AudioCodes Mediant 500 E-SBC, User Manual

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User's Manual 54. Configuration Parameters Reference
Version 6.8 775 Mediant 500 E-SBC
Parameter Description
out-of-service only after the graceful period expires, by sending
out-of-service Service messages to the B-channels.
When connectivity is restored for the Busy Out feature or the Trunk
Group is unlocked, the device brings all the trunks back into service
by sending in-service Service messages to all their B-channels.

[2] D-Channel = (Applicable only to ISDN and fully configured
trunks) Takes the D-channel down or brings it up.

Graceful out-of-service disabled: The device rejects new
incoming calls and immediately takes the D-channel down.

Graceful out-of-service enabled: The device rejects new
incoming calls. Only when all channels are idle (when graceful
period ends or when all channels become idle before graceful
period ends, whichever occurs first), does the device take the
D-channel down.
When connectivity is restored for the Busy Out feature or the Trunk
Group is unlocked, the device brings the D-channels up again.
Note: For partially configured trunks (only some channels
configured), this option only rejects new calls for the trunk; the D-
channel remains up.

[3] Alarm = Sends or clears a PSTN Alarm Indication Signal (AIS)
alarm.

Graceful out-of-service enabled: The device rejects new
incoming calls and immediately sends an AIS alarm.

Graceful out-of-service enabled: The device rejects new
incoming calls and only when all channels are idle (when
graceful period ends or when all channels become idle before
graceful period ends, whichever occurs first), does the device
send an alarm on the trunk.
When connectivity is restored for the Busy Out feature or the Trunk
Group is unlocked, the device clears the alarm.
Note: For partially configured trunks (only some channels
configured), this option only rejects new calls for the trunk; no alarm
is sent.

[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).

Graceful out-of-service enabled: The device rejects new
incoming calls and blocks all channels (idle and busy) only
when the graceful period expires.
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 and only takes the D-channel down.
- Partially configured trunk (only some channels configured):
The device rejects new incoming calls 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