I have two transaction questions:
1. Consider the following scenario:
Caller--------------------------------------------------Callee
INVITE---------------------------------------------------->
<-------------------------------------------------------100 Trying
+--------------------------200 OK
|
CANCEL-----------------------|--------------------------->
|
<----------------------------|--------------------------481(To CANCEL)
|
<----------------------------+
ACK(to 200)---------------------------------------------->
Here, the 200 response is delayed until the CANCEL's 481 response is received.
Firstly, is this call flow correct? Secondly, What should the callee do on receipt of
the ACK? Should it drop or accept the ACK? Why?
2. I don't know why the "Proceeding" state on the figure of INVITE client transaction
doesn't contain a timer. If the client's network is disconnected in this state, it
seems the client will remain in "Proceeding" forever.
nicky
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