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From: "Ram Mohan R (rmohanr)" <rmohanr@cisco.com>
To: "straw@ietf.org" <straw@ietf.org>
Thread-Topic: New Version Notification for draft-ram-straw-b2bua-feature-tag-00.txt
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Subject: [straw] FW: New Version Notification for draft-ram-straw-b2bua-feature-tag-00.txt
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Hi All,

 We have published a new draft that extends the User Agent capabilities
specification(RFC 3840) to allow
   indication of Back-to-Back User Agent (B2BUA) types.
The motivation for this draft came out  of IESG review and subsequent
discussions of [I-D.ietf-straw-b2bua-stun] where it was pointed
that there is no existing mechanisms for B2BUA to indicate its presence
except for special cases like Focus.

Please review and provide your inputs.

Regards,
Authors

-----Original Message-----
From: "internet-drafts@ietf.org" <internet-drafts@ietf.org>
Date: Monday, 6 July 2015 8:08 pm
To: Cisco Employee <rmohanr@cisco.com>, "Tirumaleswar Reddy (tireddy)"
<tireddy@cisco.com>, "Gonzalo Salgueiro (gsalguei)" <gsalguei@cisco.com>,
"Gonzalo Salgueiro (gsalguei)" <gsalguei@cisco.com>, "Tirumaleswar Reddy
(tireddy)" <tireddy@cisco.com>, Cisco Employee <rmohanr@cisco.com>
Subject: New Version Notification for
draft-ram-straw-b2bua-feature-tag-00.txt

>
>A new version of I-D, draft-ram-straw-b2bua-feature-tag-00.txt
>has been successfully submitted by Ram Mohan Ravindranath and posted to
>the
>IETF repository.
>
>Name:		draft-ram-straw-b2bua-feature-tag
>Revision:	00
>Title:		A Session Initiation Protocol (SIP) Feature Tag for Back-to-Back
>User Agents (B2BUAs)
>Document date:	2015-07-06
>Group:		Individual Submission
>Pages:		8
>URL:           =20
>https://www.ietf.org/internet-drafts/draft-ram-straw-b2bua-feature-tag-00.
>txt
>Status:        =20
>https://datatracker.ietf.org/doc/draft-ram-straw-b2bua-feature-tag/
>Htmlized:      =20
>https://tools.ietf.org/html/draft-ram-straw-b2bua-feature-tag-00
>
>
>Abstract:
>   The User Agent capabilities specification allows Session Initiation
>   Protocol (SIP) User Agents to convey their capabilities and
>   characteristics to other User Agents and to the registrar for its
>   domain.  This information is conveyed as parameters of the Contact
>   header field.  Amongst those capabilities are the type of User Agent
>   that is available at a SIP Uniform Resource Identifier (URI).  This
>   document extends the User Agent capabilities specification to allow
>   indication of Back-to-Back User Agent (B2BUA) types.
>
>                 =20
>       =20
>
>
>Please note that it may take a couple of minutes from the time of
>submission
>until the htmlized version and diff are available at tools.ietf.org.
>
>The IETF Secretariat
>


From nobody Mon Jul  6 09:47:48 2015
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Subject: Re: [straw] FW: New Version Notification for draft-ram-straw-b2bua-feature-tag-00.txt
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Ram,

I am puzzled by this. I can't figure out when/how it would be used, or 
if/how it relates to RFC6809 (proxy-feature).

My problem is fundamentally whether the devices carrying this tag are to 
be viewed as endpoints or intermediaries. For the properties being 
described to be useful, I think one must view the device as an 
intermediary, that is somehow masking/modifying the intrinsic properties 
of the *actual* endpoint. Yet feature tags (callee capabilities) should 
be viewed as describing the target of communication.

RFC6809 provides a way of describing properties of intermediaries on the 
signaling (and potentially also the media) path. Perhaps this new 
property belongs there instead.

Another way to use a B2BUA is for me, as a user, to use a B2BUA as a 
foundation to build a virtual user agent, composed of one or more other 
UAs. That seems to fit your model. But in that case, other UAs 
interacting with it don't need to know that it is a B2BUA. Rather, they 
only need to know what capabilities it presents to the world. The fact 
that it is a B2BUA is simply an implementation detail.

	Thanks,
	Paul

On 7/6/15 12:07 PM, Ram Mohan R (rmohanr) wrote:
> Hi All,
>
>   We have published a new draft that extends the User Agent capabilities
> specification(RFC 3840) to allow
>     indication of Back-to-Back User Agent (B2BUA) types.
> The motivation for this draft came out  of IESG review and subsequent
> discussions of [I-D.ietf-straw-b2bua-stun] where it was pointed
> that there is no existing mechanisms for B2BUA to indicate its presence
> except for special cases like Focus.
>
> Please review and provide your inputs.
>
> Regards,
> Authors
>
> -----Original Message-----
> From: "internet-drafts@ietf.org" <internet-drafts@ietf.org>
> Date: Monday, 6 July 2015 8:08 pm
> To: Cisco Employee <rmohanr@cisco.com>, "Tirumaleswar Reddy (tireddy)"
> <tireddy@cisco.com>, "Gonzalo Salgueiro (gsalguei)" <gsalguei@cisco.com>,
> "Gonzalo Salgueiro (gsalguei)" <gsalguei@cisco.com>, "Tirumaleswar Reddy
> (tireddy)" <tireddy@cisco.com>, Cisco Employee <rmohanr@cisco.com>
> Subject: New Version Notification for
> draft-ram-straw-b2bua-feature-tag-00.txt
>
>>
>> A new version of I-D, draft-ram-straw-b2bua-feature-tag-00.txt
>> has been successfully submitted by Ram Mohan Ravindranath and posted to
>> the
>> IETF repository.
>>
>> Name:		draft-ram-straw-b2bua-feature-tag
>> Revision:	00
>> Title:		A Session Initiation Protocol (SIP) Feature Tag for Back-to-Back
>> User Agents (B2BUAs)
>> Document date:	2015-07-06
>> Group:		Individual Submission
>> Pages:		8
>> URL:
>> https://www.ietf.org/internet-drafts/draft-ram-straw-b2bua-feature-tag-00.
>> txt
>> Status:
>> https://datatracker.ietf.org/doc/draft-ram-straw-b2bua-feature-tag/
>> Htmlized:
>> https://tools.ietf.org/html/draft-ram-straw-b2bua-feature-tag-00
>>
>>
>> Abstract:
>>    The User Agent capabilities specification allows Session Initiation
>>    Protocol (SIP) User Agents to convey their capabilities and
>>    characteristics to other User Agents and to the registrar for its
>>    domain.  This information is conveyed as parameters of the Contact
>>    header field.  Amongst those capabilities are the type of User Agent
>>    that is available at a SIP Uniform Resource Identifier (URI).  This
>>    document extends the User Agent capabilities specification to allow
>>    indication of Back-to-Back User Agent (B2BUA) types.
>>
>>
>>
>>
>>
>> Please note that it may take a couple of minutes from the time of
>> submission
>> until the htmlized version and diff are available at tools.ietf.org.
>>
>> The IETF Secretariat
>>
>
> _______________________________________________
> straw mailing list
> straw@ietf.org
> https://www.ietf.org/mailman/listinfo/straw
>


From nobody Thu Jul  9 15:42:58 2015
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Subject: [straw] RFC 7584 on Session Traversal Utilities for NAT (STUN) Message Handling for SIP Back-to-Back User Agents (B2BUAs)
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A new Request for Comments is now available in online RFC libraries.

