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

Christer Holmberg <christer.holmberg@ericsson.com> Tue, 22 January 2019 20:36 UTC

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From: Christer Holmberg <christer.holmberg@ericsson.com>
To: Flemming Andreasen <fandreas@cisco.com>, Adam Roach <adam@nostrum.com>, Roman Shpount <roman@telurix.com>, "mmusic@ietf.org" <mmusic@ietf.org>
Thread-Topic: Please Read and Comment: Re: [MMUSIC] ICE SDP/JSEP peace accords
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Date: Tue, 22 Jan 2019 20:36:05 +0000
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Subject: Re: [MMUSIC] Please Read and Comment: Re: ICE SDP/JSEP peace accords
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Hi,


I think Roman requested information about what exactly has been implemented.


Regards,


Christer






________________________________
From: Flemming Andreasen <fandreas@cisco.com>
Sent: Tuesday, January 22, 2019 10:17 PM
To: Christer Holmberg; Adam Roach; Roman Shpount; mmusic@ietf.org
Subject: Please Read and Comment: Re: [MMUSIC] ICE SDP/JSEP peace accords

MMUSIC folks

It would be helpful if more people would chime in on this thread so we can gauge how to proceed.

Thanks

-- Flemming (with co-chair hat on)

On 1/15/19 4:24 AM, Christer Holmberg wrote:

Hi,



1. We are discussing the JSEP update that changes the protocol behavior. Subsequent offers in JSEP always specified transport,
address and port of the only (default) candidate present. No version of JSEP draft was ever published where it was not the case.
This is a protocol change which is being done when document is already in Editor Queue. If any implementations currently exist
that send UDP/TLS/RTP/SAVPF in subsequent offers when only TCP candidates are present, they are not compliant with latest published JSEP draft.


The JSEP document was internally inconsistent, as you have pointed out in the past. Two statements conflicted with each other, so no matter
what an implementation did, it was possible to point to a normative statement in JSEP that it was violating. The change to JSEP is being made
to bring it in line with the behavior that was actually developed and deployed.


If the JSEP contains two conflicting statements, and we have to choose one, it sounds strange that we would choose the one that is inconsistent with the ICE spec.

Also, as I have indicated before, JSEP defines an internal API - not a signaling protocol. I DO understand that it is convenient to use the same "JSEP SDP O/A & ICE procedures" alsao on the wire, but AFAIK that is not defined anywhere. What SDP O/A & ICE procedures is a WebRTC endpoint that do NOT implement JSEP expected to use?

Regards,

Christer

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