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

Christer Holmberg <christer.holmberg@ericsson.com> Tue, 23 July 2019 05:48 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 05:48:50 +0000
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Subject: Re: [MMUSIC] ICE-SIP-SDP: Concluding ICE statement
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>
Hi,

…

>Once check list is in Completed state (https://tools.ietf.org/html/rfc8445#section-8.1.1) only one pair should be in
>nominated state. This candidate pair becomes the selected pair for that agent and is used for sending and receiving
>data for that component of the data stream. In cases of aggressive nomination, agents selects the nominated pair with
>the highest priority. If this selected pair does not match the default candidate pair, and "ice2" option was not specified,
>then controlling agent MUST send a new offer with default candidate set to the local candidate in the selected pair for
>the default component, single candidate per component set to the local candidate of the selected pair, and single
>remote-candidate per component set to the remote candidate in the selected pair. Answer will contain the same.
>In other words, the new offer is sent, when only one pair per data stream component is left, nomination process was
>already completed, and single candidate pair per data stream per component is going to be used until the next ICE restart
>This is, essentially, a default candidate "true up".

Correct. I don’t think my comment contradicts the text above.

But, let’s take a step back. There is another issue with the text in draft-ice-sip-sdp, so maybe my issue becomes more clear once that has been addressed.

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?

Regards,

Christer

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