My Customer is running Call Manager version 3.3(5) and has 4 1700 series routers each with 1 E1 circuit configured as H323 gateways. Last week when the carrier's circuit on the first choice gateway went down; (loss of layer 1); outgoing PSTN calls did not route out of the second choice gateway in the route list. I believe this is due to the fact that these gateways are configured at H323 gateways and there is no signal between the gateway and Call Manager to indicate the loss of E1, whereas if they had been configured as MGCP gateways, the Call Manager would have detected this and routed all subsequent calls out of the 2nd gateway in the list. Am I right?
Hi, by default Callmanager stops routing on Unallocated number message from gateway, so if E1 is down, it receives this message and tells that number is unavailable. In order to make callmanager to go through second gateway in route list just set Callmanager Service Parameter "Stop Routing on Unallocated Number Flag" to "False".