Nortel Meridian Meridian 1 Feature Description And Administration page 1447

Feature interactions
Feature packaging
NI-2 B-channel Service Messaging
With no existing call on the channel, B-channel Service messaging activates
the B-channel to IS status. When there is a call on the B-channel, B-channel
restart messaging is used.
The B-channel is placed in a lockout state when a restart message is sent. The
lockout ends on receipt of a restart acknowledgement from the far-end. Calls
cannot be placed on B-channels in the lockout state.
The identity of B-channels in the OOS-NE state are included in the PRI restart
message.
To disable a PRI loop, corresponding D-channels are disabled. In this state,
the B-channel service messaging is not active.
When a backup D-channel becomes active the restart procedure is triggered.
Service messages containing B-channel status information are sent to all
far-end B-channels in the OOS state.
If a colliding service message is received, the T323 timer stops and the
original message does not retransmit.
There are no feature interactions associated with this feature.
The NI-2 B-channel Service messaging feature requires the following
packages:
• ISDN Signaling (ISDN) package 145
• Primary Rate Access (PRA) package 146
• Multi-Serial Data Link (MSDL) package 222
• National Interface (NI-2) package 291
International ISDN PRI Feature description and administration
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