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Re: [MMUSIC] ICE SDP/JSEP peace accords

Christer Holmberg <christer.holmberg@ericsson.com> Tue, 15 January 2019 09:25 UTC

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From: Christer Holmberg <christer.holmberg@ericsson.com>
To: Adam Roach <adam@nostrum.com>, Roman Shpount <roman@telurix.com>
CC: "mmusic@ietf.org" <mmusic@ietf.org>
Thread-Topic: [MMUSIC] ICE SDP/JSEP peace accords
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Date: Tue, 15 Jan 2019 09:24:59 +0000
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Subject: Re: [MMUSIC] ICE SDP/JSEP peace accords
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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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