2.5.4.6 Trunk Busy OutDescriptionThe PBX can monitor the loop current sent through analogue trunks, preventing users from seizing trunkswhere 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 aTIE line, as part of a trunk group, or with the ARS feature, and cannot receive trunk calls. If a user tries to seizea 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 externaltelecommunications environment.Conditions• 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 trunkto in-service status once a loop current is detected. An extension assigned as the manager can manuallychange 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.• Busy Out status is cleared when:– a call is successfully received (i.e., a loop current is detected) on that trunk.– the S-CO button for that trunk is pressed and a loop current is detected.PC Programming Manual References9.24 PBX Configuration—[1-1] Configuration—Slot—Port Property - LCO Port— Busy Out Status10.6.1 PBX Configuration—[2-6-1] System—Numbering Plan—Main—Features— Busy Out Cancel10.7.1 PBX Configuration—[2-7-1] System—Class of Service—COS Settings—Manager— Manager10.9 PBX Configuration—[2-9] System—System Options—Option 5— Busy Out—Busy Out for AnalogueCOPT Programming Manual References[511] Manager AssignmentFeature Guide References5.1.6 Manager FeaturesUser Manual References2.1.6 Allowing Users to Seize an Unavailable Outside Line (Trunk Busy Out)110 Feature Guide2.5.4 Trunk Call Features
