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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:
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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:
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Voice-over-IP Prerequisites
Before you can configure your router to use VoIP, you must first do the following:
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OL-1957-03
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
Toll bypass
Remote PBX presence over WANs
Unified voice/data trunking
Plain old telephone service (POTS)-Internet telephony gateways
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.
Software Configuration Guide for Cisco 2600 Series, Cisco 3600 Series, and Cisco 3700 Series Routers
C H A P T E R
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