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Re: [MMUSIC] Please Read and Comment: Re: ICE SDP/JSEP peace accords

Flemming Andreasen <fandreas@cisco.com> Fri, 25 January 2019 14:05 UTC

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To: Adam Roach <adam@nostrum.com>, Roman Shpount <roman@telurix.com>
Cc: Christer Holmberg <christer.holmberg@ericsson.com>, "mmusic@ietf.org" <mmusic@ietf.org>
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From: Flemming Andreasen <fandreas@cisco.com>
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Date: Fri, 25 Jan 2019 09:05:53 -0500
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Subject: Re: [MMUSIC] Please Read and Comment: Re: ICE SDP/JSEP peace accords
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On 1/22/19 4:42 PM, Adam Roach wrote:
> On 1/22/19 3:40 PM, Roman Shpount wrote:
>> On Tue, Jan 22, 2019 at 4:36 PM Adam Roach <adam@nostrum.com 
>> <mailto:adam@nostrum.com>> wrote:
>>
>>     On 1/22/19 3:33 PM, Roman Shpount wrote:
>>>     On Tue, Jan 22, 2019 at 4:25 PM Adam Roach <adam@nostrum.com
>>>     <mailto:adam@nostrum.com>> wrote:
>>>
>>>         On 1/22/19 3:15 PM, Roman Shpount wrote:
>>>         > The issue is the offer generated when ICE restart is not
>>>         initiated and
>>>         > TCP candidate is currently nominated. TCP candidate is the
>>>         only
>>>         > candidate which is present in both offer and answer. It is
>>>         also the
>>>         > default candidate. No UDP candidate will be added it any
>>>         point during
>>>         > the offer/answer exchange.
>>>
>>>
>>>         This is what I tried to indicate with the use of an
>>>         italicized "always"
>>>         in my previous reply.
>>>
>>>         EVEN IF it is generating an offer when ICE restart is
>>>         initiated and the
>>>         TCP candidate is nominated, Chrome will still always
>>>         (always, always)
>>>         generate an SDP that includes a UDP candidate and use that
>>>         candidate's
>>>         value in the m=/o= lines.
>>>
>>>     Unless I am mistaken, if ICE restart is not initiated, only the
>>>     nominated candidate must be included. No other candidates must
>>>     be present. If Chrome does not follow this, then it is most
>>>     likely not complaint with either ICE or JSEP specifications.
>>
>>
>>     Based on the conversation I had with their engineers, that seems
>>     to be the case.
>>
>>
>> Based on RFC 5245 section 9.1.2.2 
>> (https://tools.ietf.org/html/rfc5245#section-9.1.2.2) this is wrong:
>>
>>     The agent MUST include candidate attributes for candidates
>>     matching the default destination for each component of the media
>>     stream, and MUST NOT include any other candidates.
>>
>
> I'm not disagreeing.
>

So where does this leave us ?

Thanks

-- Flemming

> /a
>

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