Hi Karthik, As you stated below the B2BUA role is mainly for any kind of services. It could be PBX, Annoucement, conferencing or for security.
In general SIP proxy provides the routing of sip messages. B2BUA is a kind of functionality and if you like you can implement together in the same physical box as SIP proxy. Services can be implemented in terminals and some services are implemented in the network with Application servers. Application servers are a kind of B2BUAs Regards Krishna > > Message: 1 > Date: Tue, 23 Sep 2008 14:50:15 +0530 > From: "karthik karthik" <[EMAIL PROTECTED]> > Subject: [Sip-implementors] why do we need b2bua? > To: sip-implementors@lists.cs.columbia.edu > Message-ID: > <[EMAIL PROTECTED]> > Content-Type: text/plain; charset=ISO-8859-1 > > Hello, > Here is a question which I have for long time. > What is the prupose of having B2BUA? > I know that the B2BUA changes from tag, > callid and maintains a seperate dialog when to tag is received. > > But why it does change in these headers? > Some say it is for security reasons? > If yes how is it used for security. We also have NAT for security. > > Some say it is for manipulation of supplementary services. If yes, > cant a statefull proxy handle the services > without changing call-id, from tag and to tag? > > Thanks Karthik Prabhu > > > _______________________________________________ Sip-implementors mailing list Sip-implementors@lists.cs.columbia.edu https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
