Hi Gururaj, Thanks for the clarification. I am more concerned about how it is used in the case of a mobile service provider supporting SIP.
If User A wants to contact User B, he sends an INVITE directed to the SIP Proxy located at the service station. This Proxy has to locate User B and then connect A to B. This would need a fresh INVITE from Proxy to B and then a reINVITE from Proxy to A. This proxy also has to take care of charging User A for the call he has made. Can a normal Proxy take care of all these things? Or is every service provider using only a B2BUA? Regards, Priya. On 12/6/05, [EMAIL PROTECTED] < [EMAIL PROTECTED]> wrote: > > > > > > Hi priya, > > B2BUA is not just an stateful proxy. Its much more complicated to write > B2BUA than > even a stateful proxy. A B2BUA would for example need to handle PRACK, > probably > SUBSCRIBE/NOTIFY and any future extensions that you want to use. A > stateful > proxy > does not need to change when a new extension is introduced, since it just > passes > SUBSCRIBE/NOTIFY/PRACK/WHATEVER on. > > If you just want to route SIP messages you do not need a B2BUA. If you > want > to hide one > side from the other (for anonymity for example), then you do require > B2BUA. > > Rgds, > Gururaj K. > > > > > priya pandit > <[EMAIL PROTECTED] > ail.com> To > Sent by: [email protected] > sip-implementors- cc > [EMAIL PROTECTED] > ia.edu Subject > [Sip-implementors] Real time usage > > 12/06/2005 11:51 > AM > > > > > > > > Hi, > Please correct me if I am wrong. > B2BUA is a stateful proxy that performs third party call control. > > Do all the service providers, (for ex. mobile services providers > supporting > SIP) use only a B2BUA and never a SIP stateless proxy since B2BUA can > maintain states and connect two users, provides other voice and data > services and helps in billing? > > Regards, > Priya. > _______________________________________________ > Sip-implementors mailing list > [email protected] > https://lists.cs.columbia.edu/mailman/listinfo/sip-implementors > > > > *********************** FSS-Unclassified *********************** > "DISCLAIMER: This message is proprietary to Hughes Software Systems > Limited > (HSS) and is intended solely for the use of the individual to whom it is > addressed. It may contain privileged or confidential information and > should not be circulated or used for any purpose other than for what it is > intended. If you have received this message in error, please notify the > originator immediately. If you are not the intended recipient, you are > notified that you are strictly prohibited from using, copying, altering, > or > disclosing the contents of this message. HSS accepts no responsibility for > loss or damage arising from the use of the information transmitted by this > email including damage from virus." > > _______________________________________________ Sip-implementors mailing list [email protected] https://lists.cs.columbia.edu/mailman/listinfo/sip-implementors
