (8.12.11.20060308/8.12.11) with ESMTP id q7MEK1Cb021184 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK); Wed, 22 Aug 2012 16:20:01 +0200 Received: from demuexc022.nsn-intra.net (demuexc022.nsn-intra.net [10.150.128.35]) by demuprx017.emea.nsn-intra.net (8.12.11.20060308/8.12.11) with ESMTP id q7MEJvVs015646; Wed, 22 Aug 2012 16:20:01 +0200 Received: from DEMUEXC035.nsn-intra.net ([10.150.128.26]) by demuexc022.nsn-intra.net with Microsoft SMTPSVC(6.0.3790.4675); Wed, 22 Aug 2012 16:19:36 +0200 X-MimeOLE: Produced By Microsoft Exchange V6.5 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----_=_NextPart_001_01CD8071.286787BA" Date: Wed, 22 Aug 2012 16:19:35 +0200 Message-ID: In-Reply-To: <7DE39EC55B99FC47A3DEB6179256D9910293BD@US70UWXCHMBA01.zam.alcatel-lucent.com> X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: Wildcard "$" in Add command changes Signal properties inphysical termination Thread-Index: Ac2AR3EVJ3RR39XOTvKzlyjnvJ85AwAJ2lmgAABpfRA= References: <7DE39EC55B99FC47A3DEB6179256D9910293BD@US70UWXCHMBA01.zam.alcatel-lucent.com> From: "Beis, Grigoris (NSN - GR/Athens)" To: "ext Bhattacharjee, Arindam (Arindam)" , X-OriginalArrivalTime: 22 Aug 2012 14:19:36.0726 (UTC) FILETIME=[28C4D360:01CD8071] X-purgate-type: clean X-purgate-Ad: Categorized by eleven eXpurgate (R) http://www.eleven.de X-purgate: clean X-purgate: This mail is considered clean (visit http://www.eleven.de for further information) X-purgate-size: 13820 X-purgate-ID: 151667::1345645202-00006F5F-BB70FCE4/0-0/0-0 Subject: Re: [Megaco] Wildcard "$" in Add command changes Signal properties inphysical termination X-BeenThere: megaco@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Media Gateway Control List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 22 Aug 2012 14:20:13 -0000 This is a multi-part message in MIME format. ------_=_NextPart_001_01CD8071.286787BA Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Hello Arindam, =20 Thanks for the confirmation. To my knowledge, "$" is simply another termination; either an ephemeral termination or another idle physical termination. Our physical termination, however, is not idle. It already occupies resources like the call-waiting tone. =20 Br, Greg =20 From: ext Bhattacharjee, Arindam (Arindam) [mailto:arindam.bhattacharjee@alcatel-lucent.com]=20 Sent: Wednesday, August 22, 2012 5:06 PM To: Beis, Grigoris (NSN - GR/Athens); megaco@ietf.org Subject: RE: Wildcard "$" in Add command changes Signal properties inphysical termination =20 Hi Greg, Your interpretation is correct. MG should not stop signal on physical termination in your case while adding another termination in that context and should be able to play signals on both terminations as instructed by MGC. -Arindam =20 =20 From: megaco-bounces@ietf.org [mailto:megaco-bounces@ietf.org] On Behalf Of Beis, Grigoris (NSN - GR/Athens) Sent: Wednesday, August 22, 2012 5:21 AM To: megaco@ietf.org Subject: [Megaco] Wildcard "$" in Add command changes Signal properties in physical termination =20 Hello all, I came across a strange scenario which I haven't been able to justify it from the H.248.1 document. We have an MGC-MG connection in a call waiting scenario where the MGC applies call-waiting tone to the MG in a physical termination via the following message: C =3D 1 { MF=3Dport_1{ SG { CG/CW } } }=20 The message is successfully ack'ed by the MG and the PSTN subscriber successfully hears the call-waiting tone. What will happen to the call-waiting tone if the MGC issues an Add command with wildcard "$" and ring-back tone application, like the one below? C =3D 1 { A=3D$ { M { O { MO=3DIN,NT/JIT=3D0 } , L { SDP } } , = SG{CG/RT} } }=20 [ As expected, the MG chooses an ephemeral termination in the subsequent Add Reply] Does H.248.1 state anywhere that if a signal is applied in a command that bears a wildcard "$" termination, , it will replace the last signal that was applied in the physical termination? We observed that upon sending the Add command, the call-waiting tone is deactivated! I would consider this behavior as a MG deficiency, but I would gladly like to hear your opinion, as well. Thank you, Greg ------_=_NextPart_001_01CD8071.286787BA Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Wildcard "$" in Add command changes = Signal properties in physical termination

