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VMMI Programming Exercises

Printed in the USA Page 17 GCA39-082 Rev 2, Issue 9/01

Exercise 9: DID Block Programming

Pre-Setup Discussion

In this exercise, you will:

• Create a DID Block Translation table.

• Test the table to see if translation takes place and the proper station rings.

DID is Direct Inward Dialing. You can dial inside a company directly without going through the

attendant. This feature used to be an exclusive feature of Centrex. It can now be provided by

virtually all modern PBXs and some modern hybrids, but you must connect via specially

configured DID lines from the local central office.

A DID trunk is a trunk from the CO that passes the last two to four digits of the listed directory

number to the telephone system. The phone system can use the digits verbatim, or modify them

through phone system programming to be the equivalent of an internal extension.

NOTE: DID is different from a DIL (Direct-In-Line) where a standard, both-way central office trunk is

programmed to always ring a specific extension of hunt group. DID lines cannot be used for outdial

operation, since there is no dialtone offered.

A DID rule of thumb is for every 10 numbers provided from the telephone company, a hardware

circuit is required (1 pair). For example if there were 50 numbers provided, than the telephone

company typically requires a minimum of 5 circuits. Most telephone companies reserve the right

to review the quality of service and require additional circuits be added.

This service is provided over T-1 circuits or a DID board. The following line drawing illustrates

the wiring required.

Telephone Compan

Twenty Numbers T

NNN-NN00 R

NNN-NN19 T

Comdial System with T-1

or DID board

1 2 ... 220 221 222 223 224 225 226 227 228 229 230 ... 251 252

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Comdial FX Series Especificaciones Pagina 225