Subject: [SIP] Problem with REFER

From: Sekhar Banerjee <[email-masked]>
Date: Fri, 22 Dec 2000 13:45:08 -0800

Hi All,
	I am having a hard time trying to figure out how to make the
Transferee send the Invite to the Transfer Target through the proxy when
REFER is used to transfer the call. Could any of you guys shed some light on
how this can be achieved.
	
	Transferee			Transferor
Proxy				Transfer Target

	Invite	----------------------------------->
			<---------------------------------- 100 Trying
						 <--------------- Invite
					 200   ---------------->
			<---------------------------------- 200
	Ack          ----------------------------------->
					       <---------------- Ack
					Invite(c=0)------------->
			<----------------------------------- Invite(c=0)
	200 Ok	------------------------------------>
						 <---------------- 200 Ok
					 Ack    ---------------->
			<----------------------------------- Ack
					Invite(TT)-------------->
	
Invite  ---------------------->
	
<--------------------- 200
						 <----------------- 200
					Ack	  ----------------->
	
Ack	   ----------------------->

					Bye	 ------------------>
	
Bye    ----------------------->
					Refer  ------------------>
			<------------------------------------ Refer
	
<---------------------- 200 Ok
						<------------------ 200 OK
		
	Invite
---------------------------------------------------------------------->
	
<-------------------------------------------------------------------- 200 Ok
	Ack
---------------------------------------------------------------------->

	Bye
---------------------------------------------------------------------->
	
<--------------------------------------------------------------------- 200
OK

	I would like to see the last Invite and Bye go through the proxy too
so that the proxy can control that call. Would a Record-Route in the Refer
help me achieve this goal ? I cant seem to find anything in the spec to
figure this one out. I would appreciate any help on this one.

Thanks

Sekhar		

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