NEC NEAX NDA-24349 - Manual (Page 386)

Chapter 19 Voice Messaging Systems
Page 19- 4 NEAX 2000 IPS Request for Proposal (RFP) Reference Guide
NDA-24349, Issue 4
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 Description
Data Rate 1200, 2400, 4800, 9600 bps asynchronous, software
selectable
Operating Mode: Half duplex
Electrical Interface
Characteristic: EIA RS-232C electrical standard interface
Signal Form: EIA RS-404
Interface Distance: Max. 15 m (49.2 ft.) between PBX and VMS (without modem)
Note: When modems are used, full duplex asynchronous type
modems are required.
Word Framing: 10 bits (1 start, 7 data, 2 stop)
Parity* VRC: No parity, even parity, odd parity; selected by PBX system
data
Frame Contents: US ASCII 7-bit codes
Control: Contention
Priority Sequence:
Primary station: PBX
Secondary station: VMS
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.