Check the CO timers in PGM 180, specifically the call restriction timer which should be set to 0

CO Call Restriction Timer -- N/A
If value is set to 0, the time of outgoing CO calls is not
restricted. If value is set to a non-zero value, outgoing
CO calls are disconnected after the designated time.

Also check the CO release guard timer.

CO Release Guard Timer - designates the amount of
time before a CO line can be re-seized, after a CO call
disconnects; controls the time necessary to
guarantee an idle loop state when a line is released.


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