FXO port not releasing calls that have hung up

[Mike Buyarski]

We have cme in the Kansas City Area and every few weeks we get FXO ports that will not release the line its when a user hangs up. the issues clears for a couple weeks after i do a shut/no shut on the FXO interface. i'm trying to figure out how to stop this from happening.

I am running CME 10.0 on cisco 2901 running 15.4(2)T

Here is my config on all the voice ports

voice-port 0/X/X
 trunk-group ALL_FXO
 output attenuation -2
 connection plar opx XXXX
 description XXX-XXX-XXXX
 caller-id enable

At this point i have not seen any pattern on which ports this happens to.

[David Babiano Rodriguez]

Hi,

I don't know how are the lines in US. But here in Spain, you must configure the "battery-reversal" command on every FXO port. The PSTN send to the customer a polarity change to notify the call end....

You can try it.... I hope to help you!!

David.

[Suresh Hudda]

apart from David (+5) suggestion, you can try to give below command under voice port.

timeouts wait-release 1

Suresh

[David Babiano Rodriguez]

Thanks for your +5!!! 

David

[Mike Buyarski]

i will try it however it could be a few weeks before i know if it worked

[rothomas2]

There are some debugs you can use to detect which type of disconnect supervision your TELCO supports, and configure accordingly.