Re: [MMUSIC] Draft new version: draft-ietf-mmusic-mux-exclusive-11

Eric Rescorla <ekr@rtfm.com> Sat, 18 February 2017 19:44 UTC

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From: Eric Rescorla <ekr@rtfm.com>
Date: Sat, 18 Feb 2017 11:43:43 -0800
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To: Paul Kyzivat <paul.kyzivat@comcast.net>
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Subject: Re: [MMUSIC] Draft new version: draft-ietf-mmusic-mux-exclusive-11
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On Fri, Feb 17, 2017 at 9:04 AM, Paul Kyzivat <paul.kyzivat@comcast.net>
wrote:

> On 2/17/17 3:46 AM, Christer Holmberg wrote:
>
>> Hi,
>>
>> Based on the comments from Ekr, I've submitted a new version of
>> draft-mux-exclusive.
>>
>> The SDP 'rtcp-mux-only' attribute is now only allowed in SDP offers.
>>
>
> With the new text the offerer never knows if the answerer supports
> rtcp-mux-only. He only knows that the answerer supports rtcp-mux.
>

Yes.


I don't think this matters for that O/A, but it might matter for subsequent
> O/As.
>

Why?

-Ekjr


> At the least, I think section 4.5 is now confusing. For m-lines previously
> negotiated with rtcp-mux-only, must the side that is sending a new offer
> include the attribute again, while the side that is answering must *not*
> include it? (Note the implications when the new offer is in the opposite
> direction from the original one.) I think this will be somewhat of a pain -
> perhaps more pain than simply always including it in all offers and answers.
>
>         Thanks,
>         Paul
>
>
> Regards,
>>
>> Christer
>>
>>
>> -----Original Message-----
>> From: mmusic [mailto:mmusic-bounces@ietf.org] On Behalf Of
>> internet-drafts@ietf.org
>> Sent: 17 February 2017 10:44
>> To: i-d-announce@ietf.org
>> Cc: mmusic@ietf.org
>> Subject: [MMUSIC] I-D Action: draft-ietf-mmusic-mux-exclusive-11.txt
>>
>>
>> A New Internet-Draft is available from the on-line Internet-Drafts
>> directories.
>> This draft is a work item of the Multiparty Multimedia Session Control of
>> the IETF.
>>
>>         Title           : Indicating Exclusive Support of RTP/RTCP
>> Multiplexing using SDP
>>         Author          : Christer Holmberg
>>         Filename        : draft-ietf-mmusic-mux-exclusive-11.txt
>>         Pages           : 12
>>         Date            : 2017-02-17
>>
>> Abstract:
>>    This document defines a new SDP media-level attribute, 'rtcp-mux-
>>    only', that can be used by an endpoint to indicate exclusive support
>>    of RTP/RTCP multiplexing.  The document also updates RFC 5761, by
>>    clarifying that an offerer can use a mechanism to indicate that it is
>>    not able to send and receive RTCP on separate ports.
>>
>>
>> The IETF datatracker status page for this draft is:
>> https://datatracker.ietf.org/doc/draft-ietf-mmusic-mux-exclusive/
>>
>> There's also a htmlized version available at:
>> https://tools.ietf.org/html/draft-ietf-mmusic-mux-exclusive-11
>>
>> A diff from the previous version is available at:
>> https://www.ietf.org/rfcdiff?url2=draft-ietf-mmusic-mux-exclusive-11
>>
>>
>> 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/
>>
>> _______________________________________________
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