Hello Anca,
I have read the b2bua tutorial and have opensips 1.62 installed.
I am mainly interested in the REFER scenario..
Would the current implementation of the b2bua support the following scenario ?
UE-A calls UE-C and are in a call. UE-C puts UE-A on hold.
UE-C call UE-B and are in a call. UE-C puts UE-B on hold.
OpenSIPs is not in the path of the original calls.
Before UE-C bridges UE-A and UE-B, UE-C wishes to get out the middle of the
call.
One way would be to send a REFER to UE-B .
What if the switch UE-B is connected to does not support REFER ? So I want to
do
the following..
UE-C sends a REFER to SIP-AS ( OPENSIPS ) and upon receipt of the REFER,
using the B2BUA , the SIP-AS would send an INVITE w/replaces and no SDP to UE-B
Upon receiving the 200 Ok w/SDP. the SIP-AS would send an INVITE to UE-A with
the
SDP received from UE-B's 200 Ok. Upon receiving an ACK from UE-A , SIP-AS would
send an ACK back to UE-B and an INFO message to UE-C and appropriate BYEs.
Below is a simple flow chart...
UE-C REFER------------------> OPENSIPS B2BUA(SIP_AS)
UE-B
INVITE w/replaces no
SDP---------------------->
<------------------------------------------200 OK w/SDP(1)
INVITE w/ SDP (1) UE-A
--------------------------------->
<----------------200 OK w/SDP
ACK--------------------------------------------------->
ACK--------------------------->
<-------------------------NOTIFY
thanks in advance for your help,
--Jignesh
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