
From mary.barnes@nortel.com  Wed Apr  1 10:40:53 2009
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References: <9520E66537CC4941994C518E3E21091CC4BB3F@esealmw105.eemea.ericsson.se> <20090331132746.zyooov5hb4kcg0o0@webmail.unina.it>
From: "Mary Barnes" <mary.barnes@nortel.com>
To: <spromano@unina.it>, "Oscar Novo" <oscar.novo@ericsson.com>
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 I also think your proposal is fine. I had originally thought we'd want =
to know in the case where the parent was cloned and labeled =
"independent". But, really once we clone and don't make it dependent on =
the changes to the parent, it really doesn't matter that it was =
originally created by cloning.=20

Thanks,
Mary.=20

-----Original Message-----
From: spromano@unina.it [mailto:spromano@unina.it]=20
Sent: Tuesday, March 31, 2009 6:28 AM
To: Oscar Novo
Cc: xcon@ietf.org; Barnes, Mary (RICH2:AR00)
Subject: Re: Additional Data in the Data Model

I'm ok with the proposed modifications.

Cheers,

Simon

Quoting Oscar Novo <oscar.novo@ericsson.com>:

> Hi guys!
>
> As per discussion in this mailing list and in the last IETF-74=20
> meeting, the authors of the data model are proposing to add the=20
> following elements to the data model to explicit express cloning in =
the document.
> The elements we're planning to add are:
>
> - cloning-parent: When this element is present, it indicates that the=20
> conference object is a child of a parent conference. This element=20
> contains the conference object Identifier (XCON-URI) (different from=20
> the main XCON-URI) of the parent.
> - sidebar-parent; When this element is present, it indicates that the=20
> conference object represents a sidebar of another conference. This=20
> element contains the conference object Identifier (XCON-URI)=20
> (different from the main XCON-URI) of the parent.
>
> If nobody oppose to this modifications, we'll submit a new version of=20
> the document in brief.
>
> Of course, any feedback to the document or to the previous=20
> modifications are always very welcome. :)
>
> Cheers,
>
> Oscar
>



--=20
                             _\\|//_
                             ( O-O )
    ~~~~~~~~~~~~~~~~~~~~~~o00~~(_)~~00o~~~~~~~~~~~~~~~~~~~~~~~~
                     Simon Pietro Romano
               Universita' di Napoli Federico II
                  Computer Science Department
         Phone: +39 081 7683823 -- Fax: +39 081 7684219
                 e-mail: spromano@unina.it

     <<Molti mi dicono che lo scoraggiamento =E8 l'alibi degli
    idioti. Ci rifletto un istante; e mi scoraggio>>. Magritte.
                          oooO
    ~~~~~~~~~~~~~~~~~~~~~~(   )~~ Oooo~~~~~~~~~~~~~~~~~~~~~~~~~
                           \ (    (   )
                            \_)    ) /
                                  (_/


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--NextPart

A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Centralized Conferencing Working Group of the IETF.


	Title           : Conference Information Data Model for Centralized Conferencing (XCON)
	Author(s)       : O. Novo, et al.
	Filename        : draft-ietf-xcon-common-data-model-13.txt
	Pages           : 93
	Date            : 2009-04-06

This document defines an Extensible Markup Language (XML)-based
conference information data model for centralized conferencing
(XCON).  A conference information data model is designed to convey
information about the conference and about participation in the
conference.  The conference information data model defined in this
document constitutes an extension of the data format specified in the
Session Initiation Protocol (SIP) Event Package for Conference State.

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http://www.ietf.org/internet-drafts/draft-ietf-xcon-common-data-model-13.txt

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From gonzalo.camarillo@ericsson.com  Wed Apr  8 22:54:53 2009
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Hi,

the following (expired) draft was presented in the XCON session in San 
Francisco:

http://www.watersprings.org/pub/id/draft-sandbakken-xcon-bfcp-udp-00.txt

The agreement was that given the problems TCP has with NATs (the P2PSIP 
WG is currently discussing the same issue) it would be a good idea to 
define a more NAT-friendly transport for BFCP. The proposal was to 
simply use UDP (this is what existing deployments do).

Since BFCP messages can be rather long, we would need an applicability 
statement saying which types of messages cannot be used over UDP.

In order to specify the new UDP-based transport we can either put 
together a new draft or revise the BFCP specification. I got the action 
point to list the things that could be fixed in a potential revised BFCP 
spec. These are the contents of my notes. Of course, if someone knows of 
more issues, please let us know:

o When a user performs a third-party floor request the beneficiary of 
the floor is not informed when the floor is granted. This may not be a 
problem because endpoints using third-party floor requests probably have 
different means to get in synch but we may want to add some text about this.

o We do not have errors for an unsupported version of the protocol or 
for wrong message length. We do not have a general error either.

o When we get more experience on queue management from real deployments, 
it would be nice to explaining it further in the spec.

o UserStatus

UserStatus =   (COMMON-HEADER)
                   [BENEFICIARY-INFORMATION]
                 1*(FLOOR-REQUEST-INFORMATION) -> remove the 1
                  *[EXTENSION-ATTRIBUTE]

o A message may need to be longer than the maximum message length 
supported by the protocol

o A rather small number of typos


As you can see, at this point there are not so many things to fix... so, 
the simplest way forward may be to simply specify a new UDP-based 
transport for BFCP. In any case, I would like to get feedback from folks 
operating BFCP deployments.

A different alternative (the one the P2PSIP WG is looking at) would be 
to either use a UDP encapsulation for TCP or to specify a new transport 
protocol... but these alternatives may be more complex than just using UDP.

Comments?

Thanks,

Gonzalo

From Markus.Isomaki@nokia.com  Thu Apr  9 01:02:17 2009
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From: <Markus.Isomaki@nokia.com>
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Hi Gonzalo,

The problem with TCP and NATs usually stems from the scenario where both pa=
rties who want to communicate are behind a NAT. This is presumably often th=
e case with P2PSIP. However, I've thought that BFCP would be typically depl=
oyed in a fashion where the conference focus (or the element managing the f=
loor) would be hosted in a public address. In such a case TCP definitely wo=
rks much better even if the conference participant would be behind a NAT.

So, does the motivation for BFCP over UDP come from the requirement that th=
e conference focus (the floor "manager") would itself need to be behind a N=
AT? This might be a valid requirement as such, when we think about endpoint=
 hosted conferences. But even in those cases TCP could still work, if we as=
sume that some infra like TURN-TCP or comedia/TCP aware SBCs (which we have=
 discussed in SIMPLE lately) would be available. Again in P2PSIP the situat=
ion is different as they can't assume that kind of infra (the peers themsel=
ves need to provide it). So, I'm not sure if BFCP and P2PSIP requirements a=
re identical. Unless you think about BFCP within a P2PSIP deployment.

Sorry, I didn't attend the XCON session in San Francisco, this was probably=
 well covered there.

(I agree that there are many situations where defining how to tunnel/emulat=
e TCP-like transport service over UDP. So, I think the best would be if TSV=
 area could define one single solution and then protocols like P2PSIP, MSRP=
, BFCP etc. could use it.)

Markus

 =20

>-----Original Message-----
>From: xcon-bounces@ietf.org [mailto:xcon-bounces@ietf.org] On=20
>Behalf Of ext Gonzalo Camarillo
>Sent: 09 April, 2009 08:56
>To: XCON
>Cc: xcon-chairs@tools.ietf.org
>Subject: [XCON] BFCP over UDP
>
>Hi,
>
>the following (expired) draft was presented in the XCON session in San
>Francisco:
>
>http://www.watersprings.org/pub/id/draft-sandbakken-xcon-bfcp-u
>dp-00.txt
>
>The agreement was that given the problems TCP has with NATs=20
>(the P2PSIP WG is currently discussing the same issue) it=20
>would be a good idea to define a more NAT-friendly transport=20
>for BFCP. The proposal was to simply use UDP (this is what=20
>existing deployments do).
>
>Since BFCP messages can be rather long, we would need an=20
>applicability statement saying which types of messages cannot=20
>be used over UDP.
>
>In order to specify the new UDP-based transport we can either=20
>put together a new draft or revise the BFCP specification. I=20
>got the action point to list the things that could be fixed in=20
>a potential revised BFCP spec. These are the contents of my=20
>notes. Of course, if someone knows of more issues, please let us know:
>
>o When a user performs a third-party floor request the=20
>beneficiary of the floor is not informed when the floor is=20
>granted. This may not be a problem because endpoints using=20
>third-party floor requests probably have different means to=20
>get in synch but we may want to add some text about this.
>
>o We do not have errors for an unsupported version of the=20
>protocol or for wrong message length. We do not have a general=20
>error either.
>
>o When we get more experience on queue management from real=20
>deployments, it would be nice to explaining it further in the spec.
>
>o UserStatus
>
>UserStatus =3D   (COMMON-HEADER)
>                   [BENEFICIARY-INFORMATION]
>                 1*(FLOOR-REQUEST-INFORMATION) -> remove the 1
>                  *[EXTENSION-ATTRIBUTE]
>
>o A message may need to be longer than the maximum message=20
>length supported by the protocol
>
>o A rather small number of typos
>
>
>As you can see, at this point there are not so many things to=20
>fix... so, the simplest way forward may be to simply specify a=20
>new UDP-based transport for BFCP. In any case, I would like to=20
>get feedback from folks operating BFCP deployments.
>
>A different alternative (the one the P2PSIP WG is looking at)=20
>would be to either use a UDP encapsulation for TCP or to=20
>specify a new transport protocol... but these alternatives may=20
>be more complex than just using UDP.
>
>Comments?
>
>Thanks,
>
>Gonzalo
>_______________________________________________
>XCON mailing list
>XCON@ietf.org
>https://www.ietf.org/mailman/listinfo/xcon
>=

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From: "Duddy, Sean (Sean)" <duddy@avaya.com>
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Subject: [XCON] draft-ietf-xcon-common-data-model-13
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Hi folks,
    The XCON data model states that=20
=20
"The <conference-time>
   element contains one or more <entry> elements each defining the time
   information specifying a single conference occurrence."
=20
Since an ICAL object can specify the complete timing information for all
occurences
belonging to a conference, why is this sequence of elements required?=20
=20
=20
Sean

