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hi,
I have one doubt in CANCEL/BYE operation. The
scenario is as follows :-
A
B
| | | INVITE | |-------------->| | 180 Ringing | |<--------------| | | User A invites user B. Now B responds with 180
Ringing with to tag and hence establishes early dialog. Now user A has decides
that he does not want to continue the call. Hence he decides to
terminate the dialog. Now according to my opinion, there are two
possible ways to do so :-
1. A sends CANCEL to B. Then if B responds
with 2xx response to INVITE, then A terminates the dialog by sending
BYE. Else if B responds with non-2xx code, then dialog will be
terminated and user A need to do any thing more other than
sending ACK.
2. A sends BYE to B (BYE can be sent as early
dialog is already established). B checks if he has sent final response to
INVITE. If so he just reponds with 200 OK for BYE. Else if B has
not yet sent final response for INVITE, then B sends a
non-2xx error code for INVITE as soon as it sees BYE and then
responds with 200 for BYE.
I feel that option 2 is better to terminate dialog
as it requires 2 messages less than the option 1.
What is the procedure normally followed in the
above scenario :- Option 1 or Option 2 ?
Rgds
Krishna
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