Specifications

AT-VP504E FXS 91

Telephony Configuration

This chapter explains how to set the telephony variables of the

AT-VP504E FXS, i.e. the way the unit handles calls.

Using Dial Maps A Dial Map is a very powerful feature that allows you to compare the

number users just dialed to a string of arguments. If they match, users

will be able to make the call. If not, users will not be able to make the

call and will get a busy signal. It is thus essential to define very

precisely a Dial Map before actually implementing it, or your users may

encounter calling problems.

Because the AT-VP504E FXS cannot predict how many digits it needs

to accumulate before transmission, you could use the Dial Map, for

instance, to determine exactly when there are sufficient digits entered

from the user to place a call.

For example, using the phone on your desk, you can dial the following

numbers:

The solution to this problem is to load the AT-VP504E FXS with a Dial

Map that corresponds to the dial plan. This Dial Map is expressed

using a specific syntax.

An AT-VP504E FXS that detects digits or timers applies the current

dial string to the Dial Map, attempting a match to each regular

expression in the Dial Map in lexical order.

If the result is under-qualified (partially matches at least

one entry in the Dial Map), waits for more digits.

If the result matches, dials the number.

Table 38: Number Examples

Number Description

0 Local operator

00 Long distance operator

xxxx Local extension number

8xxxxxxx Local number

#xxxxxxx Shortcut to local number at other corporate sites

91xxxxxxxxxx Long distance numbers

9011 + up to 15 digits International number