radhakrishna wrote: > What is the difference between Dialog Stateful proxy and Call Stateful > proxy?
I used these terms informally. But definitions should follow directly from the names: - a dialog stateful proxy will maintain dialog state, which consists primarily of callid, cseq, local and remote targets (contacts), and route set. - a call stateful proxy, in addition to being dialog stateful, will maintain call state, which will be details about offer/answer status and current media streams. > Can you pls add info to Registration Stateful proxy also? - by registration stateful I meant something a proxy that keeps some kind of information about registrations it has processed. For instance IMS expects its P-CSCFs to do this. They remember things like the Path negotiated in the registration. > RadhaKrishna. Manikonda > Software Engineer > 3rd Floor, Ext: 1546 > Leela Palace, Airport Road > Bangalore: 560008 > Ph: 080-41781770 > 91-9986003454 > > > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of Paul Kyzivat > Sent: Tuesday, February 28, 2006 6:46 PM > To: [EMAIL PROTECTED] > Cc: [email protected] > Subject: Re: [Sip-implementors] Difference between a BBUA and stateful proxy > > > > [EMAIL PROTECTED] wrote: > >>Can somebody tell me the exact difference between a BBUA and a stateful >>proxy? > > > Whether it is stateful or not, a proxy must obey certain rules (in 3261) > about what it may, and may not, do. A UA has different, less restrictive > rules. A B2BUA *can* function in a manner similar to that of a proxy, in > that messages coming in one side typically result in a related message > going out the other side. But because it is a UA to can do things a > proxy is not permitted to do. > > For instance, a node could act exactly like a proxy, but store dialog > state. (Hence be a "stateful proxy".) At some point it might use that > state to enable it to send a BYE, terminating the dialog. At the moment > it does that it ceases to be a proxy and becomes a B2BUA. > > Note that neither B2BUA nor Stateful Proxy are very precise terms. > B2BUAs can be very much like proxies, as above. But there are other > kinds of B2BUAs, such as conference foci and 3pcc controllers, that bear > little resemblance to a proxy. Stateful proxies vary depending on how > much state they contain. At the simplest level there are stateless > proxies, transaction stateful proxies, dialog stateful proxies, call > stateful proxies, and registration stateful proxies. > > Paul > _______________________________________________ > Sip-implementors mailing list > [email protected] > https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors > _______________________________________________ Sip-implementors mailing list [email protected] https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
