Message Center Interface (Mci) - NEC NEAX 2000 IPS Reference Manual

Chapter 19 Voice Messaging Systems

Message Center Interface (MCI)

This feature provides an interface with a NEC supplied Voice Mail System (VMS), which can
send Message Waiting lamp control data to the system. The Message Center Interface (MCI)
can provide the following operations:
1. When terminating the call to the VMS, the system sends call connection status information to the
VMS through the MCI.
2. The VMS sends the Message Waiting Lamp on data to the MCI.
3. The system, upon receiving this control data from the MCI, illuminates the Message Waiting lamp of
the corresponding station.
4. The VMS, upon receiving retrieved message information, will send the Message Waiting lamp
control data requesting the system to extinguish the Message Waiting lamp of the corresponding
station.
5. The MCI interface is a half-duplex, RS232C, asynchronous data link that operates under a specific
message protocol and format. The data link hardware consists of a RS-232C serial interface to the
PBX. The characteristics of the link, the protocol used, and the message text are shown below.
Item
Data Rate
Operating Mode:
Electrical Interface
Characteristic:
Signal Form:
Interface Distance:
Word Framing:
Parity* VRC:
Frame Contents:
Control:
Priority Sequence:
MCI Service Conditions
1. The UCD or Station Hunting feature is usually provided with the VMS station.
2. One RS-232C port on the MP card or the Application Processor (AP00) is required to make a data
link with a customer supplied VMS.
3. Messages can be retrieved from any Multiline Terminal, DTMF telephone, or the Attendant
Console, but not from DP telephones.
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1200, 2400, 4800, 9600 bps asynchronous, software
selectable
Half duplex
EIA RS-232C electrical standard interface
EIA RS-404
Max. 15 m (49.2 ft.) between PBX and VMS (without modem)
Note: When modems are used, full duplex asynchronous type
modems are required.
10 bits (1 start, 7 data, 2 stop)
No parity, even parity, odd parity; selected by PBX system
data
US ASCII 7-bit codes
Contention
Primary station: PBX
Secondary station: VMS
Description
NEAX 2000 IPS Request for Proposal (RFP) Reference Guide
NDA-24349, Issue 4