        
        RFC 7584

        Title:      Session Traversal Utilities for NAT 
                    (STUN) Message Handling for SIP Back-to-Back 
                    User Agents (B2BUAs) 
        Author:     R. Ravindranath, T. Reddy, G. Salgueiro
        Status:     Standards Track
        Stream:     IETF
        Date:       July 2015
        Mailbox:    rmohanr@cisco.com, 
                    tireddy@cisco.com, 
                    gsalguei@cisco.com
        Pages:      14
        Characters: 32675
        Updates/Obsoletes/SeeAlso:   None

        I-D Tag:    draft-ietf-straw-b2bua-stun-08.txt

        URL:        https://www.rfc-editor.org/info/rfc7584

        DOI:        http://dx.doi.org/10.17487/RFC7584

Session Initiation Protocol (SIP) Back-to-Back User Agents (B2BUAs)
are often designed to be on the media path rather than just
intercepting signaling.  This means that B2BUAs often act on the
media path leading to separate media legs that the B2BUA correlates
and bridges together.  When acting on the media path, B2BUAs are
likely to receive Session Traversal Utilities for NAT (STUN) packets
as part of Interactive Connectivity Establishment (ICE) processing.

This document defines behavior for a B2BUA performing ICE processing.
The goal of this document is to ensure that B2BUAs properly handle
SIP messages that carry ICE semantics in Session Description Protocol
(SDP) and STUN messages received as part of the ICE procedures for
NAT and Firewall traversal of multimedia sessions.

This document is a product of the Sip Traversal Required for Applications to Work Working Group of the IETF.

This is now a Proposed Standard.

STANDARDS TRACK: This document specifies an Internet Standards Track
protocol for the Internet community, and requests discussion and suggestions
for improvements.  Please refer to the current edition of the Official
Internet Protocol Standards (https://www.rfc-editor.org/standards) for the 
standardization state and status of this protocol.  Distribution of this 
memo is unlimited.

This announcement is sent to the IETF-Announce and rfc-dist lists.
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The RFC Editor Team
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From nobody Sun Jul 12 23:25:30 2015
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Thread-Topic: [straw] FW: New Version Notification for draft-ram-straw-b2bua-feature-tag-00.txt
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Date: Mon, 13 Jul 2015 06:25:22 +0000
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References: <20150706143859.26484.14872.idtracker@ietfa.amsl.com> <D1C0A2A2.37309%rmohanr@cisco.com> <559AB12A.40604@alum.mit.edu>
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Subject: Re: [straw] FW: New Version Notification for draft-ram-straw-b2bua-feature-tag-00.txt
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(As individual)

Hi,

I more or less share the questions raised by Paul.

Also, keep in mind that there might be multiple Contact modifying B2BUAs in=
 the path, which means that any media feature tag(s) inserted by B2BUA #1 m=
ay be overwritten by B2BUA #2.

So, one question is: what information do you want to provide? If you want a=
 list of *ALL* B2BUA types in the siganlling path then I think you would ne=
ed another mechanism, e.g. a feature capability indicator (fci).

Another question is: do you want the information bound to the domain name/I=
P address of the B2BUA? If so, keep in mind that fcis by default do not ind=
icate which entity the fci is associated with - only that there is *A* enti=
ty that that feature.

So, I think it would be good to write down what the requirements are. Perha=
ps they can be parsed from the text, but it would be good to have them expl=
icitly stated in a separate section.

Thanks!

Regards,

Christer

-----Original Message-----
From: straw [mailto:straw-bounces@ietf.org] On Behalf Of Paul Kyzivat
Sent: 6. hein=E4kuuta 2015 19:48
To: straw@ietf.org
Subject: Re: [straw] FW: New Version Notification for draft-ram-straw-b2bua=
-feature-tag-00.txt

Ram,

I am puzzled by this. I can't figure out when/how it would be used, or if/h=
ow it relates to RFC6809 (proxy-feature).

My problem is fundamentally whether the devices carrying this tag are to be=
 viewed as endpoints or intermediaries. For the properties being described =
to be useful, I think one must view the device as an intermediary, that is =
somehow masking/modifying the intrinsic properties of the *actual* endpoint=
. Yet feature tags (callee capabilities) should be viewed as describing the=
 target of communication.

RFC6809 provides a way of describing properties of intermediaries on the si=
gnaling (and potentially also the media) path. Perhaps this new property be=
longs there instead.

Another way to use a B2BUA is for me, as a user, to use a B2BUA as a founda=
tion to build a virtual user agent, composed of one or more other UAs. That=
 seems to fit your model. But in that case, other UAs interacting with it d=
on't need to know that it is a B2BUA. Rather, they only need to know what c=
apabilities it presents to the world. The fact that it is a B2BUA is simply=
 an implementation detail.

	Thanks,
	Paul

On 7/6/15 12:07 PM, Ram Mohan R (rmohanr) wrote:
> Hi All,
>
>   We have published a new draft that extends the User Agent=20
> capabilities specification(RFC 3840) to allow
>     indication of Back-to-Back User Agent (B2BUA) types.
> The motivation for this draft came out  of IESG review and subsequent=20
> discussions of [I-D.ietf-straw-b2bua-stun] where it was pointed that=20
> there is no existing mechanisms for B2BUA to indicate its presence=20
> except for special cases like Focus.
>
> Please review and provide your inputs.
>
> Regards,
> Authors
>
> -----Original Message-----
> From: "internet-drafts@ietf.org" <internet-drafts@ietf.org>
> Date: Monday, 6 July 2015 8:08 pm
> To: Cisco Employee <rmohanr@cisco.com>, "Tirumaleswar Reddy (tireddy)"
> <tireddy@cisco.com>, "Gonzalo Salgueiro (gsalguei)"=20
> <gsalguei@cisco.com>, "Gonzalo Salgueiro (gsalguei)"=20
> <gsalguei@cisco.com>, "Tirumaleswar Reddy (tireddy)"=20
> <tireddy@cisco.com>, Cisco Employee <rmohanr@cisco.com>
> Subject: New Version Notification for
> draft-ram-straw-b2bua-feature-tag-00.txt
>
>>
>> A new version of I-D, draft-ram-straw-b2bua-feature-tag-00.txt
>> has been successfully submitted by Ram Mohan Ravindranath and posted=20
>> to the IETF repository.
>>
>> Name:		draft-ram-straw-b2bua-feature-tag
>> Revision:	00
>> Title:		A Session Initiation Protocol (SIP) Feature Tag for Back-to-Back
>> User Agents (B2BUAs)
>> Document date:	2015-07-06
>> Group:		Individual Submission
>> Pages:		8
>> URL:
>> https://www.ietf.org/internet-drafts/draft-ram-straw-b2bua-feature-tag-0=
0.
>> txt
>> Status:
>> https://datatracker.ietf.org/doc/draft-ram-straw-b2bua-feature-tag/
>> Htmlized:
>> https://tools.ietf.org/html/draft-ram-straw-b2bua-feature-tag-00
>>
>>
>> Abstract:
>>    The User Agent capabilities specification allows Session Initiation
>>    Protocol (SIP) User Agents to convey their capabilities and
>>    characteristics to other User Agents and to the registrar for its
>>    domain.  This information is conveyed as parameters of the Contact
>>    header field.  Amongst those capabilities are the type of User Agent
>>    that is available at a SIP Uniform Resource Identifier (URI).  This
>>    document extends the User Agent capabilities specification to allow
>>    indication of Back-to-Back User Agent (B2BUA) types.
>>
>>
>>
>>
>>
>> Please note that it may take a couple of minutes from the time of=20
>> submission until the htmlized version and diff are available at=20
>> tools.ietf.org.
>>
>> The IETF Secretariat
>>
>
> _______________________________________________
> straw mailing list
> straw@ietf.org
> https://www.ietf.org/mailman/listinfo/straw
>

