I've got a configuration where we have an SRV record for the outbound proxy that the phones use to register and make calls.
things work fine when the primary proxy is up, however when the primary is down I get interesting behavior. The phone will come up and register properly with the secondary server and it can receive calls successfully.
When we go to place an outbound call we get the strange behavior. When you place a call the phone first sends 4 SUBSCRIBE messages to the primary SBC, that it's not registered to, then it send the SUBSCRIBE and INVITE to the secondary proxy that it is registered to and the call goes through successfully.
Is there a way to modify the behavior so that the phone always sends the SUBSCRIBE to the registered server?
Thanks,
-David
