Hi,
I just start to dig into SIP. When I read RFC 2543, couldn't find anywhere
mention about retransmission SIP response, mainly 4xx, 5xx and 6xx.
The following is one of the case I confused:
If something goes wrong before final 200 response received, CANCEL
will be sent to the UAS.
UAC UAS
| |
| |
---------CANCEL-------------->
| |
|<--------200 -------------------|
| |
|<--------487 call cancelled|
| |
|----------ACK ---------------->|
1) Do we need retransmission 487?
2) Is there timers after send out 487 to wait ACK?
3) Is it possible 487 is received before 200?
Thanks in advanced,
Helen Luo
972-461-6330
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