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<BODY>
<DIV><SPAN class=3D622583913-09042009><FONT face=3DArial size=3D2>Hi=20
folks,</FONT></SPAN></DIV>
<DIV><SPAN class=3D622583913-09042009>&nbsp;&nbsp;&nbsp; <FONT =
face=3DArial=20
size=3D2>The XCON data model states that </FONT></SPAN></DIV>
<DIV><SPAN class=3D622583913-09042009><FONT face=3DArial=20
size=3D2></FONT></SPAN>&nbsp;</DIV>
<DIV><SPAN class=3D622583913-09042009><FONT face=3DArial size=3D2><FONT=20
face=3D"Times New Roman" size=3D3>"T</FONT></FONT></SPAN><SPAN=20
class=3D622583913-09042009>he &lt;conference-time&gt;<BR>&nbsp;&nbsp; =
element=20
contains one or more &lt;entry&gt; elements each defining the=20
time<BR>&nbsp;&nbsp; information specifying a single conference=20
occurrence."</SPAN></DIV>
<DIV><SPAN class=3D622583913-09042009><FONT face=3DArial=20
size=3D2></FONT></SPAN>&nbsp;</DIV>
<DIV><SPAN class=3D622583913-09042009><FONT face=3DArial size=3D2>Since =
an ICAL object=20
can specify the complete timing information for all=20
occurences</FONT></SPAN></DIV>
<DIV><SPAN class=3D622583913-09042009><FONT face=3DArial =
size=3D2>belonging to a=20
conference, why is this sequence of elements required? =
</FONT></SPAN></DIV>
<DIV><SPAN class=3D622583913-09042009><FONT face=3DArial=20
size=3D2></FONT></SPAN>&nbsp;</DIV>
<DIV><SPAN class=3D622583913-09042009><FONT face=3DArial=20
size=3D2></FONT></SPAN>&nbsp;</DIV>
<DIV><SPAN class=3D622583913-09042009><FONT face=3DArial=20
size=3D2>Sean</FONT></SPAN></DIV></BODY></HTML>

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From duddy@avaya.com  Thu Apr  9 09:53:44 2009
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To: <xcon@ietf.org>
Subject: [XCON] draft-ietf-xcon-ccmp-02
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Hi Folks,
    How does a ccmp client request a specify media type for its
conference
(e.g. audio or audio+video or video only)?=20
=20
Th data model has an <available-media> element but only the server has
the=20
information to populate this
(http://tools.ietf.org/html/rfc4575#section-5.3.4)
and the definition of this element alone implies what media is available
and not=20
how to request a specific media...
=20
Regards
Sean

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<BODY>
<DIV><SPAN class=3D834274216-09042009><FONT face=3DArial size=3D2>Hi=20
Folks,</FONT></SPAN></DIV>
<DIV><SPAN class=3D834274216-09042009>&nbsp;&nbsp;&nbsp;&nbsp;<FONT =
face=3DArial=20
size=3D2>How does a ccmp client request a specify media type for its=20
conference</FONT></SPAN></DIV>
<DIV><SPAN class=3D834274216-09042009><FONT face=3DArial size=3D2>(e.g. =
audio or=20
audio+video or video only)? </FONT></SPAN></DIV>
<DIV><SPAN class=3D834274216-09042009><FONT face=3DArial=20
size=3D2></FONT></SPAN>&nbsp;</DIV>
<DIV><SPAN class=3D834274216-09042009><FONT face=3DArial size=3D2>Th =
data model has an=20
&lt;available-media&gt; element but only the server has the =
</FONT></SPAN></DIV>
<DIV><SPAN class=3D834274216-09042009><FONT face=3DArial =
size=3D2>information to=20
populate this (<A=20
href=3D"http://tools.ietf.org/html/rfc4575#section-5.3.4">http://tools.ie=
tf.org/html/rfc4575#section-5.3.4</A>)</FONT></SPAN></DIV>
<DIV><SPAN class=3D834274216-09042009><FONT face=3DArial size=3D2>and =
the definition=20
of this element alone implies what media is available and not=20
</FONT></SPAN></DIV>
<DIV><SPAN class=3D834274216-09042009><FONT face=3DArial size=3D2>how to =
request a=20
specific media...</FONT></SPAN></DIV>
<DIV><SPAN class=3D834274216-09042009><FONT face=3DArial=20
size=3D2></FONT></SPAN>&nbsp;</DIV>
<DIV><SPAN class=3D834274216-09042009><FONT face=3DArial=20
size=3D2>Regards</FONT></SPAN></DIV>
<DIV><SPAN class=3D834274216-09042009><FONT face=3DArial=20
size=3D2>Sean</FONT></SPAN></DIV></BODY></HTML>

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From oscar.novo@ericsson.com  Mon Apr 13 22:54:20 2009
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From: "Oscar Novo" <oscar.novo@ericsson.com>
To: "Duddy, Sean (Sean)" <duddy@avaya.com>, <xcon@ietf.org>
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Hi,
=20
That's only a matter of configurability. A way to make possible to
define different policies (must-join-before-offset,
can-join-after-offset, ... ) for the same conference at different times.

The specification of all the occurences in a single element is possible
too as shown by the example in section 7.
=20
Oscar
=20
=20
________________________________

From: xcon-bounces@ietf.org [mailto:xcon-bounces@ietf.org] On Behalf Of
Duddy, Sean (Sean)
Sent: 9. huhtikuuta 2009 18:28
To: xcon@ietf.org
Subject: [XCON] draft-ietf-xcon-common-data-model-13


Hi folks,
    The XCON data model states that=20
=20
"The <conference-time>
   element contains one or more <entry> elements each defining the time
   information specifying a single conference occurrence."
=20
Since an ICAL object can specify the complete timing information for all
occurences
belonging to a conference, why is this sequence of elements required?=20
=20
=20
Sean

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<BODY>
<DIV dir=3Dltr align=3Dleft><SPAN class=3D915564405-14042009><FONT =
face=3DArial=20
color=3D#0000ff size=3D2>Hi,</FONT></SPAN></DIV>
<DIV dir=3Dltr align=3Dleft><SPAN class=3D915564405-14042009><FONT =
face=3DArial=20
color=3D#0000ff size=3D2></FONT></SPAN>&nbsp;</DIV>
<DIV dir=3Dltr align=3Dleft><SPAN class=3D915564405-14042009><FONT =
face=3DArial=20
color=3D#0000ff size=3D2>That's only a matter of configurability.&nbsp;A =
way to make=20
possible to define different policies (must-join-before-offset,=20
can-join-after-offset, ... ) for the same conference at different times. =

</FONT></SPAN></DIV>
<DIV dir=3Dltr align=3Dleft><SPAN class=3D915564405-14042009><FONT =
face=3DArial=20
color=3D#0000ff size=3D2>The specification of all the occurences in a =
single element=20
is possible too as shown by the example in section =
7.</FONT></SPAN></DIV>
<DIV dir=3Dltr align=3Dleft><SPAN class=3D915564405-14042009><FONT =
face=3DArial=20
color=3D#0000ff size=3D2></FONT></SPAN>&nbsp;</DIV>
<DIV dir=3Dltr align=3Dleft><SPAN class=3D915564405-14042009><FONT =
face=3DArial=20
color=3D#0000ff size=3D2>Oscar</FONT></SPAN></DIV>
<DIV dir=3Dltr align=3Dleft><SPAN class=3D915564405-14042009><FONT =
face=3DArial=20
color=3D#0000ff size=3D2></FONT></SPAN><SPAN =
class=3D915564405-14042009><FONT=20
face=3DArial color=3D#0000ff size=3D2></FONT></SPAN>&nbsp;</DIV>
<DIV dir=3Dltr align=3Dleft><SPAN class=3D915564405-14042009><FONT =
face=3DArial=20
color=3D#0000ff size=3D2></FONT></SPAN>&nbsp;</DIV>
<DIV dir=3Dltr align=3Dleft>
<HR tabIndex=3D-1>
</DIV>
<DIV dir=3Dltr align=3Dleft><FONT face=3DTahoma size=3D2><B>From:</B>=20
xcon-bounces@ietf.org [mailto:xcon-bounces@ietf.org] <B>On Behalf Of =
</B>Duddy,=20
Sean (Sean)<BR><B>Sent:</B> 9. huhtikuuta 2009 18:28<BR><B>To:</B>=20
xcon@ietf.org<BR><B>Subject:</B> [XCON]=20
draft-ietf-xcon-common-data-model-13<BR></FONT><BR></DIV>
<DIV></DIV>
<DIV><SPAN class=3D622583913-09042009><FONT face=3DArial size=3D2>Hi=20
folks,</FONT></SPAN></DIV>
<DIV><SPAN class=3D622583913-09042009>&nbsp;&nbsp;&nbsp; <FONT =
face=3DArial=20
size=3D2>The XCON data model states that </FONT></SPAN></DIV>
<DIV><SPAN class=3D622583913-09042009><FONT face=3DArial=20
size=3D2></FONT></SPAN>&nbsp;</DIV>
<DIV><SPAN class=3D622583913-09042009><FONT face=3DArial size=3D2><FONT=20
face=3D"Times New Roman" size=3D3>"T</FONT></FONT></SPAN><SPAN=20
class=3D622583913-09042009>he &lt;conference-time&gt;<BR>&nbsp;&nbsp; =
element=20
contains one or more &lt;entry&gt; elements each defining the=20
time<BR>&nbsp;&nbsp; information specifying a single conference=20
occurrence."</SPAN></DIV>
<DIV><SPAN class=3D622583913-09042009><FONT face=3DArial=20
size=3D2></FONT></SPAN>&nbsp;</DIV>
<DIV><SPAN class=3D622583913-09042009><FONT face=3DArial size=3D2>Since =
an ICAL object=20
can specify the complete timing information for all=20
occurences</FONT></SPAN></DIV>
<DIV><SPAN class=3D622583913-09042009><FONT face=3DArial =
size=3D2>belonging to a=20
conference, why is this sequence of elements required? =
</FONT></SPAN></DIV>
<DIV><SPAN class=3D622583913-09042009><FONT face=3DArial=20
size=3D2></FONT></SPAN>&nbsp;</DIV>
<DIV><SPAN class=3D622583913-09042009><FONT face=3DArial=20
size=3D2></FONT></SPAN>&nbsp;</DIV>
<DIV><SPAN class=3D622583913-09042009><FONT face=3DArial=20
size=3D2>Sean</FONT></SPAN></DIV></BODY></HTML>

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From: "Duddy, Sean (Sean)" <duddy@avaya.com>
To: "Oscar Novo" <oscar.novo@ericsson.com>, <xcon@ietf.org>
Subject: Re: [XCON] draft-ietf-xcon-common-data-model-13
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Hi Oscar,
    ok that sounds reasonable. Should the draft be updated to include
the explanation below?
=20
Sean
________________________________

From: Oscar Novo [mailto:oscar.novo@ericsson.com]=20
Sent: 14 April 2009 06:55
To: Duddy, Sean (Sean); xcon@ietf.org
Subject: RE: [XCON] draft-ietf-xcon-common-data-model-13


Hi,
=20
That's only a matter of configurability. A way to make possible to
define different policies (must-join-before-offset,
can-join-after-offset, ... ) for the same conference at different times.