    Hello Arindam,

     

    Thanks for the confirmation. To my knowledge, “$” is = simply another termination; either an ephemeral termination or another = idle physical termination. Our physical termination, however, is not = idle. It already occupies resources like the call-waiting = tone.

     

    Br,

    Greg

     

    From:= = ext Bhattacharjee, Arindam (Arindam) = [mailto:arindam.bhattacharjee@alcatel-lucent.com]
    Sent: = Wednesday, August 22, 2012 5:06 PM
    To: Beis, Grigoris (NSN - = GR/Athens); megaco@ietf.org
    Subject: RE: Wildcard = "$" in Add command changes Signal properties inphysical = termination

     

    Hi Greg,

    Your interpretation is correct.

    MG should not stop signal on physical termination in your case while = adding another termination in that context and should be able to play = signals on both terminations as instructed by = MGC.

    -Arindam

     

     

    From:= = megaco-bounces@ietf.org = [mailto:megaco-bounces@ietf.org] On Behalf Of Beis, Grigoris (NSN - GR/Athens)
    Sent: = Wednesday, August 22, 2012 5:21 AM
    To:     megaco@ietf.org
    Subject: = [Megaco] Wildcard "$" in Add command changes Signal properties = in physical termination

     

    Hello = all,

    I came across a strange = scenario which I haven’t been able to justify it from the H.248.1 = document.

    We have an MGC-MG = connection in a call waiting = scenario where = the MGC applies call-waiting tone to the MG in a physical termination via = the following message: C =3D 1 { MF=3Dport_1{ SG { CG/CW } } } =

    The = message is successfully ack’ed by the MG and the PSTN subscriber = successfully hears the call-waiting tone. What will happen to the = call-waiting tone if the MGC issues an Add command with wildcard = “$” and = ring-back tone application, like the one = below?

    C =3D 1 {  A=3D$ { M { O { MO=3DIN,NT/JIT=3D0 = } , L  { SDP } } ,  SG{CG/RT} } } =

    [ As expected, the MG chooses = an ephemeral termination in the subsequent Add = Reply]

    Does H.248.1 state anywhere that = if a signal is = applied in a = command that = bears a wildcard “$” = termination, , it will replace the last signal that was applied in the = physical termination?  We observed that upon = sending the Add command, the call-waiting tone is deactivated! = I would consider this = behavior as a MG deficiency, but I would gladly like to hear your = opinion, as well.

