Thanks for sharing this information.
I prefer the more generalized working definition of a b2bua as being UA-UA.
I agree that probably does not agree 100% with the literal definition, but it is
much more useful and an encompassing one. And I don't think it breaks
the definition either. The definition as in Section 6 of rf3261 was probably
not meant to be exclusive.
Thanks,
Ganesh
Joegen E. Baclor wrote:
B2BUA means Back to Back User Agent. Its scope is not intentionally defined for the sole purpose of flexibily of implemetation. I'll give you a perfect example of a UAC-UAC in real life.One of our product is an SMS CallBack gateway. This works by receing two numbers via SMS and have two UAC call remote SIP IP-PSTN Gateways and connect the media of the two remote gateways in an endpoint to endpoint manner. Another sample is what we call psuedo conference. Its a 1800 number that two persons can call and is terminated to a B2BUA that connects the media from that 1800 number. The reason for this is limiting a conference to two legs does not require media to be mixed and thus wouldnt need any special DSP devices to do RTP mixing/transcoding. This is UAS to UAS. Do you have a another terms on what to call these products aside from a B2BUA which implements UAC to UAC and UAS to UAS? Call it any other name you want. It would still fall under the RFC's definition of a B2BUA. Joegen ----- Original Message ----- From: "Sindhur Satrasala" <[EMAIL PROTECTED]> To: "'Chris Boulton'" <[EMAIL PROTECTED]>; "'Ganesh Jayadevan'" <[EMAIL PROTECTED]> Cc: <[EMAIL PROTECTED]> Sent: Tuesday, September 30, 2003 2:08 AM Subject: RE: [Sip-implementors] request for clarification of definition(b2bua)*This message was transferred with a trial version of CommuniGate(tm) Pro* Precisely what I meant!! It can be a UAC-UAC ( = UAC) or a UAS-UAS ( = UAS) But if you call it a B2BUA it's a UAC-UAS(period) Best regards, ======================================= Sindhur N. Satrasala Infomedia Network Inc. Houston TX 77058 Web: http://www.infomedia-network.com Email: [EMAIL PROTECTED] Ph-(281)218-0700: ex-15 Fax-(281)218-0749 ================ -----Original Message----- From: Chris Boulton [mailto:[EMAIL PROTECTED]] Sent: Monday, September 29, 2003 8:20 AM To: Sindhur Satrasala; Ganesh Jayadevan Cc: [EMAIL PROTECTED] Subject: RE: [Sip-implementors] request for clarification of definition(b2bua) << see in-line>>-----Original Message----- From: Sindhur Satrasala [mailto:[EMAIL PROTECTED]] Sent: 26 September 2003 20:03 To: 'Ganesh Jayadevan' Cc: [EMAIL PROTECTED] Subject: RE: [Sip-implementors] request for clarification of definition(b2bua) Ganesh: >From the RFC, "A back-to-back user agent (B2BUA) is a logical entity that receives a request and processes it as a user agent server (UAS). In order to determine how the request should be answered, it acts as a user agent client (UAC) and generates requests. Unlike a proxy server, it maintains dialog state and must participate in all requests sent on the dialogs it has established. Since it is a concatenation of a UAC and UAS, no explicit definitions are needed for its behavior."[Chris Boulton] 'Since it is a concatenation of a UAC and UAS, no explicitdefinitions are needed for its behavior.' This is as far as thedefinition goes - no rights or wrongs. It is simply a concatenation of the two elements. If it wants to act as a UAC-UAC, then it can, just as a standalone UAC would be able to initiate calls. That is all it is, two UA's glued together, with an association of state between them.Clearly it cannot a UAC-UAC concatenation; it is a server on one side and a client on the other side. As long as it processes requests it has a UAS functionality. Best Regards, ======================================= Sindhur N. Satrasala Infomedia Network Inc. Houston TX 77058 Web: http://www.infomedia-network.com Email: [EMAIL PROTECTED] Ph-(281)218-0700: ex-15 Fax-(281)218-0749 ================ -----Original Message----- From: Ganesh Jayadevan [mailto:[EMAIL PROTECTED]] Sent: Monday, September 22, 2003 8:14 PM To: [EMAIL PROTECTED] Subject: [Sip-implementors] request for clarification of definition (b2bua) Folks, The term b2bua has a rather narrow definition in Section 6 of rfc3261. It refers to a UAS concatenated with a UAC for incoming requests into the UAS. Would it be incorrect to use the term b2bua to refer to a UAC-UAC concatenation? Thanks, Ganesh _______________________________________________ Sip-implementors mailing list [EMAIL PROTECTED] http://lists.cs.columbia.edu/mailman/listinfo/sip-implementors_______________________________________________ Sip-implementors mailing list [EMAIL PROTECTED] http://lists.cs.columbia.edu/mailman/listinfo/sip-implementors
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