The specification of all the occurences in a single element is possible
too as shown by the example in section 7.
=20
Oscar
=20
=20
________________________________

From: xcon-bounces@ietf.org [mailto:xcon-bounces@ietf.org] On Behalf Of
Duddy, Sean (Sean)
Sent: 9. huhtikuuta 2009 18:28
To: xcon@ietf.org
Subject: [XCON] draft-ietf-xcon-common-data-model-13


Hi folks,
    The XCON data model states that=20
=20
"The <conference-time>
   element contains one or more <entry> elements each defining the time
   information specifying a single conference occurrence."
=20
Since an ICAL object can specify the complete timing information for all
occurences
belonging to a conference, why is this sequence of elements required?=20
=20
=20
Sean

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<BODY>
<DIV dir=3Dltr align=3Dleft><SPAN class=3D756481809-14042009><FONT =
face=3DArial=20
color=3D#0000ff size=3D2>Hi Oscar,</FONT></SPAN></DIV>
<DIV dir=3Dltr align=3Dleft><SPAN =
class=3D756481809-14042009>&nbsp;&nbsp;&nbsp; <FONT=20
face=3DArial><FONT color=3D#0000ff size=3D2>ok that sounds reasonable. =
Should the=20
draft be updated to include the explanation =
below?</FONT></FONT></SPAN></DIV>
<DIV dir=3Dltr align=3Dleft><SPAN class=3D756481809-14042009><FONT =
face=3DArial=20
color=3D#0000ff size=3D2></FONT></SPAN>&nbsp;</DIV>
<DIV dir=3Dltr align=3Dleft><SPAN class=3D756481809-14042009><FONT =
face=3DArial=20
color=3D#0000ff size=3D2>Sean</FONT></SPAN></DIV>
<DIV dir=3Dltr align=3Dleft>
<HR tabIndex=3D-1>
</DIV>
<DIV dir=3Dltr align=3Dleft><FONT face=3DTahoma size=3D2><B>From:</B> =
Oscar Novo=20
[mailto:oscar.novo@ericsson.com] <BR><B>Sent:</B> 14 April 2009=20
06:55<BR><B>To:</B> Duddy, Sean (Sean); xcon@ietf.org<BR><B>Subject:</B> =
RE:=20
[XCON] draft-ietf-xcon-common-data-model-13<BR></FONT><BR></DIV>
<DIV></DIV>
<DIV dir=3Dltr align=3Dleft><SPAN class=3D915564405-14042009><FONT =
face=3DArial=20
color=3D#0000ff size=3D2>Hi,</FONT></SPAN></DIV>
<DIV dir=3Dltr align=3Dleft><SPAN class=3D915564405-14042009><FONT =
face=3DArial=20
color=3D#0000ff size=3D2></FONT></SPAN>&nbsp;</DIV>
<DIV dir=3Dltr align=3Dleft><SPAN class=3D915564405-14042009><FONT =
face=3DArial=20
color=3D#0000ff size=3D2>That's only a matter of configurability.&nbsp;A =
way to make=20
possible to define different policies (must-join-before-offset,=20
can-join-after-offset, ... ) for the same conference at different times. =

</FONT></SPAN></DIV>
<DIV dir=3Dltr align=3Dleft><SPAN class=3D915564405-14042009><FONT =
face=3DArial=20
color=3D#0000ff size=3D2>The specification of all the occurences in a =
single element=20
is possible too as shown by the example in section =
7.</FONT></SPAN></DIV>
<DIV dir=3Dltr align=3Dleft><SPAN class=3D915564405-14042009><FONT =
face=3DArial=20
color=3D#0000ff size=3D2></FONT></SPAN>&nbsp;</DIV>
<DIV dir=3Dltr align=3Dleft><SPAN class=3D915564405-14042009><FONT =
face=3DArial=20
color=3D#0000ff size=3D2>Oscar</FONT></SPAN></DIV>
<DIV dir=3Dltr align=3Dleft><SPAN class=3D915564405-14042009><FONT =
face=3DArial=20
color=3D#0000ff size=3D2></FONT></SPAN><SPAN =
class=3D915564405-14042009><FONT=20
face=3DArial color=3D#0000ff size=3D2></FONT></SPAN>&nbsp;</DIV>
<DIV dir=3Dltr align=3Dleft><SPAN class=3D915564405-14042009><FONT =
face=3DArial=20
color=3D#0000ff size=3D2></FONT></SPAN>&nbsp;</DIV>
<DIV dir=3Dltr align=3Dleft>
<HR tabIndex=3D-1>
</DIV>
<DIV dir=3Dltr align=3Dleft><FONT face=3DTahoma size=3D2><B>From:</B>=20
xcon-bounces@ietf.org [mailto:xcon-bounces@ietf.org] <B>On Behalf Of =
</B>Duddy,=20
Sean (Sean)<BR><B>Sent:</B> 9. huhtikuuta 2009 18:28<BR><B>To:</B>=20
xcon@ietf.org<BR><B>Subject:</B> [XCON]=20
draft-ietf-xcon-common-data-model-13<BR></FONT><BR></DIV>
<DIV></DIV>
<DIV><SPAN class=3D622583913-09042009><FONT face=3DArial size=3D2>Hi=20
folks,</FONT></SPAN></DIV>
<DIV><SPAN class=3D622583913-09042009>&nbsp;&nbsp;&nbsp; <FONT =
face=3DArial=20
size=3D2>The XCON data model states that </FONT></SPAN></DIV>
<DIV><SPAN class=3D622583913-09042009><FONT face=3DArial=20
size=3D2></FONT></SPAN>&nbsp;</DIV>
<DIV><SPAN class=3D622583913-09042009><FONT face=3DArial size=3D2><FONT=20
face=3D"Times New Roman" size=3D3>"T</FONT></FONT></SPAN><SPAN=20
class=3D622583913-09042009>he &lt;conference-time&gt;<BR>&nbsp;&nbsp; =
element=20
contains one or more &lt;entry&gt; elements each defining the=20
time<BR>&nbsp;&nbsp; information specifying a single conference=20
occurrence."</SPAN></DIV>
<DIV><SPAN class=3D622583913-09042009><FONT face=3DArial=20
size=3D2></FONT></SPAN>&nbsp;</DIV>
<DIV><SPAN class=3D622583913-09042009><FONT face=3DArial size=3D2>Since =
an ICAL object=20
can specify the complete timing information for all=20
occurences</FONT></SPAN></DIV>
<DIV><SPAN class=3D622583913-09042009><FONT face=3DArial =
size=3D2>belonging to a=20
conference, why is this sequence of elements required? =
</FONT></SPAN></DIV>
<DIV><SPAN class=3D622583913-09042009><FONT face=3DArial=20
size=3D2></FONT></SPAN>&nbsp;</DIV>
<DIV><SPAN class=3D622583913-09042009><FONT face=3DArial=20
size=3D2></FONT></SPAN>&nbsp;</DIV>
<DIV><SPAN class=3D622583913-09042009><FONT face=3DArial=20
size=3D2>Sean</FONT></SPAN></DIV></BODY></HTML>

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From oscar.novo@ericsson.com  Tue Apr 14 03:39:52 2009
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From: "Oscar Novo" <oscar.novo@ericsson.com>
To: "Duddy, Sean (Sean)" <duddy@avaya.com>, <xcon@ietf.org>
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Hi,
=20
Yes, I'll explain a bit better that section in the previous version of
the draft
=20
Thanks for your comment!
=20
Oscar

________________________________

From: Duddy, Sean (Sean) [mailto:duddy@avaya.com]=20
Sent: 14. huhtikuuta 2009 12:34
To: Oscar Novo; xcon@ietf.org
Subject: RE: [XCON] draft-ietf-xcon-common-data-model-13


Hi Oscar,
    ok that sounds reasonable. Should the draft be updated to include
the explanation below?
=20
Sean
________________________________

From: Oscar Novo [mailto:oscar.novo@ericsson.com]=20
Sent: 14 April 2009 06:55
To: Duddy, Sean (Sean); xcon@ietf.org
Subject: RE: [XCON] draft-ietf-xcon-common-data-model-13


Hi,
=20
That's only a matter of configurability. A way to make possible to
define different policies (must-join-before-offset,
can-join-after-offset, ... ) for the same conference at different times.

The specification of all the occurences in a single element is possible
too as shown by the example in section 7.
=20
Oscar
=20
=20
________________________________

From: xcon-bounces@ietf.org [mailto:xcon-bounces@ietf.org] On Behalf Of
Duddy, Sean (Sean)
Sent: 9. huhtikuuta 2009 18:28
To: xcon@ietf.org
Subject: [XCON] draft-ietf-xcon-common-data-model-13


Hi folks,
    The XCON data model states that=20
=20
"The <conference-time>
   element contains one or more <entry> elements each defining the time
   information specifying a single conference occurrence."
=20
Since an ICAL object can specify the complete timing information for all
occurences
belonging to a conference, why is this sequence of elements required?=20
=20
=20
Sean

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<BODY>
<DIV dir=3Dltr align=3Dleft><SPAN class=3D090583910-14042009><FONT =
face=3DArial=20
color=3D#0000ff size=3D2>Hi,</FONT></SPAN></DIV>
<DIV dir=3Dltr align=3Dleft><SPAN class=3D090583910-14042009><FONT =
face=3DArial=20
color=3D#0000ff size=3D2></FONT></SPAN>&nbsp;</DIV>
<DIV dir=3Dltr align=3Dleft><SPAN class=3D090583910-14042009><FONT =
face=3DArial=20
color=3D#0000ff size=3D2>Yes, I'll explain a bit better that section in =
the previous=20
version of the draft</FONT></SPAN></DIV>
<DIV dir=3Dltr align=3Dleft><SPAN class=3D090583910-14042009><FONT =
face=3DArial=20
color=3D#0000ff size=3D2></FONT></SPAN>&nbsp;</DIV>
<DIV dir=3Dltr align=3Dleft><SPAN class=3D090583910-14042009><FONT =
face=3DArial=20
color=3D#0000ff size=3D2>Thanks for your comment!</FONT></SPAN></DIV>
<DIV dir=3Dltr align=3Dleft><SPAN class=3D090583910-14042009><FONT =
face=3DArial=20
color=3D#0000ff size=3D2></FONT></SPAN>&nbsp;</DIV>
<DIV dir=3Dltr align=3Dleft><SPAN class=3D090583910-14042009><FONT =
face=3DArial=20
color=3D#0000ff size=3D2>Oscar</FONT></SPAN></DIV><BR>
<DIV class=3DOutlookMessageHeader lang=3Den-us dir=3Dltr align=3Dleft>
<HR tabIndex=3D-1>
<FONT face=3DTahoma size=3D2><B>From:</B> Duddy, Sean (Sean)=20
[mailto:duddy@avaya.com] <BR><B>Sent:</B> 14. huhtikuuta 2009=20
12:34<BR><B>To:</B> Oscar Novo; xcon@ietf.org<BR><B>Subject:</B> RE: =
[XCON]=20
draft-ietf-xcon-common-data-model-13<BR></FONT><BR></DIV>
<DIV></DIV>
<DIV dir=3Dltr align=3Dleft><SPAN class=3D756481809-14042009><FONT =
face=3DArial=20
color=3D#0000ff size=3D2>Hi Oscar,</FONT></SPAN></DIV>
<DIV dir=3Dltr align=3Dleft><SPAN =
class=3D756481809-14042009>&nbsp;&nbsp;&nbsp; <FONT=20
face=3DArial><FONT color=3D#0000ff size=3D2>ok that sounds reasonable. =
Should the=20
draft be updated to include the explanation =
below?</FONT></FONT></SPAN></DIV>
<DIV dir=3Dltr align=3Dleft><SPAN class=3D756481809-14042009><FONT =
face=3DArial=20
color=3D#0000ff size=3D2></FONT></SPAN>&nbsp;</DIV>
<DIV dir=3Dltr align=3Dleft><SPAN class=3D756481809-14042009><FONT =
face=3DArial=20
color=3D#0000ff size=3D2>Sean</FONT></SPAN></DIV>
<DIV dir=3Dltr align=3Dleft>
<HR tabIndex=3D-1>
</DIV>
<DIV dir=3Dltr align=3Dleft><FONT face=3DTahoma size=3D2><B>From:</B> =
Oscar Novo=20
[mailto:oscar.novo@ericsson.com] <BR><B>Sent:</B> 14 April 2009=20
06:55<BR><B>To:</B> Duddy, Sean (Sean); xcon@ietf.org<BR><B>Subject:</B> =
RE:=20
[XCON] draft-ietf-xcon-common-data-model-13<BR></FONT><BR></DIV>
<DIV></DIV>
<DIV dir=3Dltr align=3Dleft><SPAN class=3D915564405-14042009><FONT =
face=3DArial=20
color=3D#0000ff size=3D2>Hi,</FONT></SPAN></DIV>
<DIV dir=3Dltr align=3Dleft><SPAN class=3D915564405-14042009><FONT =
face=3DArial=20
color=3D#0000ff size=3D2></FONT></SPAN>&nbsp;</DIV>
<DIV dir=3Dltr align=3Dleft><SPAN class=3D915564405-14042009><FONT =
face=3DArial=20
color=3D#0000ff size=3D2>That's only a matter of configurability.&nbsp;A =
way to make=20
possible to define different policies (must-join-before-offset,=20
can-join-after-offset, ... ) for the same conference at different times. =

