Thanks Paul.... Go the idea, apologies for making it bit complicated, BR, Manoj
-----Original Message----- From: Paul Kyzivat [mailto:pkyzi...@cisco.com] Sent: Wednesday, July 01, 2009 9:04 PM To: Manoj Priyankara [TG] Cc: sip-implementors@lists.cs.columbia.edu Subject: Re: [Sip-implementors] Call Transfer through a SIP trunk Manoj Priyankara [TG] wrote: > 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 OK. Looking at it again, the flows you describe aren't consistent with the transfer you seem to be talking about. If C called A, and then A wants to transfer the call to B, then the goal is to have C talking to B, right? That's not what you showed. And the simple answer is that you only have two choices: - send a REFER to C, or B, to directly connect them. But I think you state the SS refuses this. (Depending on signaling, you *might* be able to bypass SS. But I doubt it.) - you must insert something, which will have to be a B2BUA, to bridge the B call leg to the C call leg. It could be A, but the PBX is a more likely candidate. But you might not have to relay the media. With some care and some luck, you might be able to offer B's sdp to C and C's to B. Then you would be in the signaling path, but not the media path. That would make it a fairly small cost. Paul > 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 >> https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors >> > _______________________________________________ > Sip-implementors mailing list > Sip-implementors@lists.cs.columbia.edu > https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors > _______________________________________________ Sip-implementors mailing list Sip-implementors@lists.cs.columbia.edu https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
