15
Cisco 1751 Voice-over-IP Quick Start Guide
78-11259-05
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