</FONT></SPAN></DIV>
<DIV dir=3Dltr align=3Dleft><SPAN class=3D915564405-14042009><FONT =
face=3DArial=20
color=3D#0000ff size=3D2>The specification of all the occurences in a =
single element=20
is possible too as shown by the example in section =
7.</FONT></SPAN></DIV>
<DIV dir=3Dltr align=3Dleft><SPAN class=3D915564405-14042009><FONT =
face=3DArial=20
color=3D#0000ff size=3D2></FONT></SPAN>&nbsp;</DIV>
<DIV dir=3Dltr align=3Dleft><SPAN class=3D915564405-14042009><FONT =
face=3DArial=20
color=3D#0000ff size=3D2>Oscar</FONT></SPAN></DIV>
<DIV dir=3Dltr align=3Dleft><SPAN class=3D915564405-14042009><FONT =
face=3DArial=20
color=3D#0000ff size=3D2></FONT></SPAN><SPAN =
class=3D915564405-14042009><FONT=20
face=3DArial color=3D#0000ff size=3D2></FONT></SPAN>&nbsp;</DIV>
<DIV dir=3Dltr align=3Dleft><SPAN class=3D915564405-14042009><FONT =
face=3DArial=20
color=3D#0000ff size=3D2></FONT></SPAN>&nbsp;</DIV>
<DIV dir=3Dltr align=3Dleft>
<HR tabIndex=3D-1>
</DIV>
<DIV dir=3Dltr align=3Dleft><FONT face=3DTahoma size=3D2><B>From:</B>=20
xcon-bounces@ietf.org [mailto:xcon-bounces@ietf.org] <B>On Behalf Of =
</B>Duddy,=20
Sean (Sean)<BR><B>Sent:</B> 9. huhtikuuta 2009 18:28<BR><B>To:</B>=20
xcon@ietf.org<BR><B>Subject:</B> [XCON]=20
draft-ietf-xcon-common-data-model-13<BR></FONT><BR></DIV>
<DIV></DIV>
<DIV><SPAN class=3D622583913-09042009><FONT face=3DArial size=3D2>Hi=20
folks,</FONT></SPAN></DIV>
<DIV><SPAN class=3D622583913-09042009>&nbsp;&nbsp;&nbsp; <FONT =
face=3DArial=20
size=3D2>The XCON data model states that </FONT></SPAN></DIV>
<DIV><SPAN class=3D622583913-09042009><FONT face=3DArial=20
size=3D2></FONT></SPAN>&nbsp;</DIV>
<DIV><SPAN class=3D622583913-09042009><FONT face=3DArial size=3D2><FONT=20
face=3D"Times New Roman" size=3D3>"T</FONT></FONT></SPAN><SPAN=20
class=3D622583913-09042009>he &lt;conference-time&gt;<BR>&nbsp;&nbsp; =
element=20
contains one or more &lt;entry&gt; elements each defining the=20
time<BR>&nbsp;&nbsp; information specifying a single conference=20
occurrence."</SPAN></DIV>
<DIV><SPAN class=3D622583913-09042009><FONT face=3DArial=20
size=3D2></FONT></SPAN>&nbsp;</DIV>
<DIV><SPAN class=3D622583913-09042009><FONT face=3DArial size=3D2>Since =
an ICAL object=20
can specify the complete timing information for all=20
occurences</FONT></SPAN></DIV>
<DIV><SPAN class=3D622583913-09042009><FONT face=3DArial =
size=3D2>belonging to a=20
conference, why is this sequence of elements required? =
</FONT></SPAN></DIV>
<DIV><SPAN class=3D622583913-09042009><FONT face=3DArial=20
size=3D2></FONT></SPAN>&nbsp;</DIV>
<DIV><SPAN class=3D622583913-09042009><FONT face=3DArial=20
size=3D2></FONT></SPAN>&nbsp;</DIV>
<DIV><SPAN class=3D622583913-09042009><FONT face=3DArial=20
size=3D2>Sean</FONT></SPAN></DIV></BODY></HTML>

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From adam@nostrum.com  Wed Apr 15 11:28:57 2009
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[as chair]

Please review the minutes from the San Francisco face-to-face meeting, 
and submit any corrections or amendments you feel are appropriate to the 
chairs:

   http://www.ietf.org/proceedings/09mar/minutes/xcon.txt

Based on modest support for adding a milestone to create a call-flows 
document, we have revised the charter to add one additional deliverable; 
see the final milestone here:

   http://www.ietf.org/html.charters/xcon-charter.html

We have also rescheduled the remaining deliverables to reflect a more 
realistic timeframe, given the additional time taken up by the protocol 
changes from SOAP to REST to the current format.

/a

From duddy@avaya.com  Thu Apr 16 02:24:06 2009
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From: "Duddy, Sean (Sean)" <duddy@avaya.com>
To: "Adam Roach" <adam@nostrum.com>, "XCON-IETF" <xcon@ietf.org>
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Hi Folks,
	Is this new callflow doc about CCMP callflows ? If yes, why is
its publication date April 2010 and
the ccmp August 09? I would have thought these end dates should be
alligned...

Here's my 2 cents about the issues highlighted in the 09Mar minutes:-
Use Cases:-=20
	There seems to be quiete a bit of time spent around cloning
conferences and managing the behaviour of the subsequently created
conferences, however I am not fully convinced of usefulness of this
feature is. Typically every newly created conference will need a unique
name,passcodes,user list, descriptions etc and would need to be
specified by the client. Using the cloning method, this means two
operations, which is not ideal. I envisage clients using blueprints as
templates, i.e. they retrieve a particular template, make the relevant
changes to it and then send it off in a=20
create request. I would like to see some use cases detailed for this
scenario in the CCMP draft.

Atomicity:-
	Regarding multiple users, atomicity does not apply. i.e. you
can't rollback and start removing the newly added users if one user cant
be added to the conference. I think for that specific use case, its best
effort and typically it
should be an asynchronous operation, i.e. the ccmp client should not be
hung waiting on all people to get into the=20
Conference and instead it should be be notified as the users arrive into
the conference.=20

Notifications:-
	CCMP notifications is yet to be defined/decided. I think xcon
should separate the notification transport
mechanism from the actual content and subscription mechanism. i.e. the
content of the notfications should be no different
for a ccmp client than a sip client, what is different is the transport
protocol used to receive the notifications.=20
I think draft-ietf-xcon-event-package-01.txt should be changed to define
the notification format for the data model and then have a separate
section on how to receive these notifications via SIP. The CCMP draft
then can reference this draft for the notification format and would need
to specify how these notications should be received.

Sean


-----Original Message-----
From: xcon-bounces@ietf.org [mailto:xcon-bounces@ietf.org] On Behalf Of
Adam Roach
Sent: 15 April 2009 19:30
To: XCON-IETF
Cc: Alan Johnston
Subject: [XCON] Minutes Posted / Milestones Updated

[as chair]

Please review the minutes from the San Francisco face-to-face meeting,
and submit any corrections or amendments you feel are appropriate to the
chairs:

   http://www.ietf.org/proceedings/09mar/minutes/xcon.txt

Based on modest support for adding a milestone to create a call-flows
document, we have revised the charter to add one additional deliverable;
see the final milestone here:

   http://www.ietf.org/html.charters/xcon-charter.html

We have also rescheduled the remaining deliverables to reflect a more
realistic timeframe, given the additional time taken up by the protocol
changes from SOAP to REST to the current format.

/a
_______________________________________________
XCON mailing list
XCON@ietf.org
https://www.ietf.org/mailman/listinfo/xcon

From geir.sandbakken@tandberg.com  Thu Apr 16 03:04:32 2009
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Cc: Gonzalo.Camarillo@ericsson.com, xcon-chairs@tools.ietf.org, xcon@ietf.org
Subject: Re: [XCON] BFCP over UDP
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Markus,

The are two main uses cases that lead to the deployment of BFCP over 
UDP. Firstly - as you mention - is when the focus resides behind a NAT. 
Many video conference endpoints can take the role as a focus mixing 
multiple calls. Also, enterprise deployments tend to place the bridges 
behind the corporate NATs. Secondly BFCP is utilized in vanilla p-t-p 
calls for presentation tokens control.

Other motivations are that we want BFCP to work with ICE, and when you 
have taken the cost of setting up a BFCP server, client and possibly a 
turn resource - it is a very tempting to extend it for other uses as well.