_______________________________________________
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https://www.ietf.org/mailman/listinfo/straw


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From: Christer Holmberg <christer.holmberg@ericsson.com>
To: "straw@ietf.org" <straw@ietf.org>
Thread-Topic: [Technical Errata Reported] RFC7584 (4413)
Thread-Index: AQHQuxFR0FLeUkpyskyx+tZOuEuc5p3Y+9cQ
Date: Mon, 13 Jul 2015 07:07:15 +0000
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Subject: [straw] FW: [Technical Errata Reported] RFC7584 (4413)
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(As co-chair)

Hi,

The errata below, and the suggested correction, seem valid to me.

So, unless someone objects, we intend to accept it.

Regards,

Christer & Victor


-----Original Message-----
From: RFC Errata System [mailto:rfc-editor@rfc-editor.org]=20
Sent: 10. hein=E4kuuta 2015 16:03
To: rmohanr@cisco.com; tireddy@cisco.com; gsalguei@cisco.com; ben@nostrum.c=
om; alissa@cooperw.in; barryleiba@computer.org; Christer Holmberg; victor.p=
ascual.avila@gmail.com
Cc: brett@broadsoft.com; straw@ietf.org; rfc-editor@rfc-editor.org
Subject: [Technical Errata Reported] RFC7584 (4413)

The following errata report has been submitted for RFC7584, "Session Traver=
sal Utilities for NAT (STUN) Message Handling for SIP Back-to-Back User Age=
nts (B2BUAs)".

--------------------------------------
You may review the report below and at:
http://www.rfc-editor.org/errata_search.php?rfc=3D7584&eid=3D4413

--------------------------------------
Type: Technical
Reported by: Brett Tate <brett@broadsoft.com>

Section: 4.4

Original Text
-------------
   Because of forking, a B2BUA might receive multiple answers for a
   single outbound INVITE.  When this occurs, the B2BUA SHOULD follow
   Sections 3.2 or 3.3 for all of those received answers.

Corrected Text
--------------
   Because of forking, a B2BUA might receive multiple answers for a
   single outbound INVITE.  When this occurs, the B2BUA SHOULD follow
   Sections 4.2 or 4.3 for all of those received answers.

Notes
-----
Sections 3.2 and 3.3 do not exist.  The normative statement should indicate=
 sections 4.2 and 4.3.

Instructions:
-------------
This erratum is currently posted as "Reported". If necessary, please use "R=
eply All" to discuss whether it should be verified or rejected. When a deci=
sion is reached, the verifying party (IESG) can log in to change the status=
 and edit the report, if necessary.=20

--------------------------------------
RFC7584 (draft-ietf-straw-b2bua-stun-08)
--------------------------------------
Title               : Session Traversal Utilities for NAT (STUN) Message Ha=
ndling for SIP Back-to-Back User Agents (B2BUAs)
Publication Date    : July 2015
Author(s)           : R. Ravindranath, T. Reddy, G. Salgueiro
Category            : PROPOSED STANDARD
Source              : Sip Traversal Required for Applications to Work
Area                : Applications and Real-Time
Stream              : IETF
Verifying Party     : IESG


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From: "Ram Mohan R (rmohanr)" <rmohanr@cisco.com>
To: Christer Holmberg <christer.holmberg@ericsson.com>, "straw@ietf.org" <straw@ietf.org>
Thread-Topic: [straw] FW: [Technical Errata Reported] RFC7584 (4413)
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Subject: Re: [straw] FW: [Technical Errata Reported] RFC7584 (4413)
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Agree. It needs to be fixed.

Ram

-----Original Message-----
From: straw <straw-bounces@ietf.org> on behalf of Christer Holmberg
<christer.holmberg@ericsson.com>
Date: Monday, 13 July 2015 12:37 pm
To: "straw@ietf.org" <straw@ietf.org>
Subject: [straw] FW: [Technical Errata Reported] RFC7584 (4413)

>(As co-chair)
>
>Hi,
>
>The errata below, and the suggested correction, seem valid to me.
>
>So, unless someone objects, we intend to accept it.
>
>Regards,
>
>Christer & Victor
>
>
>-----Original Message-----
>From: RFC Errata System [mailto:rfc-editor@rfc-editor.org]
>Sent: 10. hein=E4kuuta 2015 16:03
>To: rmohanr@cisco.com; tireddy@cisco.com; gsalguei@cisco.com;
>ben@nostrum.com; alissa@cooperw.in; barryleiba@computer.org; Christer
>Holmberg; victor.pascual.avila@gmail.com
>Cc: brett@broadsoft.com; straw@ietf.org; rfc-editor@rfc-editor.org
>Subject: [Technical Errata Reported] RFC7584 (4413)
>
>The following errata report has been submitted for RFC7584, "Session
>Traversal Utilities for NAT (STUN) Message Handling for SIP Back-to-Back
>User Agents (B2BUAs)".
>
>--------------------------------------
>You may review the report below and at:
>http://www.rfc-editor.org/errata_search.php?rfc=3D7584&eid=3D4413
>
>--------------------------------------
>Type: Technical
>Reported by: Brett Tate <brett@broadsoft.com>
>
>Section: 4.4
>
>Original Text
>-------------
>   Because of forking, a B2BUA might receive multiple answers for a
>   single outbound INVITE.  When this occurs, the B2BUA SHOULD follow
>   Sections 3.2 or 3.3 for all of those received answers.
>
>Corrected Text
>--------------
>   Because of forking, a B2BUA might receive multiple answers for a
>   single outbound INVITE.  When this occurs, the B2BUA SHOULD follow
>   Sections 4.2 or 4.3 for all of those received answers.
>
>Notes
>-----
>Sections 3.2 and 3.3 do not exist.  The normative statement should
>indicate sections 4.2 and 4.3.
>
>Instructions:
>-------------
>This erratum is currently posted as "Reported". If necessary, please use
>"Reply All" to discuss whether it should be verified or rejected. When a
>decision is reached, the verifying party (IESG) can log in to change the
>status and edit the report, if necessary.
>
>--------------------------------------
>RFC7584 (draft-ietf-straw-b2bua-stun-08)
>--------------------------------------
>Title               : Session Traversal Utilities for NAT (STUN) Message
>Handling for SIP Back-to-Back User Agents (B2BUAs)
>Publication Date    : July 2015
>Author(s)           : R. Ravindranath, T. Reddy, G. Salgueiro
>Category            : PROPOSED STANDARD
>Source              : Sip Traversal Required for Applications to Work
>Area                : Applications and Real-Time
>Stream              : IETF
>Verifying Party     : IESG
>
>_______________________________________________
>straw mailing list
>straw@ietf.org
>https://www.ietf.org/mailman/listinfo/straw


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The following errata report has been verified for RFC7584,
"Session Traversal Utilities for NAT (STUN) Message Handling for SIP Back-to-Back User Agents (B2BUAs)". 

