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Re: [MMUSIC] Benjamin Kaduk's Discuss on draft-ietf-mmusic-ice-sip-sdp-37: (with DISCUSS and COMMENT)

Christer Holmberg <christer.holmberg@ericsson.com> Wed, 07 August 2019 20:57 UTC

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From: Christer Holmberg <christer.holmberg@ericsson.com>
To: Benjamin Kaduk <kaduk@mit.edu>, Roman Shpount <roman@telurix.com>
CC: The IESG <iesg@ietf.org>, "fandreas@cisco.com" <fandreas@cisco.com>, "mmusic-chairs@ietf.org" <mmusic-chairs@ietf.org>, "mmusic@ietf.org" <mmusic@ietf.org>, "draft-ietf-mmusic-ice-sip-sdp@ietf.org" <draft-ietf-mmusic-ice-sip-sdp@ietf.org>
Thread-Topic: [MMUSIC] Benjamin Kaduk's Discuss on draft-ietf-mmusic-ice-sip-sdp-37: (with DISCUSS and COMMENT)
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Date: Wed, 07 Aug 2019 20:57:37 +0000
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Subject: Re: [MMUSIC] Benjamin Kaduk's Discuss on draft-ietf-mmusic-ice-sip-sdp-37: (with DISCUSS and COMMENT)
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Hi,

...

Section 3.2.2

>>>> Aren't "rtcp attribute SHOULD be included" and "rtcp attribute MAY
>>>> be omitted" just duplicating existing normative requirements
>>>> from previous specifications (which thus would not need new
>>>> normative language here)?
>>>
>>> Correct. The SHOULD and MAY shall not be normative. The MUST will
>>> remain, though.
>>
>> Part of the problem is that RFC 5245 section 4.3 (
>> https://tools.ietf.org/html/rfc5245#section-4.3) specified that a=rtcp
>> attribute MUST be included. This specification relaxes this
>> requirement and states that a=rtcp attribute SHOULD only be included
>> if separate port is used for RTCP and RTCP port is not RTP port plus
>> one. This language reverts RFC 5245 language to original requirements from RFC3605.

Thanks for pointing it out, Roman!

> Ah, I had missed that subtlety.  It sounds like this would be useful in a "changes from RFC 5245" section,
> except that per Alissa's position, we are probably not obsoleting RFC 5245 anymore in this document.
> But probably we can still have a similar section.

Such section ("Changes to RFC 5245") is created in the following pull request:

https://github.com/suhasHere/ice-sip-sdp/pull/12

The section will be added to the document no matter what the to-obsolete-or-not-to-obsolete outcome is.

...

Section 3.4.1.2.2

>>>>>   line associated with that data stream MUST match the data associated
>>>>>   with the nominated pair for that data stream.  In addition, the
>>>>>   offerer only includes SDP candidates representing the local
>>>>>   candidates of the nominated candidate pair.  The offerer MUST NOT
>>>>>   include any other SDP candidate attributes in the subsequent offer.
>>>>
>>>> Does this mean that exactly one a=candidate line must appear in
>>>> the corresponding m= section?
>>>
>>> Correct. Do you think that needs to be more clear?
>>>
>>
>> Correction, one candidate per component must appear in the
>> corresponding m= section. If RTCP is used, two candidates will be present.

Correct.

> The correction is appreciated :)

Regards,

Christer

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