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For complete information about the global configuration commands and about configuring LAN and

WAN interfaces on your router, refer to the Cisco IOS configuration guides and command references.

The rest of this guide explains how to configure your router for VoIP traffic.

Voice configuration uses a number of Cisco IOS commands. For complete information about these

Note

commands, refer to the Cisco 1751 Router Software Configuration Guide. You can also enter a question

mark after a command or partial command at the

help.

Note

At any point, you can see the operating configuration, including changes you just made, by entering the

show running-config command. To enter this command, you have to exit from configuration mode by

pressing Ctrl-Z or entering the end global configuration command.

Saving the Configuration

You must save the new configuration to nonvolatile RAM (NVRAM) periodically during the

configuration process and also when you finish configuring the router.

Cisco IOS software uses two configuration files—startup config and running config. The startup-config

file is a backup file that has all the information you specified about the router interfaces and is used by

the router on the next restart. The running-config file has the current operating configuration with the

changes you have just made. You can make any changes to the running-config file; however, these

changes will be lost when the router powers down. To make these changes permanent, copy the

running-config file to the startup-config file stored in NVRAM.

Follow these steps for each router to write the new configuration to NVRAM:

Step 1

Exit configuration mode, and return to the enable prompt by pressing Ctrl-Z or entering the end global

configuration command.

To see the startup configuration stored in NVRAM, enter the following command at the enable prompt:

Step 2

Router# show startup-config

Step 3

To see the operating configuration, including any changes you have just made, enter the following

command:

Router# show running-config

Step 4

To write your changes to NVRAM and make them permanent, enter the following command:

Router# copy running-config startup-config

Building configuration. . .

[OK]

Router#

The router is now configured to boot in the new configuration.

78-11259-05

prompt to get syntax and argument

Router(config)#

Cisco 1751 Voice-over-IP Quick Start Guide

Configuring Voice-over-IP