[Standards] XEP-0371: Jingle ICE Transport Method - Question on ICE Restart detection

Peter Saint-Andre stpeter at mozilla.com
Wed Nov 17 17:05:32 UTC 2021


On 11/17/21 2:25 AM, Philipp Hancke wrote:
> Am 16.11.21 um 20:31 schrieb Daniel Gultsch:
>> Hi,
>>
>> I’m trying to implement ICE Restarts with XEP-0371. The XEP states
>> that ICE restarts can be detected by a changed ufrag and pwd
>> attributes in the transport-info.
>>
>> However what I'm currently unclear about is how I can detect if the
>> incoming transport-info is a request to restart ICE on its own or a
>> response to an ICE restart we initiated.
>>
>> Or to put it into WebRTC terminology how do I know if a transport-info
>> with changed ufrag/pwd is an Offer or an Answer.
> 
> oh this does a fancy variant which doesn't map 1:1 to WebRTC sdp.
> 
> Assume the following collision happening in parallel:
> initiator: restart, transport-info
> responder: restart, transport-info
> Upon receiving the messages,
> - the initiator consider the second message a response and maps it to an 
> answer.
> - the responder will also consider it a response and map it to an answer.
> 
> Both will then update their respective ufrag/pwd and be happy.
> 
> It should actually work no matter what, leaving role conflict handling 
> to ICE. Oddly
>    https://jsfiddle.net/fippo/ytqmnsxh/5/
> never changes the pair in Firefox but i'll go nag someone.

I might know people. ;-)

> In general I would always initiate restarts from one side (e.g. the 
> intiator), not both. Why bother with glare and conflicts when it is 
> trivial to avoid...

+1

/psa



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