Olivier Beytrison schrieb: > I don't think so. Because th P-CSCF address will be mostly assigned by > DHCP Option. Because when you're are moving with your device, you move > from one area to another one covered by annother GGSN, which mean you'll > have to contact a new P-CSCF, this without invalidating your registration. > > The Registrar (S-CSCF) know where to send back the requests only because > it is listed in the Route/Record-Route from every request. So the P-CSCF > Address is not asserted in the Service-Route in the 200 OK following a > successful registration. In the 3G book from Gonzalo Camarillo, the Service Route only includes the S-CSCF (no P and no I). Nevertheless I think Benny is right: without reREGISTRATION after changing the P-CSCF the client can not receive incoming calls (still routed to old P-CSCF using the old path). klaus