Geir Arne

Markus.Isomaki@nokia.com wrote:
> Hi Gonzalo,
>
> The problem with TCP and NATs usually stems from the scenario where both parties who want to communicate are behind a NAT. This is presumably often the case with P2PSIP. However, I've thought that BFCP would be typically deployed in a fashion where the conference focus (or the element managing the floor) would be hosted in a public address. In such a case TCP definitely works much better even if the conference participant would be behind a NAT.
>
> So, does the motivation for BFCP over UDP come from the requirement that the conference focus (the floor "manager") would itself need to be behind a NAT? This might be a valid requirement as such, when we think about endpoint hosted conferences. But even in those cases TCP could still work, if we assume that some infra like TURN-TCP or comedia/TCP aware SBCs (which we have discussed in SIMPLE lately) would be available. Again in P2PSIP the situation is different as they can't assume that kind of infra (the peers themselves need to provide it). So, I'm not sure if BFCP and P2PSIP requirements are identical. Unless you think about BFCP within a P2PSIP deployment.
>
> Sorry, I didn't attend the XCON session in San Francisco, this was probably well covered there.
>
> (I agree that there are many situations where defining how to tunnel/emulate TCP-like transport service over UDP. So, I think the best would be if TSV area could define one single solution and then protocols like P2PSIP, MSRP, BFCP etc. could use it.)
>
> Markus
>
>   
>
>   
>> -----Original Message-----
>> From: xcon-bounces@ietf.org [mailto:xcon-bounces@ietf.org] On 
>> Behalf Of ext Gonzalo Camarillo
>> Sent: 09 April, 2009 08:56
>> To: XCON
>> Cc: xcon-chairs@tools.ietf.org
>> Subject: [XCON] BFCP over UDP
>>
>> Hi,
>>
>> the following (expired) draft was presented in the XCON session in San
>> Francisco:
>>
>> http://www.watersprings.org/pub/id/draft-sandbakken-xcon-bfcp-u
>> dp-00.txt
>>
>> The agreement was that given the problems TCP has with NATs 
>> (the P2PSIP WG is currently discussing the same issue) it 
>> would be a good idea to define a more NAT-friendly transport 
>> for BFCP. The proposal was to simply use UDP (this is what 
>> existing deployments do).
>>
>> Since BFCP messages can be rather long, we would need an 
>> applicability statement saying which types of messages cannot 
>> be used over UDP.
>>
>> In order to specify the new UDP-based transport we can either 
>> put together a new draft or revise the BFCP specification. I 
>> got the action point to list the things that could be fixed in 
>> a potential revised BFCP spec. These are the contents of my 
>> notes. Of course, if someone knows of more issues, please let us know:
>>
>> o When a user performs a third-party floor request the 
>> beneficiary of the floor is not informed when the floor is 
>> granted. This may not be a problem because endpoints using 
>> third-party floor requests probably have different means to 
>> get in synch but we may want to add some text about this.
>>
>> o We do not have errors for an unsupported version of the 
>> protocol or for wrong message length. We do not have a general 
>> error either.
>>
>> o When we get more experience on queue management from real 
>> deployments, it would be nice to explaining it further in the spec.
>>
>> o UserStatus
>>
>> UserStatus =   (COMMON-HEADER)
>>                   [BENEFICIARY-INFORMATION]
>>                 1*(FLOOR-REQUEST-INFORMATION) -> remove the 1
>>                  *[EXTENSION-ATTRIBUTE]
>>
>> o A message may need to be longer than the maximum message 
>> length supported by the protocol
>>
>> o A rather small number of typos
>>
>>
>> As you can see, at this point there are not so many things to 
>> fix... so, the simplest way forward may be to simply specify a 
>> new UDP-based transport for BFCP. In any case, I would like to 
>> get feedback from folks operating BFCP deployments.
>>
>> A different alternative (the one the P2PSIP WG is looking at) 
>> would be to either use a UDP encapsulation for TCP or to 
>> specify a new transport protocol... but these alternatives may 
>> be more complex than just using UDP.
>>
>> Comments?
>>
>> Thanks,
>>
>> Gonzalo
>> _______________________________________________
>> XCON mailing list
>> XCON@ietf.org
>> https://www.ietf.org/mailman/listinfo/xcon
>>
>>     
> _______________________________________________
> XCON mailing list
> XCON@ietf.org
> https://www.ietf.org/mailman/listinfo/xcon
>   


From adam@nostrum.com  Thu Apr 16 07:33:21 2009
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[as chair]

Duddy, Sean (Sean) wrote:
> Hi Folks,
> 	Is this new callflow doc about CCMP callflows ? If yes, why is
> its publication date April 2010 and
> the ccmp August 09? I would have thought these end dates should be
> alligned...
>    

The logic here was that the callflows document depends on the protocol, 
but not the other way around (cf. RFC 3261 and RFC 3665).

That said, we're happy to adjust the schedule according to working group 
consensus (subject to reality checks -- we may require additional people 
to commit to being authors before moving milestones earlier). Does 
anyone else want to weigh in on the timeline?


> I think draft-ietf-xcon-event-package-01.txt should be changed...


draft-ietf-xcon-event-package has been handed off to the IESG for 
publication. We could pull it back if we found a critical flaw. 
Retracting it for anything less would be considered unnecessarily 
disruptive.

/a

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Cc: XCON <xcon@ietf.org>, xcon-chairs@tools.ietf.org
Subject: Re: [XCON] BFCP over UDP
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Gonzalo,

The UDP usage draft does utilize transaction ids more and has a few 
extra messages to get reliable delivery.  The changes are still very 
minor to the protocol itself and our implementation of it. 

IMHO having a single way of operating the protocol is better than having 
two different modes of operation.  Also as mentioned in San Francisco it 
makes any intermediaries easier to implement only having to forward 
messages independent of transport.   Can we do a bis?

Geir Arne

Gonzalo Camarillo wrote:
> Hi,
>
> the following (expired) draft was presented in the XCON session in San 
> Francisco:
>
> http://www.watersprings.org/pub/id/draft-sandbakken-xcon-bfcp-udp-00.txt
>
> The agreement was that given the problems TCP has with NATs (the 
> P2PSIP WG is currently discussing the same issue) it would be a good 
> idea to define a more NAT-friendly transport for BFCP. The proposal 
> was to simply use UDP (this is what existing deployments do).
>
> Since BFCP messages can be rather long, we would need an applicability 
> statement saying which types of messages cannot be used over UDP.
>
> In order to specify the new UDP-based transport we can either put 
> together a new draft or revise the BFCP specification. I got the 
> action point to list the things that could be fixed in a potential 
> revised BFCP spec. These are the contents of my notes. Of course, if 
> someone knows of more issues, please let us know:
>
> o When a user performs a third-party floor request the beneficiary of 
> the floor is not informed when the floor is granted. This may not be a 
> problem because endpoints using third-party floor requests probably 
> have different means to get in synch but we may want to add some text 
> about this.
>
> o We do not have errors for an unsupported version of the protocol or 
> for wrong message length. We do not have a general error either.
>
> o When we get more experience on queue management from real 
> deployments, it would be nice to explaining it further in the spec.
>
> o UserStatus
>
> UserStatus =   (COMMON-HEADER)
>                   [BENEFICIARY-INFORMATION]
>                 1*(FLOOR-REQUEST-INFORMATION) -> remove the 1
>                  *[EXTENSION-ATTRIBUTE]
>
> o A message may need to be longer than the maximum message length 
> supported by the protocol
>
> o A rather small number of typos
>
>
> As you can see, at this point there are not so many things to fix... 
> so, the simplest way forward may be to simply specify a new UDP-based 
> transport for BFCP. In any case, I would like to get feedback from 
> folks operating BFCP deployments.
>
> A different alternative (the one the P2PSIP WG is looking at) would be 
> to either use a UDP encapsulation for TCP or to specify a new 
> transport protocol... but these alternatives may be more complex than 
> just using UDP.
>
> Comments?
>
> Thanks,
>
> Gonzalo


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My name is Andrew Ghiassi and I'm new to the Internet Draft subscription relpy.  I've signed up for this draft becasue I find it the most interesting however I honestly don't understande where to go from here.  I always receive e-mails regarding certain topics and would like to know how I can participate. some insight would be nice...thank you--Andrew
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<table cellspacing="0" cellpadding="0" border="0" ><tr><td valign="top" style="font: inherit;"><BR>
<BLOCKQUOTE style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: rgb(16,16,255) 2px solid"><PRE>My name is Andrew Ghiassi and I'm new to the Internet Draft subscription relpy.  I've signed up for this draft becasue I find it the most interesting however I honestly don't understande where to go from here.  I always receive e-mails regarding certain topics and would like to know how I can participate. some insight would be nice...thank you--Andrew</PRE></BLOCKQUOTE></td></tr></table>
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I just wanted to make sure that I was reading=A0"Figure=A01"=A0correctly si=
nce I'm not exactly sure how to read these diagrams.=A0 This isn't the firs=
t time I've seen diagrams like these in internet drafts so some insight wou=
ld be helpful..To begin, it seems as though the conferencing client has con=
trol over the 4 protocols: conference,floor, call signaling, and=A0notifica=
tion; each which do a different task.=A0 These 4 protocols are then linked =
to their respective servers which relay the information to the conference o=
bject...From here is it saying that=A0each conference object contains the c=
onference information data model show beneath it?=A0 If this is true then t=
he conference object would contain informaion about its duration, times, ho=
st info, membership, ets...Please let me know If I'm reading this correctly=
..Thank you --Andrew Ghiassi
=A0
=A0=A0=A0=A0
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<table cellspacing=3D"0" cellpadding=3D"0" border=3D"0" ><tr><td valign=3D"=
top" style=3D"font: inherit;"><DIV>I just wanted to make sure that I was re=
ading&nbsp;"Figure&nbsp;1"&nbsp;correctly since I'm not exactly sure how to=
 read these diagrams.&nbsp; This isn't the first time I've seen diagrams li=
ke these in internet drafts so some insight would be helpful..To begin, it =
seems as though the conferencing client has control over the 4 protocols: c=
onference,floor, call signaling, and&nbsp;notification; each which do a dif=
ferent task.&nbsp; These 4 protocols are then linked to their respective se=
rvers which relay the information to the conference object...From here is i=
t saying that&nbsp;each conference object contains the conference informati=
on data model show beneath it?&nbsp; If this is true then the conference ob=
ject would contain informaion about its duration, times, host info, members=
hip, ets...Please let me know If I'm reading this correctly..Thank you
 --Andrew Ghiassi</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;</DIV></td></tr></table>
--0-759313875-1240470057=:86691--

From mary.barnes@nortel.com  Thu Apr 23 06:45:24 2009
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From: "Mary Barnes" <mary.barnes@nortel.com>
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Subject: Re: [XCON] "Conference Information Data Model for CentralizedConferencing (XCON)"
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Yes, you are reading the diagram correctly. You might find it helpful to
read the XCON FW (RFC 5239) if you have not already as that gives more
background and description of the core functional elements, but youre
interpretation is correct
=20
Regards,
Mary.=20

________________________________

From: xcon-bounces@ietf.org [mailto:xcon-bounces@ietf.org] On Behalf Of
ZIA GHIASSI
Sent: Thursday, April 23, 2009 2:01 AM
To: xcon@ietf.org
Subject: [XCON] "Conference Information Data Model for
CentralizedConferencing (XCON)"


