[OpenSIPS-Users] re : Question about B2BUA modules..

[jignesh gandhi]

Hello Anca,


Thanks for your quick reply.
Just wanted to make sure that I understand what you are saying.

Are you saying that B2BUA needs to be in the middle of the UE-A to UE-C and
UE-C to UE-B calls ?

I am not planning on sending a Re-Invite to UE-B, but a new INVITE w/replaces.

thanks,
--Jignesh
======================

Message: 2
Date: Fri, 09 Jul 2010 11:15:16 +0300
From: Anca Vamanu <anca at opensips.org>
Subject: Re: [OpenSIPS-Users] re : Question about B2BUA modules..
To: users at lists.opensips.org
Message-ID: <4C36DA94.5000607 at opensips.org>
Content-Type: text/plain; charset="iso-8859-1"

Hi Jignesh,

This scenario will work with the B2BUA component if you use the refer 
scenario, but you have to put the B2BUA in the middle of the call from 
the beginning (the call where the REFER is received, in your example 
from UE-C to UE-B), it is not possible othervise for it to send a 
reInvite in that dialog if it is not controlling it. The only thing that 
you won't see is the Notify at the end sent to UC-E, now B2BUA does not 
send this.

Regards,

-- 
Anca Vamanu
www.voice-system.ro




On 07/08/2010 11:30 PM, jignesh gandhi wrote:
> 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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