responses inline... Tanmay Zargar wrote: > > Hello all, > I have some doubts regarding a SIP B2BUA. > > The B2BUA is defined as a virtual UAS/UAC connected back to back. > It differs from a SIP proxy in that it can originate requests apart > from ACK and CANCEL. Also, the B2BUA is supposed to provide the > interface to call-control/service logic - eg. to an external > media/application server. > > I want to know if the SIP B2BUA can itself be an end point like a > normal UA?
Yes, it is an endpoint on two call legs, UAS on one and a UAC on the other. > Is the functionality of the B2BUA the same as that of the normal UA? > Does it have to be call/dialog stateful? Yes, it follows the rules defined for a UAS on one call leg and follows the rules for a UAC on the other call leg. > Is there any document/draft that specifies the behaviour of a SIP > B2BUA - particularly its interface with the application > server and how > it can be used as a 3PCC service execution controller? The sip-3pcc draft below is a good one. But these drafts don't define the "B2BUA" specifically. It's just a UAS-UAC, which is defined in the base SIP specification. The peer-3pcc draft takes a little different approach, showing how a UA itself can do interesting things vs. a "controller platform" handling many calls at a time. > > I have gone through a few drafts (listed below) on 3PCC but > there is no > information on the architecture/functionality/interface of the B2BUA > with the application server. > > http://www.cs.ru.ac.za/research/g9610645/sip/draft-ietf-sip-service- > examples-01.txt > http://www.ietf.org/internet-drafts/draft-mahy-sip-cc-models-01.txt > http://www.cs.columbia.edu/sip/drafts/draft-mahy-sip-peer-3pcc-00.txt > http://www.globecom.net/ietf/draft/draft-culpepper-sip-key-events- > 00.html#6 > http://iptel.org/info/players/ietf/callprocessing/draft-rosenberg-sip- > 3pcc-03.txt > > I would appreciate if anyone could provide me with any > answers/clarifications/leads to the above. The point is, some services in the PSTN for example can be supported in SIP networks using some clever application of SIP UAC/UAS behavior. B2BUAs are just one approach though, depending on the service there may be better approaches. Regards, Bert > Thanks, > Tanmay. > > _______________________________________________ Sip-implementors mailing list [EMAIL PROTECTED] http://lists.cs.columbia.edu/mailman/listinfo/sip-implementors
