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

Adam Roach <adam@nostrum.com> Tue, 22 January 2019 21:36 UTC

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To: Roman Shpount <roman@telurix.com>
Cc: Christer Holmberg <christer.holmberg@ericsson.com>, Flemming Andreasen <fandreas@cisco.com>, "mmusic@ietf.org" <mmusic@ietf.org>
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From: Adam Roach <adam@nostrum.com>
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Date: Tue, 22 Jan 2019 15:36:31 -0600
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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 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.

/a

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