User's Manual 784 Document #: LTRT-10532
Mediant 500L Gateway & E-SBC
(Digital Interfaces Only) 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 trunks/channels out-of-service is
determined by the following parameters:
DigitalOOSBehaviorForTrunk parameter per trunk or DigitalOOSBehavior parameter
for all trunks.
FXS interfaces: FXSOOSBehavior parameter
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.
To lock or unlock a Trunk Group:
1. Configure 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:
Figure 43-1: Configuring Graceful Lock Period
c. Click Apply.
2. Lock the Trunk Group:
a. Open the Trunk Group Settings table (see ''Configuring Trunk Group Settings'' on
page 503).
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:
♦ Lock: Locks the Trunk Group.
♦ 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:
'Admin State': Displays the administrators state - "Locked" or "Unlocked"
'Status': Displays the current status of the channels in the Trunk Group:
• "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).
• "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.
• "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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