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Cisco 1751 Voice-over-IP Quick Start Guide

78-11259-04

Configuring Voice-over-IP

You can use a period (.) as a wildcard character representing a single digit in a telephone number.

You can use the show num-exp command to verify the number expansion information.

East# show num-exp [dialed-number]

After you have configured dial peers and assigned destination patterns to them, you can use the show

dialplan number command to see how a telephone number maps to a dial peer.

East# show dialplan number [dialed-number]

Note You must still configure each telephone number in full on a local dial peer so that the router can find the

voice port it belongs to.

Configuring FXS Interfaces

This section explains how to configure ports on FXS VICs that connect directly to a standard telephone,

fax machine, or similar device.

Figure 11 shows a basic voice network. A small business uses a Cisco 1751 router (named West) to

provide telephone and fax connections among employees in its office. Two of these telephones are

connected to an FXS VIC port in the West router.

Figure 11 Basic Voice Network (West Router)

Table 5 Sample Number Expansion Table

Extension

Destination

Pattern Num-Exp Command Entry Description

3737 14085553737 num-exp 3737 14085553737 To expand 3737 to 14085553737

.... 1408555.... num-exp .... 1408555.... To expand any dialed sequence

of four digits (represented by

four periods) by prefixing

1408555 to it

5.... 1408555.... num-exp 5.... 1408555.... To expand a five-digit extension

beginning with the numeral 5 by

prefixing 140855 to it

408 555-3737

408 555-4141

FXS VIC

0/0

FXS VIC

0/1

West

IP cloud

22634

1 2 ... 10 11 12 13 14 15 16 17 18 19 20 ... 33 34

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Cisco 1751 Guide d'installation Page 15