    <= p>Thank = you,

    Greg

    ------_=_NextPart_001_01CD8071.286787BA-- From chaim.geretz@idt.net Wed Aug 22 09:54:52 2012 Return-Path: X-Original-To: megaco@ietfa.amsl.com Delivered-To: megaco@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 167D721F85B4 for ; Wed, 22 Aug 2012 09:54:52 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -5.976 X-Spam-Level: X-Spam-Status: No, score=-5.976 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_MED=-4] Received: from mail.ietf.org ([64.170.98.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id w80rqdoVdzUy for ; Wed, 22 Aug 2012 09:54:51 -0700 (PDT) Received: from eu1sys200aog103.obsmtp.com (eu1sys200aog103.obsmtp.com [207.126.144.115]) by ietfa.amsl.com (Postfix) with SMTP id 07A7C21F85B1 for ; Wed, 22 Aug 2012 09:54:50 -0700 (PDT) Received: from mail-vc0-f180.google.com ([209.85.220.180]) (using TLSv1) by eu1sys200aob103.postini.com ([207.126.147.11]) with SMTP ID DSNKUDUO1mY43ySG9h4JkuH8QpbgSvxTVTkn@postini.com; Wed, 22 Aug 2012 16:54:51 UTC Received: by vcbfw7 with SMTP id fw7so1814335vcb.39 for ; Wed, 22 Aug 2012 09:54:46 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=mime-version:from:date:message-id:subject:to:content-type :x-gm-message-state; bh=LZKaC82j9nIzlbJYaqQ2M5dj+aFwrxGVtJLrzEyt4TA=; b=ai/hqFySXOKyJwnCTHuVw5gm2LHUPb+BEN9cgDoiSCn07wznLrjJJ1pegsVnKO6Ygk kkP4y77sdUkBeFqSkLaGdkXMSD7IMr1vjedGQhsmdyufUaPwxWAHTIihjxiX/9uNl+Tj IoWGyIDX8uorYl1HKmrwYWacFmwgIVt9S91PkMqyz4kqHPNcvJaOu3urz5N7WXAz6kw5 +cw7mX+2tsbS+IaImxmMNrUtCjt5xrqta6SQEHQKKwCmZ8+UPEHeDf1PjAvDYGt5Homa 7jAtS2V+9NDrQMsYl/6BpL0NlTHCH4VdNumzbB+BR3H9OPSC4X0YmgtTG8Q8snuh/lMe Llfg== Received: by 10.220.150.16 with SMTP id w16mr17109342vcv.65.1345654486035; Wed, 22 Aug 2012 09:54:46 -0700 (PDT) MIME-Version: 1.0 Received: by 10.58.226.137 with HTTP; Wed, 22 Aug 2012 09:54:25 -0700 (PDT) From: Chaim Geretz Date: Wed, 22 Aug 2012 12:54:25 -0400 Message-ID: To: "megaco@ietf.org" Content-Type: multipart/alternative; boundary=f46d04389095a16ce804c7dd99b9 X-Gm-Message-State: ALoCoQmwrMl+smx4Jj8Frszoq2V10zFaS8EsMDjjKVaXAA0IHHDluTrhfXySEX0zxM96kvcIhqVo X-Mailman-Approved-At: Thu, 23 Aug 2012 08:44:42 -0700 Subject: [Megaco] MEGACO version in ServiceChange Reply X-BeenThere: megaco@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Media Gateway Control List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 22 Aug 2012 17:05:40 -0000 --f46d04389095a16ce804c7dd99b9 Content-Type: text/plain; charset=ISO-8859-1 Hi, Assume MG sends a ServiceChange encoded as MEGACO/1 with VERSION=3 MGC supports offered version, how does it encode the response; as MEGACO/1 or MEGACO/3? I see the example in ITU H248.1 (09/2005) Appendix I showing a response of MEGACO/1 but I was unable to find this discussed anywhere else in the specification. Thank you Chaim Geretz --f46d04389095a16ce804c7dd99b9 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
    Hi,

    Assume MG sends a ServiceChange encoded a= s MEGACO/1 with VERSION=3D3

    MGC supports offered v= ersion, how does it encode the response; as MEGACO/1 or MEGACO/3? I see the= example in ITU H248.1 (09/2005) Appendix I showing a response of MEGACO/1 = but I was unable to find this discussed anywhere else in the specification.=

