I have a CUCM 6.1.3 cluster (2 nodes) with 2 GW2811 (using H323), each one with 1xPRI to PSTN.
Redundancy is correctly managed for incoming and outgoing calls for all scenarios except one: when a voice GW is network-isolated.
The problem is when a GW is not able to reach CUCM nodes, its PRI line is still up, and PSTN continues to send incoming calls using Round-Robin to E1 interface. Because the serial interface is up but the VoIP side is not reachable, 1/2 incoming calls are busy.
I never used the busyout command but maybe it could be a solution.
The best solution would be to shut the serial interface when the IP addresses of CUCM are not reachable.
However, I saw in the documentation I have to use call fallback and SAA capabilities and I don't know if CUCM could be a supported end for SAA...
My question is: how can I configure busyout or any other command to shut serial interface when the GW is not able to reach CUCM. If I can do that, all incoming calls will be routed to the second gateway only from PSTN.
Thank you very much for your advices.