Cisco 3600 Series Manuale di configurazione

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Configuring Voice over IP for the

Cisco 3600 Series

This chapter shows you how to configure Voice over IP (VoIP) on the Cisco 3600 series. For a

description of the commands used to configure Voice over IP, refer to the "Voice-Related

Commands" chapter in the Voice, Video, and Home Applications Command Reference.

VoIP enables a Cisco 3600 series router to carry voice traffic (for example, telephone calls and faxes)

over an IP network. Voice over IP is primarily a software feature; however, to use this feature on a

Cisco 3600 series router, you must install a voice network module (VNM). The VNM can hold either

two or four voice interface cards (VICs), each of which is specific to a particular signaling type

associated with a voice port. For more information about the physical characteristics, installing or

configuring a VNM in your Cisco 3600 series router, refer to the Voice Network Module and Voice

Interface Card Configuration Note that came with your VNM.

Voice over IP offers the following benefits:

•

Toll bypass

•

Remote PBX presence over WANs

•

Unified voice/data trunking

•

POTS-Internet telephony gateways

How Voice over IP Processes a Telephone Call

Before configuring Voice over IP on your Cisco 3600 series router, it helps to understand what

happens at an application level when you place a call using Voice over IP. The general flow of a

two-party voice call using Voice over IP is as follows:

The user picks up the handset; this signals an off-hook condition to the signaling application part

of Voice over IP in the Cisco 3600 series router.

The session application part of Voice over IP issues a dial tone and waits for the user to dial a

telephone number.

The user dials the telephone number; those numbers are accumulated and stored by the session

application.

After enough digits are accumulated to match a configured destination pattern, the telephone

number is mapped to an IP host via the dial plan mapper. The IP host has a direct connection to

either the destination telephone number or a PBX that is responsible for completing the call to

the configured destination pattern.

Configuring Voice over IP for the Cisco 3600 Series VC-13