Simply put,anything that cannot do by the regular SIP entities like UAC/UAS, proxy, CSCFs can be done by a B2BUA.
Regards Ranjit -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of M. Ranganathan Sent: Thursday, September 25, 2008 9:57 PM To: Iñaki Baz Castillo Cc: sip-implementors@lists.cs.columbia.edu Subject: Re: [Sip-implementors] why do we need b2bua? On Tue, Sep 23, 2008 at 2:23 PM, Iñaki Baz Castillo <[EMAIL PROTECTED]> wrote: > El Martes, 23 de Septiembre de 2008, Paul Kyzivat escribió: >> Iñaki, >> >> While many "pbx"s (including those from my employer) are implemented >> as B2BUAs, it is possible to implement pbx functionality without a B2BUA. >> (Dale and Scott can explain to you how they do it.) > > Sure, I don't doubt it at all. But the example I told ("redirecting > the call to other destination when the leg B ends") is just possible > with a B2BUA, and under my understanding that is a really commonly > requested feature in any PBX. > > Also, if you want the PBX to ends a call after X seconds it must be a > B2BUA (a proxy cannot generate in-dialog messages). Am I wrong? > > Thanks for your comment. > > -- > Iñaki Baz Castillo Here is a good use case: When you want to hide transfers from ITSPs (many do not like REFER) you need to use a b2bua to keep the signaling local to the pbx that generates the REFER. You can convert the REFER transfer to a Re-INVITE on the ITSP side. You cannot do this without a B2BUA. Checkout the sipxbridge project on sipfoundry. > > _______________________________________________ > Sip-implementors mailing list > Sip-implementors@lists.cs.columbia.edu > https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors -- M. Ranganathan _______________________________________________ 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
