AudioCodes Mediant 800B User Manual page 1064

Parameter
User's Manual

[4] Block = (Applicable only to CAS) Blocks the B-channels.

Graceful out-of-service disabled: The device rejects new
incoming calls and immediately blocks all channels (idle and
busy). The device disconnects busy channels before blocking
them.

Graceful out-of-service enabled: The device rejects new
incoming calls. If at least one busy channel exists during the
graceful period, the device immediately blocks all idle channels,
and blocks the other B-channels as soon as they become idle.
When graceful period ends, the device disconnects all non-idle
channels and then blocks them.
When connectivity is restored for the Busy Out feature or the Trunk
Group is unlocked, the device unblocks all the B-channels.

[5] Service and D-Channel = (Applicable only to T1 ISDN variants
that support this method) Sends ISDN Service messages to
indicate out-of-service or in-service state and takes the D-channel
down or brings it up.

Graceful out-of-service disabled:
- 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.
1064
Mediant 800B Gateway & E-SBC
Description
Document #: LTRT-10298