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Re: [rtcweb] JSEP-03: O/A state machine and trickle ICE with forking

Christer Holmberg <christer.holmberg@ericsson.com> Fri, 01 March 2013 11:24 UTC

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From: Christer Holmberg <christer.holmberg@ericsson.com>
To: Harald Alvestrand <harald@alvestrand.no>, "rtcweb@ietf.org" <rtcweb@ietf.org>
Thread-Topic: [rtcweb] JSEP-03: O/A state machine and trickle ICE with forking
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Date: Fri, 01 Mar 2013 11:24:22 +0000
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Subject: Re: [rtcweb] JSEP-03: O/A state machine and trickle ICE with forking
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Hi Harald,

>My understanding is that the mismatch is that the JS APP isn't giving a consistent story to the browser on whether the answer was final or not.
>This sequence would work:
>
>BROWSER                         JS APP                                    REMOTE ENITTY
>
>    ------ create offer ----------
>                                             -------- SDP Offer 1----------------->
>                                            <------- SDP Answer 1 ----------------
>    ------ set remote pranswer(1) ---------
>                                            <------- SDP Offer 2 -------------------
>    ------ set remote answer(1) -----
>    ------ set remote offer(2) -----
>
>that is, when the JS app gets the information that there's a new offer incoming, it realizes that Answer 1 needs to be treated as a final answer, and finalizes it before passing in the new offer.

The problem with such approach is that it will terminate forking, i.e. it will not be possible to pass an SDP Answer from ANOTHER remote entity to the browser.

BROWSER                         JS APP                                    REMOTE ENTITY A         REMOTE ENTITY B

    ------ create offer ----------
                                             -------- SDP Offer 1----------------->
                                            ------- SDP Offer 1 ---------------------------------------------------->
                                            <------- SDP Answer 1 (A) -----------
    ------ set remote pranswer(1) ---------
                                            <------- SDP Offer 2 (A) --------------
    ------ set remote answer(1) -----
    ------ set remote offer(2) --------
                                            <------ SDP Answer 1 (B) ---------------------------------------------
    ------ ???? ----------------------------



Regards,

Christer

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