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

Suhas Nandakumar <suhasietf@gmail.com> Mon, 13 May 2019 05:23 UTC

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From: Suhas Nandakumar <suhasietf@gmail.com>
Date: Sun, 12 May 2019 22:22:59 -0700
Message-ID: <CAMRcRGSyWB3O04CDOUx1oXtyL=AyB--dM-e+ABfm2dN16RK7sw@mail.gmail.com>
To: Flemming Andreasen <fandreas@cisco.com>
Cc: Roman Shpount <roman@telurix.com>, Christer Holmberg <christer.holmberg@ericsson.com>, mmusic WG <mmusic@ietf.org>
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Subject: Re: [MMUSIC] Is ice-mismatch media or session level?
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I am inclined to leave it as media-level attribute. I am not sure what more
clarification is needed in the text today ?

On Sun, May 12, 2019 at 8:41 PM Flemming Andreasen <fandreas@cisco.com>;
wrote:

> 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>; 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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