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

Flemming Andreasen <fandreas@cisco.com> Mon, 13 May 2019 16:26 UTC

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To: Suhas Nandakumar <suhasietf@gmail.com>
Cc: mmusic WG <mmusic@ietf.org>, Christer Holmberg <christer.holmberg@ericsson.com>
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From: Flemming Andreasen <fandreas@cisco.com>
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Date: Mon, 13 May 2019 12:26:22 -0400
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Subject: Re: [MMUSIC] Is ice-mismatch media or session level?
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On 5/13/19 1:22 AM, Suhas Nandakumar wrote:
> I am inclined to leave it as media-level attribute. I am not sure what 
> more clarification is needed in the text today ?
Are the clarifications Roman suggested below already included ?

Thanks

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