AudioCodes Mediant 800 User Manual page 609

CHAPTER 23 Digital PSTN
Parameter
Mediant 800 Gateway & E-SBC | User's Manual
✔
Graceful out-of-service enabled: The device rejects
new incoming calls and does the following:
- Fully configured trunk (all channels):
> If all channels are idle when the graceful period
begins, the device immediately takes the channels
out-of-service without sending out-of-service Service
messages and instead, only takes the D-channel
down.
> If at least one channel is busy during the graceful
period, the device immediately takes all idle channels
out-of-service and sends out-of-service Service
messages to these B-channels. Thus, the PSTN/PBX
side can detect that these calls are in out-of-service
state and does not send new calls to these out-of-
service channels, eliminating the scenario of loss of
calls due to rejection.
> If a channel is released (call ends) during the
graceful period and there are still other busy channels,
the device sends an out-of-service Service message
to the idle channel.
> When the last channel is released in the trunk (or
Trunk Group), the device takes all the channels out-of-
service (locks the Trunk Group) without sending an
out-of-service Service message; instead, it only takes
the D-channel down. The device disconnects busy
channels before it takes the D-channel down.
When connectivity is restored for the Busy Out feature
or the Trunk Group is unlocked, the device brings the
D-channel up again without sending any Service
messages to the B-channels.
- Partially configured trunk (only some channels
configured): Same as above, but the D-channel
remains up and out-of-service Service message is
sent to remaining busy channels.
Note:
■ The parameter is applicable only to digital interfaces.
■ When configuring out-of-service behavior per trunk (see
[DigitalOOSBehaviorForTrunk_x]), you must stop the
trunk (Stop Trunk button in the Trunk Settings page),
configure the parameter, and then restart the trunk (Apply
Trunk Settings button in the Trunk Settings page) for the
settings to take effect.
■ To define out-of-service behavior for all trunks (globally),
see the [DigitalOOSBehavior] parameter.
■ For locking and unlocking Trunk Groups in the Trunk Group
Settings table, see Configuring Trunk Group
■ For a description of the Busy Out feature and for enabling
the feature, see the [EnableBusyOut] parameter.
■ To configure the graceful out-of-service period, see the
[GracefulBusyOutTimeout] parameter.
- 569 -
Description
Settings.