Thanks Vipul,

In this case the UACs are defined in the IP-PBX and registered in the
IP-PBX.

When a UAC of the IP-PBX sends REFER message to transfer a call to the
SS through the SIP trunk SS sends 403 Forbidden to the REFER message.

Of course the SS can act as a B2BUA, but is it possible connect the call
legs from the SS and release the IP-PBX from the picture?

Thanks for the expert support
BR,
Manoj 


-----Original Message-----
From: Rastogi, Vipul (Vipul) [mailto:vrast...@avaya.com] 
Sent: Wednesday, July 01, 2009 2:45 PM
To: Manoj Priyankara [TG]; Paul Kyzivat
Cc: sip-implementors@lists.cs.columbia.edu
Subject: RE: [Sip-implementors] Call Transfer through a SIP trunk


If SS is acting as proxy then it can't handle media part. I would expect
SS also to be b2bua, in which case IP-PBX should exit from media path.
But as Paul said nothing is defined.

-----Original Message-----
From: sip-implementors-boun...@lists.cs.columbia.edu
[mailto:sip-implementors-boun...@lists.cs.columbia.edu] On Behalf Of
Manoj Priyankara [TG]
Sent: Wednesday, July 01, 2009 8:40 AM
To: Paul Kyzivat
Cc: sip-implementors@lists.cs.columbia.edu
Subject: Re: [Sip-implementors] Call Transfer through a SIP trunk

Hi Paul,

Sorry for using more generic terms. In this case the IP-PBX acts as a
B2BUA and the SS acts as a Proxy

BR,
Manoj

-----Original Message-----
From: sip-implementors-boun...@lists.cs.columbia.edu
[mailto:sip-implementors-boun...@lists.cs.columbia.edu] On Behalf Of
Paul Kyzivat
Sent: Tuesday, June 30, 2009 6:50 PM
To: Manoj Priyankara [TG]
Cc: sip-implementors@lists.cs.columbia.edu
Subject: Re: [Sip-implementors] Call Transfer through a SIP trunk

Manoj,

Virtually none of the terms you use below have well defined meanings in
sip standards. Many people use such terms, but AFAIK there are not well
understood and consistent implementations for them. So it is not
possible to answer your question as posed.

Tell us whether your SS and IP-PBX are proxies, or B2BUAs. And if
B2BUAs, do they terminate media or not.

Then it may be possible to give you an answer.

        Thanks,
        Paul

Manoj Priyankara [TG] wrote:
> Dear all,
> 
> Please consider the following scenario.
> 
> Assume that there is a standard Soft Switch; and an IP PBX is
connected
> to the SS using a SIP trunk. 
> 
> IP PBX has a user (Say A)
> 
> An incoming call comes from an external party through the SS to user
A.
> User A transfers that call to an external party. (Say B). This call
leg
> also goes through the SS
> 
> 
> Incoming call to A
> 
>               SIP Trunk
> C-----> |SS|-------->|IP-PBX|------> A
> 
> 
> Transfer to B
> 
> A---->|IP PBX|------->|SS|-------> B
> 
> In this scenario, can the media be bridged from the SS and release all

> the resources in the IP PBX once the call is transferred?
> 
> Thanks
> BR,
> Manoj
> 
> _______________________________________________
> Sip-implementors mailing list
> Sip-implementors@lists.cs.columbia.edu
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