I just wanted to make sure that I was reading "Figure 1" correctly since
I'm not exactly sure how to read these diagrams.  This isn't the first
time I've seen diagrams like these in internet drafts so some insight
would be helpful..To begin, it seems as though the conferencing client
has control over the 4 protocols: conference,floor, call signaling, and
notification; each which do a different task.  These 4 protocols are
then linked to their respective servers which relay the information to
the conference object...From here is it saying that each conference
object contains the conference information data model show beneath it?
If this is true then the conference object would contain informaion
about its duration, times, host info, membership, ets...Please let me
know If I'm reading this correctly..Thank you --Andrew Ghiassi
=20
   =20

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charset=3Dus-ascii">
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<BODY>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN =
class=3D609484313-23042009>Yes,=20
you are reading the diagram correctly. You might find it helpful to read =
the=20
XCON FW (RFC 5239) if you have not already as that gives more background =
and=20
description of the core functional elements, but youre interpretation is =

correct</SPAN></FONT></DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN=20
class=3D609484313-23042009></SPAN></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN=20
class=3D609484313-23042009>Regards,</SPAN></FONT></DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN =
class=3D609484313-23042009>Mary.=20
</SPAN></FONT></DIV><BR>
<DIV class=3DOutlookMessageHeader lang=3Den-us dir=3Dltr align=3Dleft>
<HR tabIndex=3D-1>
<FONT face=3DTahoma size=3D2><B>From:</B> xcon-bounces@ietf.org=20
[mailto:xcon-bounces@ietf.org] <B>On Behalf Of </B>ZIA =
GHIASSI<BR><B>Sent:</B>=20
Thursday, April 23, 2009 2:01 AM<BR><B>To:</B> =
xcon@ietf.org<BR><B>Subject:</B>=20
[XCON] "Conference Information Data Model for CentralizedConferencing=20
(XCON)"<BR></FONT><BR></DIV>
<DIV></DIV>
<TABLE cellSpacing=3D0 cellPadding=3D0 border=3D0>
  <TBODY>
  <TR>
    <TD vAlign=3Dtop>
      <DIV>I just wanted to make sure that I was=20
      reading&nbsp;"Figure&nbsp;1"&nbsp;correctly since I'm not exactly =
sure how=20
      to read these diagrams.&nbsp; This isn't the first time I've seen =
diagrams=20
      like these in internet drafts so some insight would be helpful..To =
begin,=20
      it seems as though the conferencing client has control over the 4=20
      protocols: conference,floor, call signaling, =
and&nbsp;notification; each=20
      which do a different task.&nbsp; These 4 protocols are then linked =
to=20
      their respective servers which relay the information to the =
conference=20
      object...From here is it saying that&nbsp;each conference object =
contains=20
      the conference information data model show beneath it?&nbsp; If =
this is=20
      true then the conference object would contain informaion about its =

      duration, times, host info, membership, ets...Please let me know =
If I'm=20
      reading this correctly..Thank you --Andrew Ghiassi</DIV>
      <DIV>&nbsp;</DIV>
      =
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;</DIV></TD></TR></TBODY></TABLE></BODY></HTM=
L>

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From mary.barnes@nortel.com  Fri Apr 24 12:50:16 2009
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From: "Mary Barnes" <mary.barnes@nortel.com>
To: "Duddy, Sean (Sean)" <duddy@avaya.com>, <xcon@ietf.org>
Subject: Re: [XCON] draft-ietf-xcon-ccmp-02
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Hi Sean,
=20
Apologies, as I can't see that anyone ever responded to your question.
Yes, the server would be the one to populate the <available-media>
element. Per the XCON framework this is information that would be part
of the blueprint. =20
=20
There is a <mixer-type> for each <user> element that contains the type
of media and a <controls> element in the data model that contain basic
video and audio controls.  For each <endpoint> there is a <media>
element in the data model to capture the source of
media(<to-mixer>/<from-mixer>  for a specific endpoint.  These types are
all borrowed from RFC 4575, so they are not described in the xcon
data-model document.=20
=20
And, there are specific media control elements for floor control. =20
=20
When a client is joining a conference, the setup of a specific media
type would be negotiated between the signaling and media control client
(e.g., SIP client) and the focus.  And, something like the mediactrl
protocol could be used, which is what is shown in the call flows
document:
http://tools.ietf.org/id/draft-barnes-xcon-examples-01.txt
=20
Does that answer your question?
=20
Regards,
Mary.=20
=20
________________________________

From: xcon-bounces@ietf.org [mailto:xcon-bounces@ietf.org] On Behalf Of
Duddy, Sean (Sean)
Sent: Thursday, April 09, 2009 11:55 AM
To: xcon@ietf.org
Subject: [XCON] draft-ietf-xcon-ccmp-02


Hi Folks,
    How does a ccmp client request a specify media type for its
conference
(e.g. audio or audio+video or video only)?=20
=20
Th data model has an <available-media> element but only the server has
the=20
information to populate this
(http://tools.ietf.org/html/rfc4575#section-5.3.4)
and the definition of this element alone implies what media is available
and not=20
how to request a specific media...
=20
Regards
Sean

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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META http-equiv=3DContent-Type content=3D"text/html; =
charset=3Dus-ascii">
<META content=3D"MSHTML 6.00.2900.3492" name=3DGENERATOR></HEAD>
<BODY>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN =
class=3D109152019-24042009>Hi=20
Sean,</SPAN></FONT></DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN=20
class=3D109152019-24042009></SPAN></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN=20
class=3D109152019-24042009>Apologies, as I can't see that anyone ever =
responded to=20
your question.&nbsp;&nbsp; Yes, the server would be the one to populate =
the=20
&lt;available-media&gt; element. Per the XCON framework this is =
information that=20
would be part of the blueprint.&nbsp; </SPAN></FONT></DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN=20
class=3D109152019-24042009></SPAN></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN =
class=3D109152019-24042009>There=20
is a &lt;mixer-type&gt; for each &lt;user&gt; element that contains the =
type of=20
media and a &lt;controls&gt; element in the data model that contain =
basic video=20
and audio controls.&nbsp;&nbsp;For each &lt;endpoint&gt; there is a=20
&lt;media&gt; element in the data model to capture the&nbsp;source of=20
media(&lt;to-mixer&gt;/&lt;from-mixer&gt; &nbsp;for a specific =
endpoint.&nbsp;=20
These types are all borrowed from RFC 4575, so they are not described in =
the=20
xcon data-model document. </SPAN></FONT></DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN=20
class=3D109152019-24042009></SPAN></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN =
class=3D109152019-24042009>And,=20
there are specific media control elements for floor control.&nbsp;=20
</SPAN></FONT></DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN=20
class=3D109152019-24042009></SPAN></FONT>&nbsp;</DIV>
<DIV><SPAN class=3D109152019-24042009>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN =
class=3D109152019-24042009>When a=20
client is joining a conference, the setup of a specific media type would =
be=20
negotiated&nbsp;between&nbsp;the signaling and media control client =
(e.g., SIP=20
client) and the focus.&nbsp; And, something like the mediactrl protocol =
could be=20
used, which is what is shown in the call flows =
document:</SPAN></FONT></DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN =
class=3D109152019-24042009><A=20
href=3D"http://tools.ietf.org/id/draft-barnes-xcon-examples-01.txt">http:=
//tools.ietf.org/id/draft-barnes-xcon-examples-01.txt</A></SPAN></FONT></=
DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN=20
class=3D109152019-24042009></SPAN></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN =
class=3D109152019-24042009>Does=20
that answer your question?</SPAN></FONT></DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN=20
class=3D109152019-24042009></SPAN></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN=20
class=3D109152019-24042009></SPAN></FONT><FONT face=3DArial><FONT=20
color=3D#0000ff><FONT size=3D2>R<SPAN=20
class=3D109152019-24042009>egards,</SPAN></FONT></FONT></FONT></SPAN></DI=
V></DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN =
class=3D109152019-24042009>Mary.=20
</SPAN></FONT></DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN=20
class=3D109152019-24042009></SPAN></FONT>&nbsp;</DIV>
<DIV>
<HR tabIndex=3D-1>
</DIV>
<DIV><FONT face=3DTahoma size=3D2><B>From:</B> xcon-bounces@ietf.org=20
[mailto:xcon-bounces@ietf.org] <B>On Behalf Of </B>Duddy, Sean=20
(Sean)<BR><B>Sent:</B> Thursday, April 09, 2009 11:55 AM<BR><B>To:</B>=20
xcon@ietf.org<BR><B>Subject:</B> [XCON]=20
draft-ietf-xcon-ccmp-02<BR></FONT><BR></DIV>
<DIV></DIV>
<DIV><SPAN class=3D834274216-09042009><FONT face=3DArial size=3D2>Hi=20
Folks,</FONT></SPAN></DIV>
<DIV><SPAN class=3D834274216-09042009>&nbsp;&nbsp;&nbsp;&nbsp;<FONT =
face=3DArial=20
size=3D2>How does a ccmp client request a specify media type for its=20
conference</FONT></SPAN></DIV>
<DIV><SPAN class=3D834274216-09042009><FONT face=3DArial size=3D2>(e.g. =
audio or=20
audio+video or video only)? </FONT></SPAN></DIV>
<DIV><SPAN class=3D834274216-09042009><FONT face=3DArial=20
size=3D2></FONT></SPAN>&nbsp;</DIV>
<DIV><SPAN class=3D834274216-09042009><FONT face=3DArial size=3D2>Th =
data model has an=20
&lt;available-media&gt; element but only the server has the =
</FONT></SPAN></DIV>
<DIV><SPAN class=3D834274216-09042009><FONT face=3DArial =
size=3D2>information to=20
populate this (<A=20
href=3D"http://tools.ietf.org/html/rfc4575#section-5.3.4">http://tools.ie=
tf.org/html/rfc4575#section-5.3.4</A>)</FONT></SPAN></DIV>
<DIV><SPAN class=3D834274216-09042009><FONT face=3DArial size=3D2>and =
the definition=20
of this element alone implies what media is available and not=20
</FONT></SPAN></DIV>
<DIV><SPAN class=3D834274216-09042009><FONT face=3DArial size=3D2>how to =
request a=20
specific media...</FONT></SPAN></DIV>
<DIV><SPAN class=3D834274216-09042009><FONT face=3DArial=20
size=3D2></FONT></SPAN>&nbsp;</DIV>
<DIV><SPAN class=3D834274216-09042009><FONT face=3DArial=20
size=3D2>Regards</FONT></SPAN></DIV>
<DIV><SPAN class=3D834274216-09042009><FONT face=3DArial=20
size=3D2>Sean</FONT></SPAN></DIV></BODY></HTML>

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From michael.p.bober@gmail.com  Mon Apr 27 10:10:34 2009
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From: Michael Bober <michael.p.bober@gmail.com>
To: xcon@ietf.org
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Cc: alan@sipstation.com
Subject: [XCON] Section 8.2
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Section 8.2 discusses confidentiality, and it seems that encryption and
end-to-end authentication provide the most protection for XCON.  Since
hacking has been quite newsworthy in the recent weeks, I am interested to
know what kind of attack XCON would be susceptible to, if any.

