Hi,

Please refer  my call scenario


1) User A   created a Dialog with User B.   [ Call ID: AB, To tag: b1, from 
tag: a1]

2) User A  created another Dialog User C   [ Call ID: AC, To tag: c1, from tag: 
a2]

3) Now User A want to do conference call call with B & C

4) User A then creates a Dialog with a new Conference Server ( which I will  
refer as D )

5) User A then sends REFER request to D  to to make a call with B. [ here in 
Refer-To header the replaces parameter contain the details mentioned in Step 1.

6) User D successfully created a dialog with User B with Step 5 details.

7) The call mentioned in Step 1 is not disconnected till now. Means No BYE is 
sent from neither User A nor User B. So whether the call mentioned in Step 1 
will be terminated automatically? If yes then why?

8) Then   User A then sends  another REFER request to D  to to make a call with 
C. [ here in Refer-To header the replaces parameter contain the details 
mentioned in Step 2].

9) User D successfully created a dialog with User C with Step 8 details.

10) Now conference call is working successfully between  A, B & C using the 
conference server.

11) Now User A wants to terminate the B from that conference. So it sends a 
REFER request to D to send BYE request to User B. But in    Refer-To header 
does not have any Replace parameter or from tag, to tag details


Refer-To: sip:use...@abc.com;method=BYE.  


So whether D will able to send BYE to User B ? If yes, Then How can D will 
understand for which Dialog the BYE request need to be send since there is no 
details of the Dialog is mentioned in Refer-To header?

Thanks

Sourav Dhar Chaudhuri
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