Toshiba VP 300, Installation Instructions Manual

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CENTREX SMDI OPERATION
SMDI stands for Simplified Message Desk Interface and, SMSI stands for Simplified Message Service
Interface.
1 These are optional services available on some Centrex systems. They provide a connection
between Centrex and the VP 300 on the customer's premise. This connection is in the form of a 1200 baud
serial data link.
Calls to unanswered or busy Centrex lines are forwarded via Centrex call forwarding to the VP 300 multi-
line hunt group. The SMDI/SMSI feature provides the VP 300 with the number of the forwarded Centrex
line and the condition upon which it was forwarded.
The Centrex must be equipped with Simplified Message Desk Interface (SMDI) or Simplified Message
Service Interface (SMSI) for MWI and CPI to operate.
This chapter refers to SMDI, but also applies to SMSI.
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As of this publication date, SMDI is available on the AT&T 1AESS, the Northern Telecom SL-100,
and the Northern Telecom DMS 100 central office (CO) switches. SMSI is available on the AT&T
5ESS. Even if the switch is a 1AESS, 5ESS, SL-100 or DMS 100, SMDI or SMSI may not be
available at a particular location. Inquire with the RBOC to see if SMDI/SMSI is available and at what
cost. The RBOC may require the stations associated with the SMDI/SMSI link (the VP 300 ports) to
be in a UCD group. In addition, there is an installation charge associated with the UCD feature and a
one-time charge associated with each station in a UCD group. There is also a small monthly charge for
the UCD.
Fujitsu Focus 9600 PBXs also use the SMDI protocol.
Intercom IBX and Telari PBXs use a protocol similar to SMDI. Since these PBXs send call records
with ASCII periods (.) preceding the station number, use the PREFIX DIGITS Table to remove the
leading ASCII periods.
1 As stated in the Bell Communications Research Technical Reference TR-TSY-000283: "The word simplified as used to
describe this feature, does not imply that there is an alternate feature that is more complex or comprehensive. It is only
used to emphasize the simplicity of the design."
Toshiba VP Systems Release 6.1 February, 1993
CENTREX ADAPTIVE INTEGRATION 9-1
9.1