Specifications

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Catalyst 4224 Access Gateway Switch Software Configuration Guide

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Chapter 6 Configuring VoIP

Configuration Tasks

To configure VoIP on your Catalyst 4224, perform the following steps:

Step 1 Configure your IP network to support real-time voice traffic. See the “Configure

IP Networks for Real-Time Voice Traffic” section on page 6-3 for information

about selecting and configuring the appropriate quality of service (QoS) tool or

tools to optimize voice traffic on your network.

Step 2 (Optional) If you plan to run Voice over Frame Relay, you need to consider

certain factors so that VoIP runs smoothly. For example, a public Frame Relay

cloud provides no guarantees for QoS. See the “Configure Frame Relay for VoIP”

section on page 6-37 for information about deploying VoIP over Frame Relay.

Step 3 Use the num-exp command to configure number expansion if your telephone

network is configured so that you can reach a destination by dialing only an

extension number of the full E.164 telephone number. See the “Configure

Number Expansion” section on page 6-12 for information about number

expansion.

Step 4 Use the dial-peer voice command to define dial peers and switch to the dial-peer

configuration mode. See the “Configure Dial Peers” section on page 6-15 and the

“Additional VoIP Dial-Peer Configurations” section on page 6-33 for additional

information about configuring dial peers and dial-peer characteristics.

Step 5 Configure your Catalyst 4224 to support voice ports. See the “Configure Voice

Ports” section on page 6-22 for information about configuring voice ports.

Configure IP Networks for Real-Time Voice Traffic

You need to have a well engineered end-to-end network when running

delay-sensitive applications such as VoIP. Fine-tuning your network to adequately

support VoIP involves a series of protocols and features to improve QoS. It is

beyond the scope of this document to explain the specific details relating to

wide-scale QoS deployment.

Cisco IOS software provides many tools for enabling QoS on your network

backbone. These tools include Random Early Detection (RED), Weighted

Random Early Detection (WRED), Fancy Queuing (meaning custom, priority, or