Nortel Meridian Meridian 1 Feature Description And Administration page 1446

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Table 103
Service collision outcome (Part 2 of 2)
Previous Near-end
Status
OOS-NE
OOS-FE
OOS-NE
OOS-FE
IS
IS
IS
IS
Operating parameters
553-2901-301 Standard 9.00 January 2002
NI-2 B-channel Service Messaging
Status Sent in
Service Message
OOS
OOS
OOS
OOS
IS
IS
OOS
OOS
The NI-2 B-channel Service Messaging feature operates on any Meridian 1
configured with a D-channel interface. The following PRI cards do not
support the NI-2 B-channel Service Messaging feature:
• QPC757 Primary Rate Interface card.
• NTAK93 D-Channel Handler Interface card.
For the NI-2 B-channel Service Messaging feature, the far-end must support
B-channel service messaging.
On an outgoing call, if the far-end triggers channel negotiation, an alternate
channel is assigned. If the alternate B-channel has a near-end status of
OOS-FE, the channel negotiation is accepted and the channel is placed in IS
status. Otherwise, a Release Complete message is sent or a channel
negotiation is triggered again.
When a setup message is received requesting an OOS channel, a Release
Complete message is sent or a channel negotiation is performed. However, if
the requested B-channel is OOS-FE, the status is changed to IS and the call is
accepted.
Colliding Status
Received
IS
IS
OOS
OOS
IS
OOS
IS
OOS
Final Near-end
Status
OOS-NE
OOS-NE
OOS-NE
OOS-NE
IS
OOS-FE
OOS-NE
OOS-NE