Hangup command

Users,

I have a piece of telephone equipment that I have hooked up to my conserver 
which needs conserver to close (hangup) the serial interface when the user 
logs out.  I have scoured through the man pages and cannot find anything. 
I have tried sending the down command and then re-opening the connection, 
but that is not producing the signaling needed by the device to terminate 
the shell that it operates.

Does anyone have any suggestions, on things that I might try?

Brandon

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