--------------------------------------
You may review the report below and at:
http://www.rfc-editor.org/errata_search.php?rfc=7584&eid=4413

--------------------------------------
Status: Verified
Type: Technical

Reported by: Brett Tate <brett@broadsoft.com>
Date Reported: 2015-07-10
Verified by: Ben Campbell (IESG)

Section: 4.4

Original Text
-------------
   Because of forking, a B2BUA might receive multiple answers for a
   single outbound INVITE.  When this occurs, the B2BUA SHOULD follow
   Sections 3.2 or 3.3 for all of those received answers.

Corrected Text
--------------
   Because of forking, a B2BUA might receive multiple answers for a
   single outbound INVITE.  When this occurs, the B2BUA SHOULD follow
   Sections 4.2 or 4.3 for all of those received answers.

Notes
-----
Sections 3.2 and 3.3 do not exist.  The normative statement should indicate sections 4.2 and 4.3.

--------------------------------------
RFC7584 (draft-ietf-straw-b2bua-stun-08)
--------------------------------------
Title               : Session Traversal Utilities for NAT (STUN) Message Handling for SIP Back-to-Back User Agents (B2BUAs)
Publication Date    : July 2015
Author(s)           : R. Ravindranath, T. Reddy, G. Salgueiro
Category            : PROPOSED STANDARD
Source              : Sip Traversal Required for Applications to Work
Area                : Applications and Real-Time
Stream              : IETF
Verifying Party     : IESG


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From: "Ram Mohan R (rmohanr)" <rmohanr@cisco.com>
To: Christer Holmberg <christer.holmberg@ericsson.com>, Paul Kyzivat <pkyzivat@alum.mit.edu>, "straw@ietf.org" <straw@ietf.org>
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References: <20150706143859.26484.14872.idtracker@ietfa.amsl.com> <D1C0A2A2.37309%rmohanr@cisco.com> <559AB12A.40604@alum.mit.edu> <7594FB04B1934943A5C02806D1A2204B1D913D83@ESESSMB209.ericsson.se>
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Subject: Re: [straw] FW: New Version Notification for draft-ram-straw-b2bua-feature-tag-00.txt
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HI Christer,

Please see inline

-----Original Message-----
From: straw <straw-bounces@ietf.org> on behalf of Christer Holmberg
<christer.holmberg@ericsson.com>
Date: Monday, 13 July 2015 8:25 am
To: Paul Kyzivat <pkyzivat@alum.mit.edu>, "straw@ietf.org" <straw@ietf.org>
Subject: Re: [straw] FW: New Version Notification for
draft-ram-straw-b2bua-feature-tag-00.txt

>(As individual)
>
>Hi,
>
>I more or less share the questions raised by Paul.
>
>Also, keep in mind that there might be multiple Contact modifying B2BUAs
>in the path, which means that any media feature tag(s) inserted by B2BUA
>#1 may be overwritten by B2BUA #2.

Agree.

>
>So, one question is: what information do you want to provide? If you want
>a list of *ALL* B2BUA types in the siganlling path then I think you would
>need another mechanism, e.g. a feature capability indicator (fci).

The idea is for the UA to know the types of B2BUA in the path between
itself and the destination. For e.g each B2BUA in the path would attach a
fci=20

>
>Another question is: do you want the information bound to the domain
>name/IP address of the B2BUA? If so, keep in mind that fcis by default do
>not indicate which entity the fci is associated with - only that there is
>*A* entity that that feature.

I think the need for domain / IP may not be needed. All we need to know is
the type of B2BUA in the path.

>
>So, I think it would be good to write down what the requirements are.
>Perhaps they can be parsed from the text, but it would be good to have
>them explicitly stated in a separate section.

Sure. Will revise the draft and add a requirement section.

Ram

>
>Thanks!
>
>Regards,
>
>Christer
>
>-----Original Message-----
>From: straw [mailto:straw-bounces@ietf.org] On Behalf Of Paul Kyzivat
>Sent: 6. hein=E4kuuta 2015 19:48
>To: straw@ietf.org
>Subject: Re: [straw] FW: New Version Notification for
>draft-ram-straw-b2bua-feature-tag-00.txt
>
>Ram,
>
>I am puzzled by this. I can't figure out when/how it would be used, or
>if/how it relates to RFC6809 (proxy-feature).
>
>My problem is fundamentally whether the devices carrying this tag are to
>be viewed as endpoints or intermediaries. For the properties being
>described to be useful, I think one must view the device as an
>intermediary, that is somehow masking/modifying the intrinsic properties
>of the *actual* endpoint. Yet feature tags (callee capabilities) should
>be viewed as describing the target of communication.
>
>RFC6809 provides a way of describing properties of intermediaries on the
>signaling (and potentially also the media) path. Perhaps this new
>property belongs there instead.
>
>Another way to use a B2BUA is for me, as a user, to use a B2BUA as a
>foundation to build a virtual user agent, composed of one or more other
>UAs. That seems to fit your model. But in that case, other UAs
>interacting with it don't need to know that it is a B2BUA. Rather, they
>only need to know what capabilities it presents to the world. The fact
>that it is a B2BUA is simply an implementation detail.
>
>	Thanks,
>	Paul
>
>On 7/6/15 12:07 PM, Ram Mohan R (rmohanr) wrote:
>> Hi All,
>>
>>   We have published a new draft that extends the User Agent
>> capabilities specification(RFC 3840) to allow
>>     indication of Back-to-Back User Agent (B2BUA) types.
>> The motivation for this draft came out  of IESG review and subsequent
>> discussions of [I-D.ietf-straw-b2bua-stun] where it was pointed that
>> there is no existing mechanisms for B2BUA to indicate its presence
>> except for special cases like Focus.
>>
>> Please review and provide your inputs.
>>
>> Regards,
>> Authors
>>
>> -----Original Message-----
>> From: "internet-drafts@ietf.org" <internet-drafts@ietf.org>
>> Date: Monday, 6 July 2015 8:08 pm
>> To: Cisco Employee <rmohanr@cisco.com>, "Tirumaleswar Reddy (tireddy)"
>> <tireddy@cisco.com>, "Gonzalo Salgueiro (gsalguei)"
>> <gsalguei@cisco.com>, "Gonzalo Salgueiro (gsalguei)"
>> <gsalguei@cisco.com>, "Tirumaleswar Reddy (tireddy)"
>> <tireddy@cisco.com>, Cisco Employee <rmohanr@cisco.com>
>> Subject: New Version Notification for
>> draft-ram-straw-b2bua-feature-tag-00.txt
>>
>>>
>>> A new version of I-D, draft-ram-straw-b2bua-feature-tag-00.txt
>>> has been successfully submitted by Ram Mohan Ravindranath and posted
>>> to the IETF repository.
>>>
>>> Name:		draft-ram-straw-b2bua-feature-tag
>>> Revision:	00
>>> Title:		A Session Initiation Protocol (SIP) Feature Tag for
>>>Back-to-Back
>>> User Agents (B2BUAs)
>>> Document date:	2015-07-06
>>> Group:		Individual Submission
>>> Pages:		8
>>> URL:
>>>=20
>>>https://www.ietf.org/internet-drafts/draft-ram-straw-b2bua-feature-tag-0
>>>0.
>>> txt
>>> Status:
>>> https://datatracker.ietf.org/doc/draft-ram-straw-b2bua-feature-tag/
>>> Htmlized:
>>> https://tools.ietf.org/html/draft-ram-straw-b2bua-feature-tag-00
>>>
>>>
>>> Abstract:
>>>    The User Agent capabilities specification allows Session Initiation
>>>    Protocol (SIP) User Agents to convey their capabilities and
>>>    characteristics to other User Agents and to the registrar for its
>>>    domain.  This information is conveyed as parameters of the Contact
>>>    header field.  Amongst those capabilities are the type of User Agent
>>>    that is available at a SIP Uniform Resource Identifier (URI).  This
>>>    document extends the User Agent capabilities specification to allow
>>>    indication of Back-to-Back User Agent (B2BUA) types.
>>>
>>>
>>>
>>>
>>>
>>> Please note that it may take a couple of minutes from the time of
>>> submission until the htmlized version and diff are available at
>>> tools.ietf.org.
>>>
>>> The IETF Secretariat
>>>
>>
>> _______________________________________________
>> straw mailing list
>> straw@ietf.org
>> https://www.ietf.org/mailman/listinfo/straw
>>
>
>_______________________________________________
>straw mailing list
>straw@ietf.org
>https://www.ietf.org/mailman/listinfo/straw
>
>_______________________________________________
>straw mailing list
>straw@ietf.org
>https://www.ietf.org/mailman/listinfo/straw


