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

Roman Shpount <roman@telurix.com> Tue, 22 January 2019 21:33 UTC

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References: <0454609c-ce69-80d4-93d8-f89bc8ba897e@nostrum.com> <CAD5OKxu1bPDU_snQ=H7RwVgPKW_hKJY1Nj7g82vTpJ+gorPrYQ@mail.gmail.com> <f279e997-0236-b78c-e555-5189d9818ef2@nostrum.com> <9B6124BE-E369-4327-B759-77DB0ED8A484@ericsson.com> <6f42b5c5-72f0-8d6a-c68d-d19da7d94353@cisco.com> <HE1PR07MB3161189A6405D403F433F17293980@HE1PR07MB3161.eurprd07.prod.outlook.com> <CAD5OKxvNYnARbw5yvSHCeQUiSMRxQdMj9h5zUeXj+o3Nd8Kh-g@mail.gmail.com> <3e17ec5d-e6b2-5d38-e206-2ed7b8b9c690@nostrum.com> <CAD5OKxtzxOfE9O-G5tQ1C_sg8LHQBxpNATJi_ee-UVcp0gdb2w@mail.gmail.com> <ab0940dd-9ad0-d012-5530-a6a35dd659e9@nostrum.com>
In-Reply-To: <ab0940dd-9ad0-d012-5530-a6a35dd659e9@nostrum.com>
From: Roman Shpount <roman@telurix.com>
Date: Tue, 22 Jan 2019 16:33:45 -0500
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To: Adam Roach <adam@nostrum.com>
Cc: Christer Holmberg <christer.holmberg@ericsson.com>, Flemming Andreasen <fandreas@cisco.com>, "mmusic@ietf.org" <mmusic@ietf.org>
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Subject: Re: [MMUSIC] Please Read and Comment: Re: ICE SDP/JSEP peace accords
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On Tue, Jan 22, 2019 at 4:25 PM Adam Roach <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.

Regards,
_____________
Roman Shpount

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