Michael Bober

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<pre><font size="4">Section 8.2 discusses confidentiality, and it seems that encryption and
end-to-end authentication provide the most protection for XCON.  Since
hacking has been quite newsworthy in the recent weeks, I am interested to
know what kind of attack XCON would be susceptible to, if any.

Michael Bober</font><font size="6">
</font></pre>

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From michael.p.bober@gmail.com  Mon Apr 27 10:38:17 2009
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To clarify, the following question I submitted was in refference to
"draft-ietf-xcon-common-data-model-13.txt":

Section 8.2 discusses confidentiality, and it seems that encryption and
end-to-end authentication provide the most protection for XCON.  Since
hacking has been quite newsworthy in the recent weeks, I am interested to
know what kind of attack XCON would be susceptible to, if any.

Michael Bober

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<div>=A0</div>
<div><font style=3D"BACKGROUND-COLOR: #ffffff">To clarify, the following qu=
estion I submitted was in refference to &quot;draft-ietf-xcon-common-data-m=
odel-13.txt&quot;:<br></font></div>
<div><font style=3D"BACKGROUND-COLOR: #ffff00"></font>=A0</div>
<div><font style=3D"BACKGROUND-COLOR: #ffff00">Section 8.2 discusses confid=
entiality, and it seems that encryption and<br>end-to-end authentication pr=
ovide the most protection for XCON.=A0 Since<br>hacking has been quite news=
worthy in the recent weeks, I am interested to<br>
know what kind of attack XCON would be susceptible to, if any.</font></div>
<p><font style=3D"BACKGROUND-COLOR: #ffff00">Michael Bober</font></p>

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I have a question reguarding Conference Information Data Model for
Centralized Conferencing (XCON)draft-ietf-xcon-common-data-model-13.txt
Internet-Draft.  Section 8.2 talks a little bit about confidentiality.  Is
the intent of this section to allow (say any two) members of a certain
confererance to maintain a private discussion in which the other members
of the same conference would not be privy to?  If so would the
participants interested (or allowed) to join to prvate conversation be
required to reauthenticate, and renegotiate encryption?  Also if this
capability were implemented, would there be in upper limit to number of
private conversations allowed in the conferance, or a limited of the
amount of nesting (e.g. private converstaions within private conversations
with ...)that would be possible?

Thank you,
Johnathon Ney


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--001636c5b47ebb134a04688f73a4
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My question refers specifically to the implementation part of CCMP.  I was
wondering if all firmware on user agents would have to be updated before
this protocol can be used or is this still compatible with the current
version of SIP.  Also, what is new about this protocol?  I thought current
conferencing already had the ability to modify the enviroment?

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<div>My question refers specifically to the implementation part of CCMP.=A0=
 I was wondering if all firmware on user agents would have to be updated be=
fore this protocol can be used or is this still compatible with the current=
 version of SIP.=A0 Also, what is new about this protocol?=A0 I thought cur=
rent conferencing already had the ability to modify the enviroment?</div>

--001636c5b47ebb134a04688f73a4--

From oscar.novo@ericsson.com  Tue Apr 28 00:32:00 2009
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From: "Oscar Novo" <oscar.novo@ericsson.com>
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Hello Johnathon,

I think you have the answers to your question in the document "A
Framework for Centralized Conferencing" (draft-ietf-xcon-framework-11).
I suggest you to read Section 9.6 "Whispering or Private Messages" and
section 11.1. "User Authentication and Authorization"
Actually, I recommend you to go through this document to get a better
understanding of the data model.

Cheers,

Oscar

=20

-----Original Message-----
From: xcon-bounces@ietf.org [mailto:xcon-bounces@ietf.org] On Behalf Of
jn8@cec.wustl.edu
Sent: 27. huhtikuuta 2009 20:58
To: xcon@ietf.org
Cc: alan@sipstation.com
Subject: [XCON] (no subject)

I have a question reguarding Conference Information Data Model for
Centralized Conferencing (XCON)draft-ietf-xcon-common-data-model-13.txt
Internet-Draft.  Section 8.2 talks a little bit about confidentiality.
Is the intent of this section to allow (say any two) members of a
certain confererance to maintain a private discussion in which the other
members of the same conference would not be privy to?  If so would the
participants interested (or allowed) to join to prvate conversation be
required to reauthenticate, and renegotiate encryption?  Also if this
capability were implemented, would there be in upper limit to number of
private conversations allowed in the conferance, or a limited of the
amount of nesting (e.g. private converstaions within private
conversations with ...)that would be possible?

Thank you,
Johnathon Ney

_______________________________________________
XCON mailing list
XCON@ietf.org
https://www.ietf.org/mailman/listinfo/xcon

From oscar.novo@ericsson.com  Tue Apr 28 00:47:00 2009
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From: "Oscar Novo" <oscar.novo@ericsson.com>
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Well, I haven't think myself in all the possible attacks but the most
important ones related to confidentiality could be:
=20
- An attacker may attempt to get access to confidential information from
eavesdropping.
=20
- An attacker may attempt to modify the messages exchange btw the client
and server (that's more related to integrity though)
=20
Oscar

=20
________________________________

From: xcon-bounces@ietf.org [mailto:xcon-bounces@ietf.org] On Behalf Of
Michael Bober
Sent: 27. huhtikuuta 2009 20:40
To: xcon@ietf.org
Subject: [XCON] correction to section 8.2 question


=20
To clarify, the following question I submitted was in refference to
"draft-ietf-xcon-common-data-model-13.txt":

=20
Section 8.2 discusses confidentiality, and it seems that encryption and
end-to-end authentication provide the most protection for XCON.  Since
hacking has been quite newsworthy in the recent weeks, I am interested
to
know what kind of attack XCON would be susceptible to, if any.

Michael Bober


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<HTML><HEAD>
<META http-equiv=3DContent-Type content=3D"text/html; =
charset=3Dus-ascii">
<META content=3D"MSHTML 6.00.6000.16830" name=3DGENERATOR></HEAD>
<BODY>
<DIV dir=3Dltr align=3Dleft><FONT face=3DArial color=3D#0000ff =
size=3D2><SPAN=20
class=3D095223507-28042009>Well, I haven't think myself in all the =
possible=20
attacks but the most important ones related to confidentiality could=20
be:</SPAN></FONT></DIV>
<DIV dir=3Dltr align=3Dleft><FONT face=3DArial color=3D#0000ff =
size=3D2><SPAN=20
class=3D095223507-28042009></SPAN></FONT>&nbsp;</DIV>
<DIV dir=3Dltr align=3Dleft><FONT face=3DArial color=3D#0000ff =
size=3D2><SPAN=20
class=3D095223507-28042009>- An attacker may attempt to get access to =
confidential=20
information from eavesdropping.</SPAN></FONT></DIV>
<DIV dir=3Dltr align=3Dleft><FONT face=3DArial color=3D#0000ff =
size=3D2><SPAN=20
class=3D095223507-28042009></SPAN></FONT>&nbsp;</DIV>
<DIV dir=3Dltr align=3Dleft><FONT face=3DArial color=3D#0000ff =
size=3D2><SPAN=20
class=3D095223507-28042009>- An attacker may attempt to modify the =
messages=20
exchange btw the client and server (that's more related to integrity=20
though)</SPAN></FONT></DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2></FONT>&nbsp;</DIV>
<DIV><SPAN class=3D095223507-28042009></SPAN><FONT face=3DArial><FONT=20
color=3D#0000ff><FONT size=3D2>Oscar</FONT></FONT></FONT></DIV>
<DIV><FONT face=3DArial><FONT color=3D#0000ff><FONT size=3D2><SPAN=20
class=3D095223507-28042009></SPAN></FONT></FONT></FONT><BR>&nbsp;</DIV>
<DIV class=3DOutlookMessageHeader lang=3Den-us dir=3Dltr align=3Dleft>
<HR tabIndex=3D-1>
<FONT face=3DTahoma size=3D2><B>From:</B> xcon-bounces@ietf.org=20
[mailto:xcon-bounces@ietf.org] <B>On Behalf Of </B>Michael =
Bober<BR><B>Sent:</B>=20
27. huhtikuuta 2009 20:40<BR><B>To:</B> xcon@ietf.org<BR><B>Subject:</B> =
[XCON]=20
correction to section 8.2 question<BR></FONT><BR></DIV>
<DIV></DIV>
<DIV>&nbsp;</DIV>
<DIV><FONT style=3D"BACKGROUND-COLOR: #ffffff">To clarify, the following =
question=20
I submitted was in refference to=20
"draft-ietf-xcon-common-data-model-13.txt":<BR></FONT></DIV>
<DIV><FONT style=3D"BACKGROUND-COLOR: #ffff00"></FONT>&nbsp;</DIV>
<DIV><FONT style=3D"BACKGROUND-COLOR: #ffff00">Section 8.2 discusses=20
confidentiality, and it seems that encryption and<BR>end-to-end =
authentication=20
provide the most protection for XCON.&nbsp; Since<BR>hacking has been =
quite=20
newsworthy in the recent weeks, I am interested to<BR>know what kind of =
attack=20
XCON would be susceptible to, if any.</FONT></DIV>
<P><FONT style=3D"BACKGROUND-COLOR: #ffff00">Michael=20
Bober</FONT></P></BODY></HTML>

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From alfred.heggestad@telio.no  Tue Apr 28 04:27:33 2009
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Hi

we are supporting this draft:

http://tools.ietf.org/html/draft-sandbakken-xcon-bfcp-udp-00


we are running endpoints with BFCP/UDP in our network today, which
is also working behind NAT due to SBC in network (SER+RTPproxy).
it was not an option for us to run BFCP over TCP, since this is
not working at all with endpoints behind NAT.

I also supports Geir Arne's view on BFCP/UDP for usage with ICE.


-- 
Alfred E. Heggestad - Telio AS
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From mary.barnes@nortel.com  Tue Apr 28 06:51:38 2009
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Thread-Topic: [XCON] correction to section 8.2 question
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References: <c19a0b0e0904271039i32bbbe58rd0cf2c2fe491dae8@mail.gmail.com> <9520E66537CC4941994C518E3E21091CF6894D@esealmw105.eemea.ericsson.se>
From: "Mary Barnes" <mary.barnes@nortel.com>
To: "Michael Bober" <michael.p.bober@gmail.com>, <xcon@ietf.org>
Subject: Re: [XCON] correction to section 8.2 question
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Hi Michael,
=20
The XCON FW (RFC 5239)  provides an overview of the potential attacks
for XCON, as well as some basic security mechanisms that should be
supported by a conferencing system and conferencing client.=20
=20
We will need to provide a detailed description of the security solution
for the XCON protocol in the CCMP protocol document:
http://tools.ietf.org/id/draft-ietf-xcon-ccmp-02.txt
=20
Since the protocol is based on HTTP(S), we will be relying on some of
the HTTP security mechanisms.=20
=20
We'll be updating the security section in the next revision and will
take your comment into consideration and we'd appreciate additional
feedback once we submit the revision.
=20
Thanks,
Mary.=20

________________________________

From: xcon-bounces@ietf.org [mailto:xcon-bounces@ietf.org] On Behalf Of
Oscar Novo
Sent: Tuesday, April 28, 2009 2:48 AM
To: Michael Bober; xcon@ietf.org
Subject: Re: [XCON] correction to section 8.2 question


Well, I haven't think myself in all the possible attacks but the most
important ones related to confidentiality could be:
=20
- An attacker may attempt to get access to confidential information from
eavesdropping.
=20
- An attacker may attempt to modify the messages exchange btw the client
and server (that's more related to integrity though)
=20
Oscar

=20
________________________________

From: xcon-bounces@ietf.org [mailto:xcon-bounces@ietf.org] On Behalf Of
Michael Bober
Sent: 27. huhtikuuta 2009 20:40
To: xcon@ietf.org
Subject: [XCON] correction to section 8.2 question


=20
To clarify, the following question I submitted was in refference to
"draft-ietf-xcon-common-data-model-13.txt":

=20
Section 8.2 discusses confidentiality, and it seems that encryption and
end-to-end authentication provide the most protection for XCON.  Since
hacking has been quite newsworthy in the recent weeks, I am interested
to
know what kind of attack XCON would be susceptible to, if any.