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From: "Ram Mohan R (rmohanr)" <rmohanr@cisco.com>
To: Paul Kyzivat <pkyzivat@alum.mit.edu>, "straw@ietf.org" <straw@ietf.org>
Thread-Topic: [straw] FW: New Version Notification for draft-ram-straw-b2bua-feature-tag-00.txt
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Hi Paul,

Sorry for delay. See inline

-----Original Message-----
From: straw <straw-bounces@ietf.org> on behalf of Paul Kyzivat
<pkyzivat@alum.mit.edu>
Date: Monday, 6 July 2015 6:47 pm
To: "straw@ietf.org" <straw@ietf.org>
Subject: Re: [straw] FW: New Version Notification for
draft-ram-straw-b2bua-feature-tag-00.txt

>Ram,
>
>I am puzzled by this. I can't figure out when/how it would be used, or
>if/how it relates to RFC6809 (proxy-feature).
>
>My problem is fundamentally whether the devices carrying this tag are to
>be viewed as endpoints or intermediaries.

These devices are primarily intermediary devices [ B2BUAs of types in RFC
7092].

> For the properties being
>described to be useful, I think one must view the device as an
>intermediary, that is somehow masking/modifying the intrinsic properties
>of the *actual* endpoint. Yet feature tags (callee capabilities) should
>be viewed as describing the target of communication.

Agree. Initially I had looked at RFC 3840 capabilities (some of them like
isFocus which is a special case of middle box terminating sessions) and
thought 3840 would fit in to indicate the B2BUA capabilities. After
reading RFC 6809 I think that is more relevant and each B2BUA in the path
can add a fci header with its type and so when the UA receives the INVITE
it will see the list of fci headers with the top most being the closest to
UA receiving the message.

The goal of this draft is for a UA to know the different types of B2BUA [
with in the scope of RFC 7092 types] between itself and the destination.
What the UA does by looking at the type of B2BUA is not in scope here.

Ram
>
>RFC6809 provides a way of describing properties of intermediaries on the
>signaling (and potentially also the media) path. Perhaps this new
>property belongs there instead.
>
>Another way to use a B2BUA is for me, as a user, to use a B2BUA as a
>foundation to build a virtual user agent, composed of one or more other
>UAs. That seems to fit your model. But in that case, other UAs
>interacting with it don't need to know that it is a B2BUA. Rather, they
>only need to know what capabilities it presents to the world. The fact
>that it is a B2BUA is simply an implementation detail.
>
>	Thanks,
>	Paul
>
>On 7/6/15 12:07 PM, Ram Mohan R (rmohanr) wrote:
>> Hi All,
>>
>>   We have published a new draft that extends the User Agent capabilities
>> specification(RFC 3840) to allow
>>     indication of Back-to-Back User Agent (B2BUA) types.
>> The motivation for this draft came out  of IESG review and subsequent
>> discussions of [I-D.ietf-straw-b2bua-stun] where it was pointed
>> that there is no existing mechanisms for B2BUA to indicate its presence
>> except for special cases like Focus.
>>
>> Please review and provide your inputs.
>>
>> Regards,
>> Authors
>>
>> -----Original Message-----
>> From: "internet-drafts@ietf.org" <internet-drafts@ietf.org>
>> Date: Monday, 6 July 2015 8:08 pm
>> To: Cisco Employee <rmohanr@cisco.com>, "Tirumaleswar Reddy (tireddy)"
>> <tireddy@cisco.com>, "Gonzalo Salgueiro (gsalguei)"
>><gsalguei@cisco.com>,
>> "Gonzalo Salgueiro (gsalguei)" <gsalguei@cisco.com>, "Tirumaleswar Reddy
>> (tireddy)" <tireddy@cisco.com>, Cisco Employee <rmohanr@cisco.com>
>> Subject: New Version Notification for
>> draft-ram-straw-b2bua-feature-tag-00.txt
>>
>>>
>>> A new version of I-D, draft-ram-straw-b2bua-feature-tag-00.txt
>>> has been successfully submitted by Ram Mohan Ravindranath and posted to
>>> the
>>> IETF repository.
>>>
>>> Name:		draft-ram-straw-b2bua-feature-tag
>>> Revision:	00
>>> Title:		A Session Initiation Protocol (SIP) Feature Tag for
>>>Back-to-Back
>>> User Agents (B2BUAs)
>>> Document date:	2015-07-06
>>> Group:		Individual Submission
>>> Pages:		8
>>> URL:
>>>=20
>>>https://www.ietf.org/internet-drafts/draft-ram-straw-b2bua-feature-tag-0
>>>0.
>>> txt
>>> Status:
>>> https://datatracker.ietf.org/doc/draft-ram-straw-b2bua-feature-tag/
>>> Htmlized:
>>> https://tools.ietf.org/html/draft-ram-straw-b2bua-feature-tag-00
>>>
>>>
>>> Abstract:
>>>    The User Agent capabilities specification allows Session Initiation
>>>    Protocol (SIP) User Agents to convey their capabilities and
>>>    characteristics to other User Agents and to the registrar for its
>>>    domain.  This information is conveyed as parameters of the Contact
>>>    header field.  Amongst those capabilities are the type of User Agent
>>>    that is available at a SIP Uniform Resource Identifier (URI).  This
>>>    document extends the User Agent capabilities specification to allow
>>>    indication of Back-to-Back User Agent (B2BUA) types.
>>>
>>>
>>>
>>>
>>>
>>> Please note that it may take a couple of minutes from the time of
>>> submission
>>> until the htmlized version and diff are available at tools.ietf.org.
>>>
>>> The IETF Secretariat
>>>
>>
>> _______________________________________________
>> straw mailing list
>> straw@ietf.org
>> https://www.ietf.org/mailman/listinfo/straw
>>
>
>_______________________________________________
>straw mailing list
>straw@ietf.org
>https://www.ietf.org/mailman/listinfo/straw


