comments inline...

Regards,
Nataraju A.B.
Kodiak Networks...

-----Original Message-----
From: [EMAIL PROTECTED] on behalf of Bu, Wen Fei (Leo)
Sent: Wed 5/24/2006 1:30 AM
To: [email protected]
Subject: [Sip-implementors] How could a caller's UA send a BYE for earlydialogs?
 
Per RFC 3261, 15 Termination a Session: 
  The caller's UA MAY send a BYE for either confirmed or 
  early dialogs, and the callee's UA MAY send a BYE on 
  confirmed dialogs, but MUST NOT send a BYE on early dialogs. 

How could a caller's UA send a BYE for early dialogs? 
The caller's dialog is transmitted to confirmed state only 
after receiving a 2xx for INVITE. If the caller's UA wants 
to terminate the session before the final response, a CANCEL 
should be sent out instead of a BYE.

Then in which case will the caller's UA send a BYE for early 
dialogs?

[ABN] this issue is been discussed earlier. 
I guess BYE would be sent on an early dialog to terminate that particular call 
leg while still retaining the other dialogs establised as part of the 
particular session. 

Note: CANCEL would terminate the complete session. 

Thanks,

Leo, Bu

Plexus Signaling
Lucent Technologies Qingdao R&D
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