Michael Bober


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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<BODY>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN =
class=3D203424313-28042009>Hi=20
Michael,</SPAN></FONT></DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN=20
class=3D203424313-28042009></SPAN></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN =
class=3D203424313-28042009>The=20
XCON FW (RFC 5239)&nbsp; provides an overview of the potential attacks =
for XCON,=20
as well as some basic security mechanisms that should be supported by a=20
conferencing system and conferencing client. </SPAN></FONT></DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN=20
class=3D203424313-28042009></SPAN></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN =
class=3D203424313-28042009>We=20
will need to provide a detailed description of the security solution for =
the=20
XCON protocol in the CCMP protocol document:</SPAN></FONT></DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN =
class=3D203424313-28042009><A=20
href=3D"http://tools.ietf.org/id/draft-ietf-xcon-ccmp-02.txt">http://tool=
s.ietf.org/id/draft-ietf-xcon-ccmp-02.txt</A></SPAN></FONT></DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN=20
class=3D203424313-28042009></SPAN></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN =
class=3D203424313-28042009>Since=20
the protocol is based on HTTP(S), we will be relying on some of the HTTP =

security mechanisms. </SPAN></FONT></DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN=20
class=3D203424313-28042009></SPAN></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN =
class=3D203424313-28042009>We'll=20
be updating the security section in the next revision and will take your =
comment=20
into consideration and we'd appreciate additional feedback once we =
submit the=20
revision.</SPAN></FONT></DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN=20
class=3D203424313-28042009></SPAN></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN=20
class=3D203424313-28042009>Thanks</SPAN></FONT><FONT face=3DArial =
color=3D#0000ff=20
size=3D2><SPAN class=3D203424313-28042009>,</SPAN></FONT></DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN =
class=3D203424313-28042009>Mary.=20
</SPAN></FONT></DIV><BR>
<DIV class=3DOutlookMessageHeader lang=3Den-us dir=3Dltr align=3Dleft>
<HR tabIndex=3D-1>
<FONT face=3DTahoma size=3D2><B>From:</B> xcon-bounces@ietf.org=20
[mailto:xcon-bounces@ietf.org] <B>On Behalf Of </B>Oscar =
Novo<BR><B>Sent:</B>=20
Tuesday, April 28, 2009 2:48 AM<BR><B>To:</B> Michael Bober;=20
xcon@ietf.org<BR><B>Subject:</B> Re: [XCON] correction to section 8.2=20
question<BR></FONT><BR></DIV>
<DIV></DIV>
<DIV dir=3Dltr align=3Dleft><FONT face=3DArial color=3D#0000ff =
size=3D2><SPAN=20
class=3D095223507-28042009>Well, I haven't think myself in all the =
possible=20
attacks but the most important ones related to confidentiality could=20
be:</SPAN></FONT></DIV>
<DIV dir=3Dltr align=3Dleft><FONT face=3DArial color=3D#0000ff =
size=3D2><SPAN=20
class=3D095223507-28042009></SPAN></FONT>&nbsp;</DIV>
<DIV dir=3Dltr align=3Dleft><FONT face=3DArial color=3D#0000ff =
size=3D2><SPAN=20
class=3D095223507-28042009>- An attacker may attempt to get access to =
confidential=20
information from eavesdropping.</SPAN></FONT></DIV>
<DIV dir=3Dltr align=3Dleft><FONT face=3DArial color=3D#0000ff =
size=3D2><SPAN=20
class=3D095223507-28042009></SPAN></FONT>&nbsp;</DIV>
<DIV dir=3Dltr align=3Dleft><FONT face=3DArial color=3D#0000ff =
size=3D2><SPAN=20
class=3D095223507-28042009>- An attacker may attempt to modify the =
messages=20
exchange btw the client and server (that's more related to integrity=20
though)</SPAN></FONT></DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2></FONT>&nbsp;</DIV>
<DIV><SPAN class=3D095223507-28042009></SPAN><FONT face=3DArial><FONT=20
color=3D#0000ff><FONT size=3D2>Oscar</FONT></FONT></FONT></DIV>
<DIV><FONT face=3DArial><FONT color=3D#0000ff><FONT size=3D2><SPAN=20
class=3D095223507-28042009></SPAN></FONT></FONT></FONT><FONT =
face=3DArial=20
color=3D#0000ff size=3D2></FONT><FONT face=3DArial color=3D#0000ff =
size=3D2></FONT><FONT=20
face=3DArial color=3D#0000ff size=3D2></FONT><BR>&nbsp;</DIV>
<DIV class=3DOutlookMessageHeader lang=3Den-us dir=3Dltr align=3Dleft>
<HR tabIndex=3D-1>
<FONT face=3DTahoma size=3D2><B>From:</B> xcon-bounces@ietf.org=20
[mailto:xcon-bounces@ietf.org] <B>On Behalf Of </B>Michael =
Bober<BR><B>Sent:</B>=20
27. huhtikuuta 2009 20:40<BR><B>To:</B> xcon@ietf.org<BR><B>Subject:</B> =
[XCON]=20
correction to section 8.2 question<BR></FONT><BR></DIV>
<DIV></DIV>
<DIV>&nbsp;</DIV>
<DIV><FONT style=3D"BACKGROUND-COLOR: #ffffff">To clarify, the following =
question=20
I submitted was in refference to=20
"draft-ietf-xcon-common-data-model-13.txt":<BR></FONT></DIV>
<DIV><FONT style=3D"BACKGROUND-COLOR: #ffff00"></FONT>&nbsp;</DIV>
<DIV><FONT style=3D"BACKGROUND-COLOR: #ffff00">Section 8.2 discusses=20
confidentiality, and it seems that encryption and<BR>end-to-end =
authentication=20
provide the most protection for XCON.&nbsp; Since<BR>hacking has been =
quite=20
newsworthy in the recent weeks, I am interested to<BR>know what kind of =
attack=20
XCON would be susceptible to, if any.</FONT></DIV>
<P><FONT style=3D"BACKGROUND-COLOR: #ffff00">Michael=20
Bober</FONT></P></BODY></HTML>

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From mary.barnes@nortel.com  Tue Apr 28 08:38:49 2009
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From: "Mary Barnes" <mary.barnes@nortel.com>
To: "Adam Harbaugh" <adam.lee.person@gmail.com>, <xcon@ietf.org>
Cc: alan@sipstation.com
Subject: Re: [XCON] Centralized Conferencing Manipulation Protocol
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A client that has not implemented CCMP (i.e., a SIP client that supports
the SIP Conferencing Framework (RFC 4353) and SIP conferencing UA
functionality (RFC 4579) ) can still participate in a conference that is
based on the XCON FW and that also supports clients that have
implemented CCMP.   This is discussed in section 10 of the XCON FW (RFC
5239):
=20
   "User agents that only support [RFC4579] and do not
   support the Conferencing Control Protocol are still provided basic
   SIP conferencing, but cannot take advantage of any of the advanced
   features."
=20
Mary.=20

________________________________

From: xcon-bounces@ietf.org [mailto:xcon-bounces@ietf.org] On Behalf Of
Adam Harbaugh
Sent: Monday, April 27, 2009 3:47 PM
To: xcon@ietf.org
Cc: alan@sipstation.com
Subject: [XCON] Centralized Conferencing Manipulation Protocol


My question refers specifically to the implementation part of CCMP.  I
was wondering if all firmware on user agents would have to be updated
before this protocol can be used or is this still compatible with the
current version of SIP.  Also, what is new about this protocol?  I
thought current conferencing already had the ability to modify the
enviroment?

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<BODY>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN =
class=3D453413515-28042009>A=20
client that has not implemented CCMP (i.e., a SIP client that =
supports&nbsp;the=20
SIP Conferencing Framework&nbsp;(RFC 4353) and&nbsp;SIP conferencing UA=20
functionality (RFC&nbsp;4579) ) can still participate in a conference =
that is=20
based on the XCON FW and that also supports clients that have =
implemented=20
CCMP.&nbsp;&nbsp; This is discussed in section&nbsp;10&nbsp;of the XCON =
FW (RFC=20
5239):</SPAN></FONT></DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN=20
class=3D453413515-28042009></SPAN></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN=20
class=3D453413515-28042009>&nbsp;&nbsp;&nbsp;"User agents that only =
support=20
[RFC4579] and do not<BR>&nbsp;&nbsp; support the Conferencing Control =
Protocol=20
are still provided basic<BR>&nbsp;&nbsp; SIP conferencing, but cannot =
take=20
advantage of any of the advanced<BR>&nbsp;&nbsp; =
features."</SPAN></FONT></DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN=20
class=3D453413515-28042009></SPAN></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN =
class=3D453413515-28042009>Mary.=20
</SPAN></FONT></DIV><BR>
<DIV class=3DOutlookMessageHeader lang=3Den-us dir=3Dltr align=3Dleft>
<HR tabIndex=3D-1>
<FONT face=3DTahoma size=3D2><B>From:</B> xcon-bounces@ietf.org=20
[mailto:xcon-bounces@ietf.org] <B>On Behalf Of </B>Adam =
Harbaugh<BR><B>Sent:</B>=20
Monday, April 27, 2009 3:47 PM<BR><B>To:</B> xcon@ietf.org<BR><B>Cc:</B> =

alan@sipstation.com<BR><B>Subject:</B> [XCON] Centralized Conferencing=20
Manipulation Protocol<BR></FONT><BR></DIV>
<DIV></DIV>
<DIV>My question refers specifically to the implementation part of =
CCMP.&nbsp; I=20
was wondering if all firmware on user agents would have to be updated =
before=20
this protocol can be used or is this still compatible with the current =
version=20
of SIP.&nbsp; Also, what is new about this protocol?&nbsp; I thought =
current=20
conferencing already had the ability to modify the=20
enviroment?</DIV></BODY></HTML>

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