AudioCodes Mediant 500 E-SBC User Manual page 550

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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).
Note:
•
If the device is reset, a locked Trunk Group remains locked. If the device is reset
while graceful lock is in progress, the Trunk Group is forced to lock immediately
after the device finishes its reset.
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When the deviceis in High Availability (HA) mode:
√
After an HA switchover, a locked Trunk Group remains locked.
√
If an HA switchover is initiated while a Trunk Group is in locking progress, the
locking process is stopped and only starts again (with the configured graceful
period) once switchover completes.
√
When HA status is in "Synchronizing" state, the Trunk Group status is not
updated in the Trunk Group Settings table. In addition, the lock/unlock actions
cannot be invoked during this time. When HA synchronization finishes and HA
status is in "Operational" state, the Trunk Group Settings table is refreshed with
the lock/unlock status. The HA state is displayed on the Home page.
User's Manual 550
Mediant 500 E-SBC
Document #: LTRT-10437