1.5 Making Call Features
96 Feature Guide
1.5.4.6 Trunk Busy Out
Description
The PBX can monitor the loop current sent through analogue trunks, preventing users from seizing trunks
where a loop current is not detected. When loop currents are not detected, trunks are set to Busy Out status,
and become unable to make or receive calls. A trunk in Busy Out status cannot be used for making calls as
a TIE line, as part of a trunk group, or with the ARS feature, and cannot receive trunk calls. If a user tries to
seize a trunk set to Busy Out status, the user will hear a reorder tone.
This is useful if some or all trunks are occasionally unavailable because of problems with the external
telecommunications environment.
Conditions
• This feature is not available for the following LCOT cards:
KX-TDA0181NE (LCOT16)
KX-TDA0180NE (LCOT8)
KX-TDA0183NE (LCOT4)
KX-TDA3180NE and KX-TDA3180AL (LCOT4)
KX-TDA3183NE and KX-TDA3183AL (LCOT2)
• Loop current detection is performed on active trunks whenever the trunk is seized and/or at fixed
intervals.
• When a trunk is in busy-out status, loop current detection is performed at fixed intervals, returning the
trunk to in-service status once a loop current is detected. An extension assigned as the manager can
manually change the trunk back to in-service status.
• Trunk status changes are recorded in the error log of the PBX.
• Busy Out status is maintained even when the PBX is reset.
Programming Manual References
PC Programming Manual
2.7.11 [1-1] Slot—LCO Port—Busy Out Status
2.8.8 [2-6-1] Numbering Plan—Main—Features—Busy Out Cancel
2.8.11 [2-7-1] Class of Service—COS Settings—Extension Feature—Manager
2.8.17 [2-9] System Options—Option 5—Busy Out—Busy Out for Analogue CO
PT Programming Manual
[511] Manager Assignment
Feature Guide References
2.2.6 Manager Features
User Manual References
2.1.6 Allowing Users to Seize an Unavailable Outside Line (Trunk Busy Out)
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