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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