FXO port stays active after call has ended

[kilias]

Dear all

I have a CME (Cisco 4331,Version 16.09.02, CME version 12.3) installation and I am facing the following issue:

CME has a 4 FXO NIM with 3 PSTN lines on it, which works fairly well.

However, when the customer forwards the calls to his mobile from an IP Phone, the connection is made successfully but when the call is ended the FXO ports involved (1 incoming  and 1 outgoing), remain active for very long time which results for these two PSTN lines to be useless all this time.

I have attached the CME configuration.

Looking forward for your suggestions

Regards

[Jonathan Schulenberg]

Ask the provider to use ground start instead of loop start.
https://www.cisco.com/c/en/us/support/docs/voice/analog-signaling-e-m-did-fxs-fxo/8120-fxo-disconnect.html

[kilias]

Hello Jonathan

Can you please provide a sample configuration for
the fxo port using ground-start?

Thank you