Thanks & Regards,
Nataraju A.B.
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Madhuri
Sakhare
Sent: Thursday, May 25, 2006 7:40 PM
To: [email protected]
Subject: [Sip-implementors] Query Regarding Collision case of CANCEL.
Hi,
Consider this call flow:
UAC UAS
| INVITE |
|----------------------->|
| 180 RINGING |
|<-----------------------|
| CANCEL |
|----------------------->|
| 200 OK CANCEL |
|<-----------------------|
| |
This is a collision case of a reliable 180 response and a CANCEL
Request. The application on the callee side has sent a 200 OK response,
and the response is left pending in the SIP stack. Then the collision
occurs and the CANCEL is indicated to the application, but since it has
already sent a final response, it has no way of sending another one. The
call is not freed.
How should the SIP stack responds to this?
[ABN] This scenario has been discussed in the list quite a few times...
if the callee UA had already sent 200OK for INVITE then 200OK will not
be sent for CANCEL. CANCEL would be rejected with 481 responses...
The call will go through...
The caller's SIP stack has to initiate the BYE request to terminate the
call once the INV/200/ACK transaction is completed... if the user had
hung up the call...
Regards,
Madhuri
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