Ford Cheng wrote:
> I have one question on timer to consult, for
> example, UA A send INVITE request to UA B,
> without receiving final response, UA A want to
> cancel this request, it will send CANCEL and BYE
> request. Then I think at this time, if CANCEL and
> BYE send out. Then the timer for retransmit INVITE
> will be cancelled, thus it can shorten the flow in
> the network.
No, the retransmission of the INVITE should not be
affected by a CANCEL or a BYE or any other request.
The motivation it that any one transaction is
completely independent of any other transaction.
This makes the protocol nice and clean, and helps
to simplify state machines.
HTH,
- Jo.
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