    Thank you

    Chaim Geretz



    --f46d04389095a16ce804c7dd99b9-- From Christian.Groves@nteczone.com Thu Aug 23 18:01:12 2012 Return-Path: X-Original-To: megaco@ietfa.amsl.com Delivered-To: megaco@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 907DF21E8034 for ; Thu, 23 Aug 2012 18:01:12 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.509 X-Spam-Level: X-Spam-Status: No, score=-2.509 tagged_above=-999 required=5 tests=[AWL=0.090, BAYES_00=-2.599] Received: from mail.ietf.org ([64.170.98.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id jmS1tMOFbq1l for ; Thu, 23 Aug 2012 18:01:12 -0700 (PDT) Received: from ipmail07.adl2.internode.on.net (ipmail07.adl2.internode.on.net [IPv6:2001:44b8:8060:ff02:300:1:2:7]) by ietfa.amsl.com (Postfix) with ESMTP id AA98D11E8099 for ; Thu, 23 Aug 2012 18:01:11 -0700 (PDT) X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: ApMBAMnRNlB20eoO/2dsb2JhbAANOIYBt3YBAQEEAQEBIBUbGwoBEAsYAgIFFgsCAgkDAgECARUwBg0BBQIBAYgUpXZukxMEgSGJZ4V/gRIDqF0 Received: from ppp118-209-234-14.lns20.mel6.internode.on.net (HELO [127.0.0.1]) ([118.209.234.14]) by ipmail07.adl2.internode.on.net with ESMTP; 24 Aug 2012 10:31:09 +0930 Message-ID: <5036D24F.4090706@nteczone.com> Date: Fri, 24 Aug 2012 11:01:03 +1000 From: Christian Groves User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:14.0) Gecko/20120713 Thunderbird/14.0 MIME-Version: 1.0 To: Chaim Geretz References: In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Cc: "megaco@ietf.org" Subject: Re: [Megaco] MEGACO version in ServiceChange Reply X-BeenThere: megaco@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Media Gateway Control List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 24 Aug 2012 01:01:12 -0000 Hello Chaim, Section 11.3 /H.248.1 discusses protocol version negotiation. However I think it is a little ambiguous in this regard. It does not say explicitly that you should use version 1 in the ServiceChange.reply. The text is below: *11.3 Negotiation of protocol version* /A ServiceChange Command from a MG that registers with an MGC shall contain the version number of the protocol supported by the MG in the ServiceChangeVersion parameter. Regardless of the version placed in the ServiceChangeVersion parameter, the message containing the command shall be encoded as a version 1 message. Upon receiving such a message, if the MGC supports only a lower version, then the MGC shall send a ServiceChange Reply with the lower version and, thereafter, all the messages between MG and MGC shall conform to the lower version of the protocol. If the MG is unable to comply, and it has established a transport connection to the MGC, it should close that connection. In any event, it should reject all subsequent requests from the MGC with Error Code 406 ("Version Not Supported"). / /If the MGC supports the version indicated by the MG, <<>>. In this case it is optional for the MGC to return a version in the ServiceChange Reply./ I think the confusion comes from "in all subsequent messages". It could be argued that the message containing the ServiceChange.Reply is a "subsequent" message. However I think the intention at the time was that the subsequent messages meant messages after the Servicechange.req/.reply was completed (i.e. the control associated is fully established). This is shown by the Appendix I. Also I don't think there is any other case where the version numbers associated with a message with Transaction.request and a message with a Transaction.reply change. Therefore I think the safest behaviour is to use version 1 encoding for the message containing the ServiceChange.Reply Regards, Christian On 23/08/2012 2:54 AM, Chaim Geretz wrote: > Hi, > > Assume MG sends a ServiceChange encoded as MEGACO/1 with VERSION=3 > > MGC supports offered version, how does it encode the response; as > MEGACO/1 or MEGACO/3? I see the example in ITU H248.1 (09/2005) > Appendix I showing a response of MEGACO/1 but I was unable to find > this discussed anywhere else in the specification. > > Thank you > > Chaim Geretz > > > > > > _______________________________________________ > Megaco mailing list > Megaco@ietf.org > https://www.ietf.org/mailman/listinfo/megaco From Abhijit.Dutta@radisys.com Thu Aug 30 00:00:26 2012 Return-Path: X-Original-To: megaco@ietfa.amsl.com Delivered-To: megaco@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 0E3ED11E80D2 for ; Thu, 30 Aug 2012 00:00:26 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -0.739 X-Spam-Level: X-Spam-Status: No, score=-0.739 tagged_above=-999 required=5 tests=[BAYES_20=-0.74, HTML_MESSAGE=0.001] Received: from mail.ietf.org ([64.170.98.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 3tbsMzbboz5t for ; Thu, 30 Aug 2012 00:00:24 -0700 (PDT) Received: from mail4.radisys.com (mail4.radisys.com [207.189.106.90]) by ietfa.amsl.com (Postfix) with ESMTP id DC16411E80A3 for ; Thu, 30 Aug 2012 00:00:23 -0700 (PDT) Received: from OREXCHANGE04.radisys.com ([fe80::ed67:8c6c:46af:961e]) by OREXCHANGE03.radisys.com ([fe80::79bb:611b:3499:8b0e%22]) with mapi id 14.02.0298.004; Thu, 30 Aug 2012 00:00:22 -0700 From: Abhijit Dutta To: "megaco@ietf.org" Thread-Topic: Digitmap Thread-Index: Ac2GeTvTiwCC2xTyTuS90L/5fOAXew== Date: Thu, 30 Aug 2012 07:00:22 +0000 Message-ID: <38519B6C2F9E794B82363B4C77EA57FF01356A6C@orexchange04.radisys.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: Content-Type: multipart/alternative; boundary="_000_38519B6C2F9E794B82363B4C77EA57FF01356A6Corexchange04rad_" MIME-Version: 1.0 Subject: [Megaco] Digitmap X-BeenThere: megaco@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Media Gateway Control List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 30 Aug 2012 07:00:26 -0000 --_000_38519B6C2F9E794B82363B4C77EA57FF01356A6Corexchange04rad_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Hi, As pre spec: "If the timer expires and a member of the candidate set of alternatives is = fully satisfied, a timeout completion with full match is reported. If the timer expires and part or none of any candidate alternative is sati= sfied, a timeout completion with partial match is reported. In either case, if the digit map completion event allows for detailed timeo= ut reporting, the reported dial string will end with 'L', 'S', or 'T' as ap= propriate" What we see is MG reports collected digit string but does not include "S" = event in cases where it appears the MG waited for the S timer to expire bef= ore reporting the Digitstring. Q: should MG be including the Termination method with Digitstring ? Q: in case of PM with empty digit string, should the Termination method be = included ? Q: in case of PM, does the MS report the partially collected digits? If Digitmap is xxxx and MS detects "123" and S timer expires waiting for 4t= h digit, which OBSERVEDEVENT should MS send: OBSERVEDEVENTS =3D 214 { 1:DD/CE { DS =3D "", METH =3D PM }, or OBSERVEDEVENTS =3D 214 { 1:DD/CE { DS =3D "123", METH =3D PM }, or OBSERVEDEVENTS =3D 214 { 1:DD/CE { DS =3D "123S", METH =3D PM } ~Thanx Abhijit --_000_38519B6C2F9E794B82363B4C77EA57FF01356A6Corexchange04rad_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

