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

[Justin Uberti <[e-mail]>]

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?


Thanks,

--justin