From nobody Mon Jul 20 05:34:39 2015
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From: "Ram Mohan R (rmohanr)" <rmohanr@cisco.com>
To: "straw@ietf.org" <straw@ietf.org>
Thread-Topic: [straw] I-D Action: draft-ietf-straw-b2bua-dtls-srtp-03.txt
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--_003_D1D2B2F438D39rmohanrciscocom_
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Updated the DTLS-SRTP B2BUA draft with few more comments from discussions
with Stephen.  Attached is the diff.
Please review and let me know if its ok.

Ram

-----Original Message-----
From: straw <straw-bounces@ietf.org> on behalf of Cisco Employee
<rmohanr@cisco.com>
Date: Thursday, 18 June 2015 11:36 am
To: "straw@ietf.org" <straw@ietf.org>
Subject: Re: [straw] I-D Action: draft-ietf-straw-b2bua-dtls-srtp-03.txt

>This version addresses comments from Christer and Simon.
>
>Cheers,
>Ram
>
>-----Original Message-----
>From: "internet-drafts@ietf.org" <internet-drafts@ietf.org>
>Date: Thursday, 18 June 2015 3:04 pm
>To: "i-d-announce@ietf.org" <i-d-announce@ietf.org>
>Cc: "straw@ietf.org" <straw@ietf.org>
>Subject: [straw] I-D Action: draft-ietf-straw-b2bua-dtls-srtp-03.txt
>
>>
>>A New Internet-Draft is available from the on-line Internet-Drafts
>>directories.
>> This draft is a work item of the Sip Traversal Required for Applications
>>to Work Working Group of the IETF.
>>
>>        Title           : DTLS-SRTP Handling in Session Initiation
>>Protocol (SIP) Back-to-Back User Agents (B2BUAs)
>>        Authors         : Ram Mohan Ravindranath
>>                          Tirumaleswar Reddy
>>                          Gonzalo Salgueiro
>>                          Victor Pascual
>>                          Parthasarathi Ravindran
>>	Filename        : draft-ietf-straw-b2bua-dtls-srtp-03.txt
>>	Pages           : 10
>>	Date            : 2015-06-18
>>
>>Abstract:
>>   Session Initiation Protocol (SIP) Back-to-Back User Agents (B2BUAs)
>>   often function on the media plane, rather than just on the signaling
>>   path.  This document describes the behavior B2BUAs should follow when
>>   acting on the media plane that use Secure Real-time Transport (SRTP)
>>   security context setup with Datagram Transport Layer Security (DTLS)
>>   protocol.
>>
>>
>>The IETF datatracker status page for this draft is:
>>https://datatracker.ietf.org/doc/draft-ietf-straw-b2bua-dtls-srtp/
>>
>>There's also a htmlized version available at:
>>https://tools.ietf.org/html/draft-ietf-straw-b2bua-dtls-srtp-03
>>
>>A diff from the previous version is available at:
>>https://www.ietf.org/rfcdiff?url2=3Ddraft-ietf-straw-b2bua-dtls-srtp-03
>>
>>
>>Please note that it may take a couple of minutes from the time of
>>submission
>>until the htmlized version and diff are available at tools.ietf.org.
>>
>>Internet-Drafts are also available by anonymous FTP at:
>>ftp://ftp.ietf.org/internet-drafts/
>>
>>_______________________________________________
>>straw mailing list
>>straw@ietf.org
>>https://www.ietf.org/mailman/listinfo/straw
>
>_______________________________________________
>straw mailing list
>straw@ietf.org
>https://www.ietf.org/mailman/listinfo/straw


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--_003_D1D2B2F438D39rmohanrciscocom_--


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Subject: [straw] I-D Action: draft-ietf-straw-b2bua-dtls-srtp-04.txt
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A New Internet-Draft is available from the on-line Internet-Drafts directories.
 This draft is a work item of the Sip Traversal Required for Applications to Work Working Group of the IETF.

        Title           : DTLS-SRTP Handling in Session Initiation Protocol (SIP) Back-to-Back User Agents (B2BUAs)
        Authors         : Ram Mohan Ravindranath
                          Tirumaleswar Reddy
                          Gonzalo Salgueiro
                          Victor Pascual
                          Parthasarathi Ravindran
	Filename        : draft-ietf-straw-b2bua-dtls-srtp-04.txt
	Pages           : 11
	Date            : 2015-07-22

Abstract:
   Session Initiation Protocol (SIP) Back-to-Back User Agents (B2BUAs)
   often function on the media plane, rather than just on the signaling
   path.  This document describes the behavior B2BUAs should follow when
   acting on the media plane that use Secure Real-time Transport (SRTP)
   security context setup with Datagram Transport Layer Security (DTLS)
   protocol.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-straw-b2bua-dtls-srtp/

There's also a htmlized version available at:
https://tools.ietf.org/html/draft-ietf-straw-b2bua-dtls-srtp-04

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-straw-b2bua-dtls-srtp-04


Please note that it may take a couple of minutes from the time of submission
until the htmlized version and diff are available at tools.ietf.org.

Internet-Drafts are also available by anonymous FTP at:
ftp://ftp.ietf.org/internet-drafts/


From nobody Fri Jul 31 08:16:50 2015
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Subject: Re: [straw] FW: New Version Notification for draft-ram-straw-b2bua-feature-tag-00.txt
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Hi Ram

I agree that B2BUA can multiple roles for different scenarios - but it 
could also play multiple roles for a particular scenario - like for a 
particular session, it could play the role of both signaling and media 
relay. Then both need to be indicated. So then the syntax could be

Contact: <sip:b2bua1@host.example.com>;audio;video;
          methods="INVITE,BYE,OPTIONS,ACK,CANCEL";
          +sip.isSignalingB2BUA, +sip.isMediaAwareRelayB2BUA


This means that the B2BUA can act as both signaling and media relay for 
this scenario and also shows its capabilities to act as both.

