Locking and Unlocking Trunk Groups

You can lock a Trunk Group to take its trunks (and their channels) out of service. When you initiate a lock, the device rejects all new incoming calls for the Trunk Group and immediately terminates active calls (busy channels), eventually taking the entire Trunk Group out of service.

You can lock a Trunk Group “gracefully”, whereby the device rejects new incoming calls, but terminates busy channels only after a user-defined graceful period if they are still busy by the end of the period. When configured to 0, graceful lock is disabled.

When you lock a Trunk Group, the method for taking channels out-of-service is determined by the following parameters:

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DigitalOOSBehaviorForTrunk parameter per trunk or DigitalOOSBehavior parameter for all trunks.

If you have configured registration for the Trunk Group (see the 'Registration Mode' parameter in the Trunk Group Settings table) and you subsequently lock the Trunk Group, it stops performing registration requests (un-registers) with the Serving IP Group with which you have configured it to register. When you unlock such a Trunk Group, it starts performing registration requests (re-registers) with the Serving IP Group once its trunks return to service.

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To lock or unlock a Trunk Group:

1.

Configure a graceful lock:

a.

Open the Gateway Advanced Settings page (Setup menu > Signaling & Media tab > Gateway folder > Gateway Advanced Settings).

b.

In the 'Graceful Busy Out Timeout' (GracefulBusyOutTimeout) field, enter the period after which the Trunk Group is locked:

c.

Click Apply.

2.

Lock the Trunk Group:

a.

Open the Trunk Group Settings table (see Configuring Trunk Group Settings).

b.

Select the row of the Trunk Group that you want to lock or unlock.

c.

Click the Action button located on the table's toolbar, and then from the drop-down list, choose one of the following:

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Lock: Locks the Trunk Group.

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Un-Lock: Unlocks a locked Trunk Group.

The Trunk Group Settings table provides the following read-only fields related to locking and unlocking of a Trunk Group:

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'Admin State': Displays the administrators state - "Locked" or "Unlocked"

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'Status': Displays the current status of the channels in the Trunk Group:

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"In Service": Indicates that all channels in the Trunk Group are in service, for example, when the Trunk Group is unlocked or Busy Out state cleared (see the EnableBusyOut parameter for more information).

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"Going Out Of Service": Appears as soon as you choose the Lock button and indicates that the device is starting to lock the Trunk Group and take channels out of service.

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"Going Out Of Service (<duration remaining of graceful period> sec / <number of calls still active> calls)": Appears when the device is locking the Trunk Group and indicates the number of buys channels and the time remaining until the graceful period ends, after which the device locks the channels regardless of whether the call has ended or not.

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"Out Of Service": All fully configured trunks in the Trunk Group are out of service, for example, when the Trunk Group is locked or in Busy Out state (see the EnableBusyOut parameter).