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

Flemming Andreasen <fandreas@cisco.com> Mon, 13 May 2019 03:40 UTC

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To: Roman Shpount <roman@telurix.com>, Christer Holmberg <christer.holmberg@ericsson.com>
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From: Flemming Andreasen <fandreas@cisco.com>
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Date: Sun, 12 May 2019 20:27:36 -0400
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Subject: Re: [MMUSIC] Is ice-mismatch media or session level?
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Based on the errata, it seems like the intent was for to be media-level. 
I'd suggest we keep it that way and add the clarifications you outline 
below.

If people feel otherwise, please speak up no later than May 19.

Thanks

-- Flemming (with chair hat on)



On 4/29/19 4:44 PM, Roman Shpount wrote:
> Hi Christer,
>
> Thank you for reviewing and responding.
>
> On Sat, Apr 27, 2019 at 1:48 PM Christer Holmberg 
> <christer.holmberg@ericsson.com 
> <mailto: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
>
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