For Disconnect Supervision the Telco should provide that, however I have come across a rural location that they either couldn't or wouldn't.
I ended up installing a Viking Electronics CPC 1 device. It will manually generate the signal when the line is hung up. It was not on an IP office system but it worked ok, not perfect, Seems like I worked on it awhile to get to work like it should... see if you can get the CO to provide this service.
My guess is that this is for a problem with forwarding to an external number and the incoming calls don't disconnect?
You could route all calls through a shortcode and restrict the time for it with the t(5) to 5 minutes.
That will also cut off all calls to the internal people though so not the best solution.
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