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Re: [MMUSIC] ICE-SIP-SDP: Concluding ICE statement

Christer Holmberg <christer.holmberg@ericsson.com> Tue, 23 July 2019 21:29 UTC

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From: Christer Holmberg <christer.holmberg@ericsson.com>
To: Roman Shpount <roman@telurix.com>
CC: "mmusic@ietf.org" <mmusic@ietf.org>, "mmusic-chairs@ietf.org" <mmusic-chairs@ietf.org>
Thread-Topic: [MMUSIC] ICE-SIP-SDP: Concluding ICE statement
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Date: Tue, 23 Jul 2019 21:29:02 +0000
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Subject: Re: [MMUSIC] ICE-SIP-SDP: Concluding ICE statement
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Hi,

>> Again, the text says:
>> 
>>  “Once the state of each check list is Completed, and if the agent is
>>   the controlling agent, it nominates a candidate pair [RFC8445] and
>>   checks for each data stream whether the nominated pair matches the
>>   default candidate pair.”
>>
>> The text indicates that the agent nominates a candidate pairs once a check list is Completed. That is wrong. 
>> A check list becomes Completed *after* a candidate pair has been successfully nominated. Do you agree with that?
>
> I would agree that this text can be better. In general, in English two verbs in present tense in a sentence do not establish the temporal 
> relationship between the actions. Better text would say something like:
>
> Once the state of each check list is Completed, and if the agent is the controlling agent, it should have nominated a 
> candidate pair [RFC8445] and checks for each data stream whether the nominated pair matches the default candidate pair.
>
> There are still a few issues with this:
>
> 1. If aggressive nomination is used, multiple candidate pairs can be nominated for the same component of a 
> given data stream. Considering that aggressive nomination is deprecated, nothing implementing ice-sip-sdp 
> should be doing this and only one candidate pair (per component per data stream) should be nominated. I do not 
> think this is a problem.

Agree.

> 2. This language does not take into account that state for some check lists can be Failed. It is unclear if new offer should 
> always be generated in this case or only generated if ice2 options is not set. I am not sure what is the use case for partial 
> ICE failure. I have never dealt with this in practice. If you feel this needs to be fixed, please propose the language.

"Once the agent has successfully nominated a pair, the state of the check list associated with the pair is set to Completed.
Once the state of each check list is set to either Completed or Failed, for each Completed check list the
agent checks whether the nominated pair matches the default candidate pair. If there are one or more pairs that don't match,..."

Regards,

Christer

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