In this case the UA should have a mechanism to consult a Location Server, for example an LDAP server. The presence of the user has to converted to a host name, and the entity that does is typically a location server. The other choice without the presence of a proxy server is of course to use a redirect server which is present in conjunction with the location server. Regards, Prasanna Huawei Tech., China
-----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of Affan Ahmed Sent: Tuesday, November 26, 2002 9:23 AM To: Rahul Gulati Cc: [EMAIL PROTECTED] Subject: Re: [Sip-implementors] Peer to Peer Call Hi Rahul, Sorry i wasnt probably clear enough. For the case when there are *no* proxies involved at all(configured seprately), and the calling UA is entered the address sip:[EMAIL PROTECTED] via a softphone GUI (where we assume joe is the computer name), how will the calling UA resolve the callee's IP? I know that in case we have proxies then the UAC will pass INVITE to its local proxy (which as u mentioned is either configured or found) and that shall resolve the example.com (using NAPTR or SRV records) to find its SIP proxies. The message will be then sent to the proxy in example.com where the INVITE would be sent. The proxy in example.com can then find joe in its own domain and send the INVITE (or non-INVITE) request to the UAS. But what about the proxy-less case? can any body please explain that. regards Affan Ahmed --- Rahul Gulati <[EMAIL PROTECTED]> wrote: > Hi, Affan, > > The "example" here refers to the Proxy Server of UA which is > initiating a > call, > either the config file at initiating UA has the mapping for "example" > and > its ip address or it can be learnt through DHCP methods. > > Best Regards' > Rahul > > ----- Original Message ----- > From: "Affan Ahmed" <[EMAIL PROTECTED]> > To: <[EMAIL PROTECTED]> > Sent: Monday, November 25, 2002 3:50 PM > Subject: [Sip-implementors] Peer to Peer Call > > > > Hello, > > I just wanted to clarify one point that dosent become clear to > *my* > > mind by simply reading the rfc. In the case when we a UA is > > establishing a peer to peer sip call, the does a URI mentioned like > : > > [EMAIL PROTECTED] resolve to a simple joe.example.com which can be > > resolved by a A or AAAA query or do we do something else. > > > > Obviously a DNS query of example.com would not be appropriate in > this > > case. So what to do in this case? > > > > I hope somebody out there can help me out on this! > > Affan Ahmed > > > > > > > > __________________________________________________ > > Do you Yahoo!? > > Yahoo! Mail Plus - Powerful. Affordable. Sign up now. > > http://mailplus.yahoo.com > > _______________________________________________ > > Sip-implementors mailing list > > [EMAIL PROTECTED] > > http://lists.cs.columbia.edu/mailman/listinfo/sip-implementors > __________________________________________________ Do you Yahoo!? Yahoo! Mail Plus - Powerful. Affordable. Sign up now. http://mailplus.yahoo.com _______________________________________________ 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
