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Re: [MMUSIC] draft-holmberg-mmusic-rfc8843bis

Christer Holmberg <christer.holmberg@ericsson.com> Fri, 02 April 2021 20:22 UTC

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From: Christer Holmberg <christer.holmberg@ericsson.com>
To: Roman Shpount <roman@telurix.com>
CC: Paul Kyzivat <pkyzivat@alum.mit.edu>, IETF MMUSIC WG <mmusic@ietf.org>
Thread-Topic: [MMUSIC] draft-holmberg-mmusic-rfc8843bis
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Date: Fri, 02 Apr 2021 20:22:26 +0000
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Subject: Re: [MMUSIC] draft-holmberg-mmusic-rfc8843bis
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Hi,

>I would suggest that we make the processing of  m= lines with port zero and a=bundle-only a SHOULD for all offers and answers. The reason for SHOULD is that you probably
>can skip this if you know that all endpoints which communicate with you implement the new specification, but there is no strong reason for your endpoint not to support this.
>Implementation wise, it should not be a big burden to implement support for port zero and a=bundle-only everywhere.

I don’t have a strong opinion – whatever makes the community happy.

>Do you know any endpoints that generate m= lines with a=bundle-only and do not support port zero in m= line in the answer? I am not aware of any.

I am not aware of such endpoint either.

>Finally, in section 7.3.4: "The answerer includes an SDP 'bundle-only' attribute in, and assigns a zero port value to, the video "m=" section." I think this is no longer accurate.

Correct. Good catch. I’ll fix that in the next version.

Regards,

Christer



On Fri, Apr 2, 2021 at 2:45 PM Christer Holmberg <christer.holmberg=40ericsson.com@dmarc.ietf.org<mailto:40ericsson.com@dmarc.ietf.org>> wrote:
Hi,

>Regarding the following in section 7.3:
>
>    ... In order to be backward compatible with
>    offerers that implement that version of the specification, an
>    answerer needs to accept such offers.
>
> This isn't normative. Is it intended that this is non-normative - to simply be advisory to that want to be backward compatible?

That's one thing (maybe the only thing) where we may need some discussion.

When I wrote the text, I was also thinking about a normative STRONGLY RECOMMENDED.

I don't know whether MUST or SHOULD would make much sense, as we know there are endpoints that don't implement it.

Regards,

Christer

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