Specifications
Table Of Contents
- Software Configuration Guide
- Contents
- Preface
- Understanding Interface Numbering and Cisco IOS Software Basics
- Understanding Interface Numbering
- Understanding Cisco IOS Software Basics
- Upgrading to a New Cisco IOS Release
- Where to Go Next
- Using the Setup Command Facility
- Before Starting Your Router
- Using the setup Command Facility
- Configuring Global Parameters
- Configuring Interface Parameters
- Completing the Configuration
- Where to Go Next
- Configuring with the Command-Line Interface
- Configuring the Host Name and Password
- Configuring 1-Port and 2-Port Ethernet Interfaces
- Configuring Fast Ethernet Interfaces
- Configuring Asynchronous/Synchronous Serial Network Modules or WAN Interface Cards
- Configuring 16-Port and 32-Port Asynchronous Network Modules
- Configuring ISDN BRI WAN Interface Cards
- Configuring T1 and E1 Interfaces
- Configuring T1 (FT1) WAN Interface Cards
- Configuring ATM Interfaces
- Configuring Inverse Multiplexing for ATM Interfaces
- Configuring Analog Modem Interfaces
- Configuring Wireless Multipoint Interfaces
- Checking the Interface Configuration
- Configuring 1-Port ADSL WAN Interface Card
- Configuring the NM-AIC-64, Contact Closure Network Module
- Configuring the 1-Port HSSI Network Module
- Configuring the Compression Network Module for the Cisco 3600 Series Routers
- Configuring the Digital Modem Network Module for the Cisco 3640 Router
- Prerequisites
- Configuration Tasks
- Configure the E1/T1 Network Module for ISDN PRI
- Configure the ISDN D-Channel Serial Interfaces
- Configure the Loopback Interface
- Configure the LAN Interface
- Create the Group Asynchronous Interface
- Configure the ISDN Dialer Interface
- Configure the Default IP Pool Information
- Configure Modem Lines for Dial-In and Dial-Out
- Configuration Example
- Configuring 1-Port G.SHDSL WAN Interface Card
- Saving Configuration Changes
- Where to Go Next
- Configuring Voice-over-IP
- Voice-over-IP Prerequisites
- Configuring the Voice Interface
- Voice-over-IP Configuration Examples
- Where to Go Next
- Configuration Examples
- Cisco 2600 Series Router Configuration Example
- Cisco 3631 Router Configuration Example
- Cisco 3725 Router Configuration Example
- 1-Port ADSL WAN Interface Card Configuration Examples
- NM-AIC-64, Contact Closure NetworkConfiguration Examples
- Cisco 3640 Central Site Configuration to Support ISDN and Modem Calls
- Formatting the Compact Flash Memory Cards
- Using the ROM Monitor
- Index
CHAPTER
4-1
Software Configuration Guide for Cisco 2600 Series, Cisco 3600 Series, and Cisco 3700 Series Routers
OL-1957-03
4
Configuring Voice-over-IP
This chapter explains how to configure voice network modules with receive and transmit (E&M),
Foreign Exchange Office (FXO), and Foreign Exchange Station (FXS) interfaces for your router. Voice
network modules convert telephone voice signals into a form that can be transmitted over an IP network.
This chapter is divided into the following sections:
• Voice-over-IP Prerequisites, page 4-1
• Configuring the Voice Interface, page 4-2
• Voice-over-IP Configuration Examples, page 4-3
• Where to Go Next, page 4-12
You need both a voice network module and a voice interface card for a voice connection. You can install
one voice interface card in a 2-channel voice network module, and two voice interface cards in a
4-channel module. At least one other network module or WAN interface card must be installed in the
router to provide the connection to the IP LAN or WAN.
Voice over IP (VoIP) enables your router to carry live voice traffic (for example, telephone calls and
faxes) over an IP network. VoIP offers the following benefits:
• Toll bypass
• Remote PBX presence over WANs
• Unified voice/data trunking
• Plain old telephone service (POTS)-Internet telephony gateways
Voice-over-IP Prerequisites
Before you can configure your router to use VoIP, you must first do the following:
• Establish a working IP network. For more information about configuring IP, refer to the
“Configuring IP” chapter in the Cisco IOS Release 11.3 Release Network Protocols Configuration
Guide, Part 1.
• Install the voice network module into your router. For more informationabout the voice network
modules, refer to the “Connecting Voice Network Modules to a Network” chapter in the Cisco
Network Modules Hardware Installation Guide.
• Complete your company’s dial plan. That is, decide what patterns of dialed numbers will access
what telephony endpoints.
• Establish a working telephony network based on your company’s dial plan.
• Integrate your dial plan and telephony network into your existing IP network topology.