If you have configured non-facility associated signaling on your ISDN trunks, you might have set up a backup D-channel as well as a primary D-channel. If the primary D-channel goes out of service, the backup automatically takes over the transport of signaling traffic. You can use the channel operating status window to manually disable the primary D-channel and force the backup D-channel to take over.
- At the Welcome window, select Operations —> System Monitor
- Click one of the active push buttons under Channels in the System
Monitor window.
The system displays the channel operating status window:The active signaling channel appears in blue and the standby signaling channel appears in yellow.
- Click on the active signaling channel for your NFAS group.
The system displays the channel operating status window.
- Select Disable.
The channel goes out of service (Os) and the backup D-channel automatically changes from standby (St) to signaling active (Sg).
If you subsequently re-enable the primary D-channel, it will come back into service in standby mode.