NEC NEAX 2000, Programming Manual

Page: 335 / 1200

MESSAGE CENTER INTERFACE (MCI)
SYSTEM OUTLINE
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A2315-10
MESSAGE CENTER INTERFACE (MCI)
SYSTEM OUTLINE
The Message Center Interface (MCI) provides an interface with a customer supplied Voice Mail
System (VMS) which can send Message Waiting lamp control data to the PBX.
The MCI can provide the following operations.
•
Incoming call information is sent to the VMS when terminating a call to the VMS.
•
Control of Message Waiting lamps is based on information sent from the VMS.
The MCI interface is a half duplex EIA-RS232C asynchronous data link that operates under a
specific message protocol and format.
The system outline of the MCI is shown below. The MCI requires the Application Processor
(AP00) to make a data link with a customer supplied VMS and the analog line circuit (LC/AUC)
to interface with the VMS.
•
AP00 card:
The AP00 stores call information for stations, and provides the MCI ports for a VMS.
The AP00 keeps supervising the status of the VMS. If the VMS is not ready for information
receiving (Busy Status), the AP00 temporarily stores the call information into its internal
memory. The AP00 is capable of storing call information of a maximum of 16 calls.
•
LC/AUC card:
The LC/AUC is used for the VMS stations. The UCD or Station Hunting feature is usually
provided with the VMS stations.