It is certainly legal to continue retransmitting the CANCEL even though
it will have no effect. A more interesting question is whether it is
legal to suppress retransmissions in this case. From a practical
perspective I see no problem with doing that if you wish.
Paul
[EMAIL PROTECTED] wrote:
> From: praveen dandin <[EMAIL PROTECTED]>
>
> Is it valid for UAC to retransmit CANCEL request even after getting
> 200 OK for INVITE (until UAC receives 200 OK for CANCEL or CANCEL
> transaction times out)?
>
> Yes, of course. It just has no effect. Among other reasons, the UAS
> has to be prepared to receive the CANCEL after sending a 200 for the
> INVITE because the 200 might have been lost.
>
> Dale
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