Regards
Ranjit

On 2015-07-20 6:52 am, Ram Mohan R (rmohanr) wrote:
> Hi Paul,
> 
> Sorry for delay. See inline
> 
> -----Original Message-----
> From: straw <straw-bounces@ietf.org> on behalf of Paul Kyzivat
> <pkyzivat@alum.mit.edu>
> Date: Monday, 6 July 2015 6:47 pm
> To: "straw@ietf.org" <straw@ietf.org>
> Subject: Re: [straw] FW: New Version Notification for
> draft-ram-straw-b2bua-feature-tag-00.txt
> 
>> Ram,
>> 
>> I am puzzled by this. I can't figure out when/how it would be used, or
>> if/how it relates to RFC6809 (proxy-feature).
>> 
>> My problem is fundamentally whether the devices carrying this tag are 
>> to
>> be viewed as endpoints or intermediaries.
> 
> These devices are primarily intermediary devices [ B2BUAs of types in 
> RFC
> 7092].
> 
>> For the properties being
>> described to be useful, I think one must view the device as an
>> intermediary, that is somehow masking/modifying the intrinsic 
>> properties
>> of the *actual* endpoint. Yet feature tags (callee capabilities) 
>> should
>> be viewed as describing the target of communication.
> 
> Agree. Initially I had looked at RFC 3840 capabilities (some of them 
> like
> isFocus which is a special case of middle box terminating sessions) and
> thought 3840 would fit in to indicate the B2BUA capabilities. After
> reading RFC 6809 I think that is more relevant and each B2BUA in the 
> path
> can add a fci header with its type and so when the UA receives the 
> INVITE
> it will see the list of fci headers with the top most being the closest 
> to
> UA receiving the message.
> 
> The goal of this draft is for a UA to know the different types of B2BUA 
> [
> with in the scope of RFC 7092 types] between itself and the 
> destination.
> What the UA does by looking at the type of B2BUA is not in scope here.
> 
> Ram
>> 
>> RFC6809 provides a way of describing properties of intermediaries on 
>> the
>> signaling (and potentially also the media) path. Perhaps this new
>> property belongs there instead.
>> 
>> Another way to use a B2BUA is for me, as a user, to use a B2BUA as a
>> foundation to build a virtual user agent, composed of one or more 
>> other
>> UAs. That seems to fit your model. But in that case, other UAs
>> interacting with it don't need to know that it is a B2BUA. Rather, 
>> they
>> only need to know what capabilities it presents to the world. The fact
>> that it is a B2BUA is simply an implementation detail.
>> 
>> 	Thanks,
>> 	Paul
>> 
>> On 7/6/15 12:07 PM, Ram Mohan R (rmohanr) wrote:
>>> Hi All,
>>> 
>>>   We have published a new draft that extends the User Agent 
>>> capabilities
>>> specification(RFC 3840) to allow
>>>     indication of Back-to-Back User Agent (B2BUA) types.
>>> The motivation for this draft came out  of IESG review and subsequent
>>> discussions of [I-D.ietf-straw-b2bua-stun] where it was pointed
>>> that there is no existing mechanisms for B2BUA to indicate its 
>>> presence
>>> except for special cases like Focus.
>>> 
>>> Please review and provide your inputs.
>>> 
>>> Regards,
>>> Authors
>>> 
>>> -----Original Message-----
>>> From: "internet-drafts@ietf.org" <internet-drafts@ietf.org>
>>> Date: Monday, 6 July 2015 8:08 pm
>>> To: Cisco Employee <rmohanr@cisco.com>, "Tirumaleswar Reddy 
>>> (tireddy)"
>>> <tireddy@cisco.com>, "Gonzalo Salgueiro (gsalguei)"
>>> <gsalguei@cisco.com>,
>>> "Gonzalo Salgueiro (gsalguei)" <gsalguei@cisco.com>, "Tirumaleswar 
>>> Reddy
>>> (tireddy)" <tireddy@cisco.com>, Cisco Employee <rmohanr@cisco.com>
>>> Subject: New Version Notification for
>>> draft-ram-straw-b2bua-feature-tag-00.txt
>>> 
>>>> 
>>>> A new version of I-D, draft-ram-straw-b2bua-feature-tag-00.txt
>>>> has been successfully submitted by Ram Mohan Ravindranath and posted 
>>>> to
>>>> the
>>>> IETF repository.
>>>> 
>>>> Name:		draft-ram-straw-b2bua-feature-tag
>>>> Revision:	00
>>>> Title:		A Session Initiation Protocol (SIP) Feature Tag for
>>>> Back-to-Back
>>>> User Agents (B2BUAs)
>>>> Document date:	2015-07-06
>>>> Group:		Individual Submission
>>>> Pages:		8
>>>> URL:
>>>> 
>>>> https://www.ietf.org/internet-drafts/draft-ram-straw-b2bua-feature-tag-0
>>>> 0.
>>>> txt
>>>> Status:
>>>> https://datatracker.ietf.org/doc/draft-ram-straw-b2bua-feature-tag/
>>>> Htmlized:
>>>> https://tools.ietf.org/html/draft-ram-straw-b2bua-feature-tag-00
>>>> 
>>>> 
>>>> Abstract:
>>>>    The User Agent capabilities specification allows Session 
>>>> Initiation
>>>>    Protocol (SIP) User Agents to convey their capabilities and
>>>>    characteristics to other User Agents and to the registrar for its
>>>>    domain.  This information is conveyed as parameters of the 
>>>> Contact
>>>>    header field.  Amongst those capabilities are the type of User 
>>>> Agent
>>>>    that is available at a SIP Uniform Resource Identifier (URI).  
>>>> This
>>>>    document extends the User Agent capabilities specification to 
>>>> allow
>>>>    indication of Back-to-Back User Agent (B2BUA) types.
>>>> 
>>>> 
>>>> 
>>>> 
>>>> 
>>>> Please note that it may take a couple of minutes from the time of
>>>> submission
>>>> until the htmlized version and diff are available at tools.ietf.org.
>>>> 
>>>> The IETF Secretariat
>>>> 
>>> 
>>> _______________________________________________
>>> straw mailing list
>>> straw@ietf.org
>>> https://www.ietf.org/mailman/listinfo/straw
>>> 
>> 
>> _______________________________________________
>> straw mailing list
>> straw@ietf.org
>> https://www.ietf.org/mailman/listinfo/straw
> 
> _______________________________________________
> straw mailing list
> straw@ietf.org
> https://www.ietf.org/mailman/listinfo/straw


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From: "Ram Mohan R (rmohanr)" <rmohanr@cisco.com>
To: "ranjit@ranjitvoip.com" <ranjit@ranjitvoip.com>
Thread-Topic: [straw] FW: New Version Notification for draft-ram-straw-b2bua-feature-tag-00.txt
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Subject: Re: [straw] FW: New Version Notification for draft-ram-straw-b2bua-feature-tag-00.txt
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Hi Ranjit,

Agree. There can be multiple roles for B2BUA and hence different
capabilities.

