The local voice busy out feature provides a way to busy out a voice port or DS-0 group (time slot) if a state change is detected in a monitored network interface (or interfaces). When a monitored interface changes to a specified state to out-of-service or in-service the voice port presents a seized/busy out condition to the attached private branch exchange (PBX) or other customer premises equipment (CPE). The PBX or other CPE can then attempt to select an alternate route.
When you troubleshoot ISDN trunks, you can make B-channels busy out. Issue the ds0 busyout X command under controller configuration mode for the channel associated signaling (CAS) trunk.
Router(config-controller)#ds0 busyout X
In order to busy out Common Channel Signaling (CCS) or ISDN PRI trunks, use the isdn service b_channel X state 2 command under interface configuration mode.
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