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 > explicit > >definitions are needed for its behavior.' This is as far as the > definition 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 _______________________________________________ Sip-implementors mailing list [EMAIL PROTECTED] http://lists.cs.columbia.edu/mailman/listinfo/sip-implementors
