Re: [MMUSIC] Is ice-mismatch media or session level?

Roman Shpount <roman@telurix.com> Mon, 29 April 2019 20:44 UTC

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From: Roman Shpount <roman@telurix.com>
Date: Mon, 29 Apr 2019 16:44:43 -0400
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To: Christer Holmberg <christer.holmberg@ericsson.com>
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Subject: Re: [MMUSIC] Is ice-mismatch media or session level?
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Hi Christer,

Thank you for reviewing and responding.

On Sat, Apr 27, 2019 at 1:48 PM Christer Holmberg <
christer.holmberg@ericsson.com>; wrote:

> Before we just change something back we need to think what the reason for
> the change to media-level was. Could it be related to RTCWEB?
>
>
This is definitely not RTCWEB related, since RTCWEB should never generate
ice-mismatch or use it for any reason.

The ice-mismatch attribute was session only according to RFC 5245 Section
21.1.4 (https://tools.ietf.org/html/rfc5245#section-21.1.4). At the same
time, according to RFC 5245 Section 15.3 (
https://tools.ietf.org/html/rfc5245#section-15.3), ice-mismatch is media
level attribute only. This being said, according to RFC 5245 Section 6.1 (
https://tools.ietf.org/html/rfc5245#section-6.1), ice-mismatch applies to
the whole session, but it is specified per m= line. According to errata
3149 (https://www.rfc-editor.org/errata/eid3149), ice-mismatch should be
media level. So, it is a bit of a mess.

I can change ice-mismatch back to media level, but what we need to clarify
then is the following: If ice-mismatch is present in the m= line, does it
stop ICE processing for the whole session or for this m= line only?

If it stops ICE processing for the whole session then it makes little or no
sense being specified per m= line. If it only stops processing for specific
m= line, then ice-mismatch probably also makes sense at the session level
to stop ICE processing for the whole session.

I am definitely open to input here.
_____________
Roman Shpount