2N NetStar Admin manual - Manual (Page 47)

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3.4 CO
The CO virtual port is an analogue virtual port for connection of a CO (central
exchange) analogue line. Since it has only a DTMF transmitter, it is unable to detect
the DTMF. Therefore, route an incoming call directly to the final destination, or assign
the DISA function to the virtual port to detect the DTMF symbols and route the call to
the required destination. The parameters are divided into logical sections.
Basic
Stack status
This field displays information on the stack and its current status. With a CO virtual
port you can see the following statuses:
null
config
on_hook
off_hook
error_stop
error_start_req
Figure: View of CO Virtual Port Hardware Configuration