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CO Line
Operation
Incoming calls signaling on CO line 1 and CO Line 2 display as follows:
Conditions
Only those stations with corresponding CO line ring and receive assignments display
current incoming CO line call status. CO line receive must be enabled for the station.
When the remote party abandons the incoming call before it is answered, the
incoming call signaling of the affected CO line will be removed after (1.6 to 6.4 sec.),
depending on the connected CO.
Only the attendant is allowed to receive external CO line ring and can answer all
incoming CO line calls.
Type Assignment
Description
Each CO line can be assigned as PBX, CO, EMPTY, or PAGE. The Empty Assignment is
reserved for CO lines equipped on the system, but not connected to telephone company
network facilities.
Empty Type (open designation) alerts the system that this CO line should not be used to
place outgoing calls when system features are invoked which initiate automatic CO line
selection.
PBX CO Line Type invokes other system automatic operations for handling PBX Station-
to-Station calls and PBX trunk calls, separately. When a programmed PBX trunk access
code is dialed, the system is alerted that the user is accessing a telephone company
facility to make a network call. When this occurs, the system monitors digits dialed after
the PBX access code and compares them against the Allowed Digit Interval Table in the
COS for that station. The programmed PBX Trunk access code also notifies the system
that a pause should be inserted when redialing telephone numbers dialed on that CO
line beginning with the PBX access code. This operation applies for Speed Dial, Last
Number Redial, Save Dialed Number, User Save Number Redial, and Automatic Busy
Redial.
Page Type is designated so a CO Line can be used as a paging port. Doing so takes a CO
line out of Hunt, so it will not be accessed by pressing 9.
CO Line Type Assignment indicates that the CO line is a direct telephone company
facility access CO line. Toll Restriction monitoring is commenced from the first digit
dialed and no other special call handling characteristics are implemented on CO lines of
this type. At default, CO line type is set to CO for all CO lines.
Chapt er 3 - Key Station Features, Opera tion, and Programming
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