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1.5 Making Call Features
46 Feature Guide
1.5.2.6 CO Busy Out
Description
The PBX can monitor the loop current sent through outside (CO) lines, preventing users from seizing lines
where a loop current is not detected. When loop currents are not detected, outside (CO) lines are set to
Busy Out status, and cannot be used to make calls ( CO Busy Out [154]). An outside (CO) line in Busy
Out status cannot be selected for making a call by Automatic Line Access or Outside (CO) Line Group
Access, or by using the Other-CO (O-CO) button. If a user tries to seize an outside (CO) line set to Busy
Out status, the user will hear a reorder tone and a message is shown on the display of the Proprietary
Telephone (PT).
This is useful if some or all outside (CO) lines are occasionally unavailable because of problems with the
external telecommunications environment.
Conditions
• Loop current detection is performed on active outside (CO) lines whenever the line is seized and/or at
a preprogrammed time every day.
• By performing loop current detection at a preprogrammed time every day ( CO Busy Out Check Time
[155]), or pressing the corresponding Single-CO (S-CO) button on a PT, an outside (CO) line can be
returned to in-service status once a loop current is detected. Also, selecting "Disable" in CO Busy Out
[154] returns all outside (CO) lines to in-service status.
• Incoming calls can be received on outside (CO) lines set to Busy Out status. In this case, Busy Out
status is cleared.
• Busy Out status is maintained even when the PBX is restarted.