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

Christer Holmberg <christer.holmberg@ericsson.com> Wed, 23 January 2019 07:40 UTC

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From: Christer Holmberg <christer.holmberg@ericsson.com>
To: Adam Roach <adam@nostrum.com>, Roman Shpount <roman@telurix.com>
CC: Flemming Andreasen <fandreas@cisco.com>, "mmusic@ietf.org" <mmusic@ietf.org>
Thread-Topic: Please Read and Comment: Re: [MMUSIC] ICE SDP/JSEP peace accords
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Subject: Re: [MMUSIC] Please Read and Comment: Re: ICE SDP/JSEP peace accords
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Hi,

Assuming that the default candidate is UDP, but a TCP candidate is eventually nominated, since there is no update offer does that mean that the setup and connection attributes (and possible other TCP-specific attributes) will never be provided in an offer/answer from the JSEP endpoint? Wouldn’t that also break RFC4145?

Regards,

Christer


From: "adam@nostrum.com" <adam@nostrum.com>
Date: Tuesday, 22 January 2019 at 23.43
To: Roman Shpount <roman@telurix.com>
Cc: Christer Holmberg <christer.holmberg@ericsson.com>, Flemming Andreasen <fandreas@cisco.com>, "mmusic@ietf.org" <mmusic@ietf.org>
Subject: Re: Please Read and Comment: Re: [MMUSIC] ICE SDP/JSEP peace accords

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.

/a

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