Auto attendant just keep going and analog FXO trunk seized after incoming caller hangs up

[Anonymous]

I have a 7100 with analog centrex lines as trunk lines terminating on FXO interfaces. When the auto attendant answers and the calling party hangs up the auto attendant just keeps going and keeps the trunk tied up. Any ideas?? It seems like a call supervision issue but I've gone into to CLI and tried just about every supervision setting there is on the trunk (not FXO) interface.

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[Anonymous]

Shawn, the 7100 has no way to know that the remote calling party has hung up without the provider terminating the call. From the 7100 side, I would make sure you've run ERL tests just to make sure the lines are at the correct impedence, but assuming that has been done, you'd need to contact the provider to troubleshoot from their end. Thanks

Jay

[Anonymous]

Shawn, some additional clarification about what your provider will likely need to do. The service provider will likely need to provision your lines for Network Disconnect, also called Forward Disconnect. A Network Disconnect signal is a period where the network removes voltage between tip and ring, which we will detect and use as a signal to tear down the call.

Thanks

Jay