[SIPForum-discussion] Simultenous UPDATE Handling

[raj kumaradass]

Greetings,

Would like to know how the below scenario be handled, where both the ends of
a call send UPDATE msg(inorder to switch from established audio call to
video) simultaneously and the timing is more of alike a UPDATE response
received for a UPDATE req sent on both the entities.


UE-A
                                               UE-B

      ---------------------INVITE(SDPoff - audio codecs) ------------>

      <--------------------180(Ringing)
---------------------------------------

      <---------------------200 OK(SDPans - audio codecs) ---------

      ---------------------UPDATE(SDPoff - Video codec) ---------->

      <--------------------UPDATE(SDPoff - Video codec) ------------


Also please suggest if any standards/links which details out on handling
similiar scenarios.


thankS,
...Raj
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