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RS-232C Integrations
RS-232C integrations are similar to the Bell Operating Company’s (BOC) Simplified Message
Desk Interface (SMDI) and those that are similar to it. The SMDI or RS-232C interface provides
the directory number, or PBX extension number of the called extension from which an incoming
call was forwarded, to the message desk. If the call originated in the same CO or PBX, the
directory number or extension number is sent to the message desk.
The condition or reason the call was forwarded to the message desk, as well as the port or member
of the hunt group the call is being sent to, is included in the protocol. Message waiting indication
may be turned ON or OFF over RS-232C connections for most installations.
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Toshiba Proprietary Card Integrations
Toshiba has a proprietary line card that functions similarly to digital display telephones for the
Mitel PBXs. The Toshiba VP System and the proprietary line card are used to determine the
station identity and the condition for the call, and then answer the call with the appropriate
greeting or response.
Once the station identity and condition for the forwarded call is known, an analog port answers
the call and provides all remaining messaging functions. The proprietary line card is used to turn
ON or OFF message waiting indicators.
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Answering Incoming Calls
The VP 300 can answer all or a portion of a company’s incoming calls. Trunks can be directed to the
VP 300 hunt group instead of the operator through a PBX feature. This feature, often called DIL
(Direct In Lines), allows trunks to be directed to a specific extension or hunt group instead of the
console.
The PBX may be set up to direct all or only some incoming trunks to the VP 300. For example, the
main company number may go to the attendant, while a second trunk group, with a different listed
directory number, can be directed to the VP 300. Ports answering incoming calls are configured in
AX mode.
Figure 2-1 is a block diagram of the VP 300 connected to the phone system where all incoming lines
are directed to it. Arrows denote hunting.
VP 300
PBX
Figure 2-1 All Incoming Calls Answered by the VP 300
Toshiba VP Systems Release 6.1 February, 1993
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