Cisco Systems CISCO1751 Configuring FXS Interfaces, Destination, Extension, Pattern, Description

Configuring Voice-over-IP

Table 5	Sample Number Expansion Table
		Destination
Extension		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

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

You can use the show num-expcommand 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)

408 555-3737

FXS VIC

0/0

IP cloud

	West
	FXS VIC
408 555-4141	0/1

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Cisco 1751 Voice-over-IP Quick Start Guide

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