AudioCodes Mediant 1000

User's Manual 1014 Document #: LTRT-27045
Mediant 1000B Gateway & E-SBC
Parameter Description
- Fully configured trunk (all channels): The device rejects new
incoming calls, disconnects busy channels, and takes the D-
channel down.
- Partially configured trunk (only some channels configured):
The device rejects new incoming calls, disconnects busy
channels, and sends out-of-service Service messages to all the
configured channels (D-channel remains up).

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
(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/unlocking Trunk Groups in the Trunk Group Settings
table, see Configuring Trunk Group Settings on page 467.
 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.
 If the ISDN variant does not support the configured out-of-service
option of the parameter, the device sets the parameter to Default
[0].