Re: [MMUSIC] ICE tiebreaker - session-level or media-level?

[Marc Petit-Huguenin <[e-mail]>]

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On 10/11/2012 11:25 PM, Justin Uberti wrote:
> Reviewing the handling of role conflicts, a question came up: in the event 
> different systems handle different media in a session, do they have to
> share the same ICE tiebreaker?
> 
> Section 5.2 of RFC 5245 indicates that the ICE Agent chooses the
> tiebreaker, indicating that this is a session-level value.
> 
> To resolve this, each agent MUST select a random number, called the
> tie-breaker, uniformly distributed between 0 and (2**64) - 1 (that is, a
> 64-bit positive integer).  This number is used in connectivity checks to
> detect and repair this case, as described in Section 7.1.2.2
> <http://tools.ietf.org/html/rfc5245#section-7.1.2.2>.
> 
> 
> Or am I misreading, and each m= line corresponds to its own ICE Agent, with
> its own tiebreaker value?
> 

Well, it is obvious that ICE was not designed with an Agent per m= line, see
draft-petithuguenin-mmusic-ice-attributes-level.  Work on rfc5245bis will
start after the Atlanta meeting, so this will be a good time to fix this.
Meanwhile, is there any interoperability problem when implementing an ICE
Agent per m= line?

- -- 
Marc Petit-Huguenin
Email: [e-mail]
Blog: http://blog.marc.petit-huguenin.org
Profile: http://www.linkedin.com/in/petithug
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