This issue can occur if an available route is not found in the indicated route list.
If the call fails on the current gateway, Cisco CallManager attempts to extend the call to the next route in the route list. This occurs until it reaches the last route. If the call cannot be completed using the last gateway, the Route List Exhausted event is logged.
These are the reasons for failing on the current gateway:
* Unallocated number like a non-existing destination
* Busy user
* Out of bandwidth
* Gateway fails to respond to the call setup request
When the gateway fails to respond to the call setup request, perform these steps:
1. Find out if the gateway was registered to Cisco CallManager at the time of the call.
2. If this event is not caused by similar failures, enable the detailed Cisco CallManager traces by following the procedures in Setting Up Cisco CallManager Traces for Cisco Technical Support.
3. You can also analyze the call setup and disconnection sequences by using the Q931Translator.exe located in C:\Program Files\Cisco\bin.
4. Additional routes may be needed in the indicated route list.
