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ISDN Feature Plus
357
Administration for Network Connectivity
555-233-504 — Issue 1 — April 2000 CID: 77730
B Private Networking
Interrogation
When performing an audit, the Served User PBX sends a request towards the
Message Center PBX. As a Message Center PBX, the DEFINITY ECS receives the
request message, maps it into a MW STATUS REQUEST - SINGLE STATION
message, and sends it to AUDIX on the BX.25 link. When AUDIX replies to the
DEFINITY on the BX.25 link with a MW STATUS UPDATE, the Message Center
PBX sends the information on to the appropriate Served User PBX.
• If it is a Message Center PBX, the MW STATUS UPDATE indicates whether
there are any messages waiting, not how many messages are waiting or what
media types are these messages. If the MW STATUS UPDATE indicates that there
are new messages, then the Message Center PBX sends a message telling the
Served User PBX to activate the message waiting indication. Similarly, if the MW
STATUS UPDATE indicates that there are no new messages, then the Message
Center PBX sends a message telling the Served User PBX to deactivate the
message waiting indication.
• If it is a Served User PBX, when the Served User PBX receives the result, it
makes sure that the result received from the Message Center matches the state of
the Served User’s light.
Interactions
• Automatic Circuit Assurance
Automatic Circuit Assurance (including Referrals) is not activated for calls
terminating at the Feature Plus extension.
• Distributed Communication System (DCS)
Feature Plus signaling links do not support DCS.
• Feature Plus Centralized AUDIX
~ Calling Line Identification Presentation (CLIP)
If the public network supports CLIP and the called user has subscribed to the
service, calling party information is available to the called user when messages
are retrieved.
~ Feature Plus Diversion
Feature Plus Centralized AUDIX relies upon Feature Plus Diversion. When a
call covers to AUDIX, it must invoke Feature Plus Diversion to identify the
called party to AUDIX.
~ Feature Plus Message Waiting
When a calling party leaves a message using Feature Plus Centralized AUDIX,
Feature Plus Message Waiting engages and turns on that subscriber’s message
waiting indicator.