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

Suhas Nandakumar <suhasietf@gmail.com> Wed, 15 May 2019 07:59 UTC

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From: Suhas Nandakumar <suhasietf@gmail.com>
Date: Wed, 15 May 2019 00:59:23 -0700
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To: Flemming Andreasen <fandreas@cisco.com>
Cc: 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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On Mon, May 13, 2019 at 9:26 AM Flemming Andreasen <fandreas@cisco.com>;
wrote:

>
>
> 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 ?
>


I am finding it hard to parse suggested clarification. I am sure I am
missing something.


> Thanks
>
> -- Flemming
>
>
> 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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