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? Is the functionality of the B2BUA the same as that of the normal UA? Does it have to be call/dialog stateful? 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? 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. Thanks, Tanmay.
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