    Hi,

     

    As pre spec:

     

    “If the timer ex= pires and a member of the candidate set of alternatives is fully satisfied,= a timeout completion with full match is reported.

     If the timer exp= ires and part or none of any candidate alternative is satisfied, a  ti= meout completion with partial match is reported.

    In either case, if the= digit map completion event allows for detailed timeout reporting, the repo= rted dial string will end with 'L', 'S', or 'T' as appropriate"

     

     

    What we see is MG repo= rts collected digit string but does not include "S"  event i= n cases where it appears the MG waited for the S timer to expire before rep= orting the Digitstring.

     

    Q: should MG be including the Termination method wit= h Digitstring ?

    Q: in case of PM with empty digit string, should the= Termination method be included ?

    Q: in case of PM, does the MS report  the parti= ally collected digits?

     

    If Digitmap is xxxx and MS detects “123”= and S timer expires waiting for 4th digit, which OBSERVEDEVENT should MS s= end:

    OBSERVEDEVENTS =3D 2= 14 { 1:DD/CE { DS =3D "", METH =3D PM }, or

    OBSERVEDEVENTS =3D 2= 14 { 1:DD/CE { DS =3D "123", METH =3D PM }, or<= /p>

    OBSERVEDEVENTS =3D 2= 14 { 1:DD/CE { DS =3D "123S", METH =3D PM }

     

    ~Thanx

    Abhijit

    --_000_38519B6C2F9E794B82363B4C77EA57FF01356A6Corexchange04rad_--