Re: [MMUSIC] Comments on IESG Changes in the -cs draft ? [Fwd: Protocol Action: 'Session Description Protocol (SDP) Extension For Setting Audio and Video Media Streams Over Circuit-Switched Bearers In The Public Switched Telephone Network (PSTN)' to Proposed Standard (draft-ietf-mmusic-sdp-cs-21.txt)]

[Hadriel Kaplan <[e-mail]>]

I propose we remove the UUI and DTMF correlation options, and just leave it as the callerid one only for now.

We can leave the ABNF with the current 'ext-mech' so that a future spec could define something else if need be, and the IANA registration procedures for doing so are already documented in this draft-ietf-mmusic-sdp-cs-21.

-hadriel


On Aug 12, 2013, at 8:51 AM, Miguel A. Garcia <[e-mail]> wrote:

> Hi Hadriel:
> 
> As far as I remember, the history of the three mechanisms is kind of fuzzy. At some point in time in the past, 3GPP hadn't decided on the architecture to enable CS calls over SIP/SDP, and they were looking into it. The mechanisms were envisioned by the authors and comments on the mailing list, and put at 3GPP's disposal for a choice.
> 
> I concur with  your concern that just because we mandate to implement the 3 of them, these are not going to be implemented. I don't have any problem in removing from the draft those mechanisms that we envision they won't be used.
> 
> /Miguel
> 
> On 10/08/2013 1:28, Hadriel Kaplan wrote:
>> Wow.  I can kinda understand why they'd say that (interop reasons, presumably), but that's a big deal.  The 3 mechanisms are very different, with very different architectural and deployment implications.  I have a very hard time believing any of us would truly implement all three.  In fact, I don't truly believe anyone would.
>> 
>> So... I hate to do this, but can the authors summarize the history of how we got 3 mechanisms to begin with, and who would really implement them all?
>> 
>> Or to put it another way, instead of specifying all 3, would it be impossible to take a step back and reconsider the real motivating use-case (which as far as I know is 3GPP), and only specify the one they need/use?
>> 
>> -hadriel
>> 
>> 
>> On Aug 9, 2013, at 6:10 PM, Flemming Andreasen 
>> <[e-mail]>
>>  wrote:
>> 
>> 
>>> Greetings MMUSIC
>>> 
>>> As you can see per the below, the IESG approved the Circuit-Switched Bearers draft for publication, however before doing so, they requested a couple of changes. The resulting approved document can be found at 
>>> http://tools.ietf.org/html/draft-ietf-mmusic-sdp-cs-21
>>> 
>>> 
>>> One of the changes introduced resulted in all 3 correlation mechanisms now being mandatory-to-implement (previously they were not):
>>> <quote>
>>>    Implementations MUST support the three correlation mechanisms
>>>    specified in 
>>> Section 5.2.3.2, Section 5.2.3.3 and Section 5.2.3.4
>>> ,
>>>    and SHOULD include all supported mechanisms the initial Offer.
>>> 
>>> </quote>
>>> Since this is a non-trivial change that has not been discussed by the WG (and we know of at least one person having expressed concerns with it off-line), we are hereby solicting the WG participants for input on changes introduced as a result of the IESG review with a focus on the above. In doing so, please keep in mind that we are developing standards that work in the general Internet. 
>>> 
>>> 
>>> The following URL provides a diff-file showing the changes resulting from the IESG review:
>>>     
>>> http://tools.ietf.org/rfcdiff?url1=draft-ietf-mmusic-sdp-cs-18.txt&url2=draft-ietf-mmusic-sdp-cs-21.txt
>>> 
>>> 
>>> Comments are due by August 23 (two weeks from today)
>>> 
>>> Thanks 
>>> 
>>> -- Flemming (MMUSIC co-chair)
>>> 
>>> 
>>> 
>>> -------- Original Message --------
>>> Subject:	[MMUSIC] Protocol Action: 'Session Description Protocol (SDP) Extension For Setting Audio and Video Media Streams Over Circuit-Switched Bearers In The Public Switched Telephone Network (PSTN)' to Proposed Standard (draft-ietf-mmusic-sdp-cs-21.txt)
>>> Date:	Mon, 1 Jul 2013 11:56:23 -0700
>>> From:	The IESG 
>>> <[e-mail]>
>>> 
>>> To:	IETF-Announce 
>>> <[e-mail]>
>>> 
>>> CC:	mmusic chair 
>>> <[e-mail]>, mmusic mailing list <[e-mail]>, RFC Editor <[e-mail]>
>>> 
>>> 
>>> The IESG has approved the following document:
>>> - 'Session Description Protocol (SDP) Extension For Setting Audio and
>>>    Video Media Streams Over Circuit-Switched Bearers In The Public
>>>    Switched Telephone Network (PSTN)'
>>>   (draft-ietf-mmusic-sdp-cs-21.txt) as Proposed Standard
>>> 
>>> This document is the product of the Multiparty Multimedia Session Control
>>> Working Group.
>>> 
>>> The IESG contact persons are Gonzalo Camarillo and Richard Barnes.
>>> 
>>> A URL of this Internet Draft is:
>>> 
>>> 
>>> http://datatracker.ietf.org/doc/draft-ietf-mmusic-sdp-cs/
>>> 
>>> 
>>> 
>>> 
>>> 
>>> 
>>> *Technical Summary
>>> *
>>> 
>>> The document describes use cases, requirements, and protocol extensions
>>> for using the Session Description Protocol (SDP) Offer/Answer model for
>>> establishing audio and video media streams over circuit-switched bearers
>>> in the Publich Switched Telephone Network (PSTN)
>>> 
>>> *Working Group Summary
>>> *
>>> 
>>> The WG had some discussion around the format to use for E.164 numbers
>>> and whether to align this with the existing definition in RFC 3108. The
>>> RFC 3108 definition was seen as deficient and the WG agreed it was
>>> better to align with relevant parts of the tel URI format defined in RFC
>>> 3966, not least since SDP address types are defined in the context of a
>>> particular network type, and hence RFC 3108 compatibility is not a
>>> concern (the implication is that the "E164" address type may differ
>>> between network types in SDP).
>>> 
>>> *Document Quality
>>> *
>>> 
>>> There are currently no known implementations of the draft, however the
>>> draft is a dependency for 3GPP, so future implementations are expected.
>>> 
>>> The document has received good overall review in the WG, some of which
>>> resulted in changes to the detailed specification. The document has been
>>> reviewed in detail several times, including of the last few versions.
>>> The major contributors to these as well as earlier discussions are
>>> listed in the Acknowledgements section of the document.
>>> 
>>> 
>>> *Personnel
>>> *
>>> 
>>> Document Shepherd: Flemming Andreasen
>>> Responsible AD: Gonzalo Camarillo 
>>> _______________________________________________
>>> mmusic mailing list
>>> 
>>> 
>>> [e-mail]
>>> https://www.ietf.org/mailman/listinfo/mmusic
>>> 
>>> 
>>> .
>>> 
>>> 
>>> 
>>> 
>>> _______________________________________________
>>> mmusic mailing list
>>> 
>>> [e-mail]
>>> https://www.ietf.org/mailman/listinfo/mmusic
>> _______________________________________________
>> mmusic mailing list
>> 
>> [e-mail]
>> https://www.ietf.org/mailman/listinfo/mmusic
>> 
>> 
>> 
> 
> -- 
> Miguel A. Garcia
> [phone]
> Ericsson Spain
>