Ram

-----Original Message-----
From: "ranjit@ranjitvoip.com" <ranjit@ranjitvoip.com>
Date: Friday, 31 July 2015 8:46 pm
To: Cisco Employee <rmohanr@cisco.com>
Cc: Paul Kyzivat <pkyzivat@alum.mit.edu>, "straw@ietf.org" <straw@ietf.org>
Subject: Re: [straw] FW: New Version Notification for
draft-ram-straw-b2bua-feature-tag-00.txt

>Hi Ram
>
>I agree that B2BUA can multiple roles for different scenarios - but it
>could also play multiple roles for a particular scenario - like for a
>particular session, it could play the role of both signaling and media
>relay. Then both need to be indicated. So then the syntax could be
>
>Contact: <sip:b2bua1@host.example.com>;audio;video;
>          methods=3D"INVITE,BYE,OPTIONS,ACK,CANCEL";
>          +sip.isSignalingB2BUA, +sip.isMediaAwareRelayB2BUA
>
>
>This means that the B2BUA can act as both signaling and media relay for
>this scenario and also shows its capabilities to act as both.
>
>Regards
>Ranjit
>
>On 2015-07-20 6:52 am, Ram Mohan R (rmohanr) wrote:
>> Hi Paul,
>>=20
>> Sorry for delay. See inline
>>=20
>> -----Original Message-----
>> From: straw <straw-bounces@ietf.org> on behalf of Paul Kyzivat
>> <pkyzivat@alum.mit.edu>
>> Date: Monday, 6 July 2015 6:47 pm
>> To: "straw@ietf.org" <straw@ietf.org>
>> Subject: Re: [straw] FW: New Version Notification for
>> draft-ram-straw-b2bua-feature-tag-00.txt
>>=20
>>> Ram,
>>>=20
>>> I am puzzled by this. I can't figure out when/how it would be used, or
>>> if/how it relates to RFC6809 (proxy-feature).
>>>=20
>>> My problem is fundamentally whether the devices carrying this tag are
>>> to
>>> be viewed as endpoints or intermediaries.
>>=20
>> These devices are primarily intermediary devices [ B2BUAs of types in
>> RFC
>> 7092].
>>=20
>>> For the properties being
>>> described to be useful, I think one must view the device as an
>>> intermediary, that is somehow masking/modifying the intrinsic
>>> properties
>>> of the *actual* endpoint. Yet feature tags (callee capabilities)
>>> should
>>> be viewed as describing the target of communication.
>>=20
>> Agree. Initially I had looked at RFC 3840 capabilities (some of them
>> like
>> isFocus which is a special case of middle box terminating sessions) and
>> thought 3840 would fit in to indicate the B2BUA capabilities. After
>> reading RFC 6809 I think that is more relevant and each B2BUA in the
>> path
>> can add a fci header with its type and so when the UA receives the
>> INVITE
>> it will see the list of fci headers with the top most being the closest
>> to
>> UA receiving the message.
>>=20
>> The goal of this draft is for a UA to know the different types of B2BUA
>> [
>> with in the scope of RFC 7092 types] between itself and the
>> destination.
>> What the UA does by looking at the type of B2BUA is not in scope here.
>>=20
>> Ram
>>>=20
>>> RFC6809 provides a way of describing properties of intermediaries on
>>> the
>>> signaling (and potentially also the media) path. Perhaps this new
>>> property belongs there instead.
>>>=20
>>> Another way to use a B2BUA is for me, as a user, to use a B2BUA as a
>>> foundation to build a virtual user agent, composed of one or more
>>> other
>>> UAs. That seems to fit your model. But in that case, other UAs
>>> interacting with it don't need to know that it is a B2BUA. Rather,
>>> they
>>> only need to know what capabilities it presents to the world. The fact
>>> that it is a B2BUA is simply an implementation detail.
>>>=20
>>> 	Thanks,
>>> 	Paul
>>>=20
>>> On 7/6/15 12:07 PM, Ram Mohan R (rmohanr) wrote:
>>>> Hi All,
>>>>=20
>>>>   We have published a new draft that extends the User Agent
>>>> capabilities
>>>> specification(RFC 3840) to allow
>>>>     indication of Back-to-Back User Agent (B2BUA) types.
>>>> The motivation for this draft came out  of IESG review and subsequent
>>>> discussions of [I-D.ietf-straw-b2bua-stun] where it was pointed
>>>> that there is no existing mechanisms for B2BUA to indicate its
>>>> presence
>>>> except for special cases like Focus.
>>>>=20
>>>> Please review and provide your inputs.
>>>>=20
>>>> Regards,
>>>> Authors
>>>>=20
>>>> -----Original Message-----
>>>> From: "internet-drafts@ietf.org" <internet-drafts@ietf.org>
>>>> Date: Monday, 6 July 2015 8:08 pm
>>>> To: Cisco Employee <rmohanr@cisco.com>, "Tirumaleswar Reddy
>>>> (tireddy)"
>>>> <tireddy@cisco.com>, "Gonzalo Salgueiro (gsalguei)"
>>>> <gsalguei@cisco.com>,
>>>> "Gonzalo Salgueiro (gsalguei)" <gsalguei@cisco.com>, "Tirumaleswar
>>>> Reddy
>>>> (tireddy)" <tireddy@cisco.com>, Cisco Employee <rmohanr@cisco.com>
>>>> Subject: New Version Notification for
>>>> draft-ram-straw-b2bua-feature-tag-00.txt
>>>>=20
>>>>>=20
>>>>> A new version of I-D, draft-ram-straw-b2bua-feature-tag-00.txt
>>>>> has been successfully submitted by Ram Mohan Ravindranath and posted
>>>>> to
>>>>> the
>>>>> IETF repository.
>>>>>=20
>>>>> Name:		draft-ram-straw-b2bua-feature-tag
>>>>> Revision:	00
>>>>> Title:		A Session Initiation Protocol (SIP) Feature Tag for
>>>>> Back-to-Back
>>>>> User Agents (B2BUAs)
>>>>> Document date:	2015-07-06
>>>>> Group:		Individual Submission
>>>>> Pages:		8
>>>>> URL:
>>>>>=20
>>>>>=20
>>>>>https://www.ietf.org/internet-drafts/draft-ram-straw-b2bua-feature-tag
>>>>>-0
>>>>> 0.
>>>>> txt
>>>>> Status:
>>>>> https://datatracker.ietf.org/doc/draft-ram-straw-b2bua-feature-tag/
>>>>> Htmlized:
>>>>> https://tools.ietf.org/html/draft-ram-straw-b2bua-feature-tag-00
>>>>>=20
>>>>>=20
>>>>> Abstract:
>>>>>    The User Agent capabilities specification allows Session
>>>>> Initiation
>>>>>    Protocol (SIP) User Agents to convey their capabilities and
>>>>>    characteristics to other User Agents and to the registrar for its
>>>>>    domain.  This information is conveyed as parameters of the
>>>>> Contact
>>>>>    header field.  Amongst those capabilities are the type of User
>>>>> Agent
>>>>>    that is available at a SIP Uniform Resource Identifier (URI).
>>>>> This
>>>>>    document extends the User Agent capabilities specification to
>>>>> allow
>>>>>    indication of Back-to-Back User Agent (B2BUA) types.
>>>>>=20
>>>>>=20
>>>>>=20
>>>>>=20
>>>>>=20
>>>>> Please note that it may take a couple of minutes from the time of
>>>>> submission
>>>>> until the htmlized version and diff are available at tools.ietf.org.
>>>>>=20
>>>>> The IETF Secretariat
>>>>>=20
>>>>=20
>>>> _______________________________________________
>>>> straw mailing list
>>>> straw@ietf.org
>>>> https://www.ietf.org/mailman/listinfo/straw
>>>>=20
>>>=20
>>> _______________________________________________
>>> straw mailing list
>>> straw@ietf.org
>>> https://www.ietf.org/mailman/listinfo/straw
>>=20
>> _______________________________________________
>> straw mailing list
>> straw@ietf.org
>> https://www.ietf.org/mailman/listinfo/straw
>

