Voice Over Internet Protocol (Voip) Implementation - ZyXEL Communications X2002 User Manual

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Table of Contents

Chapter 1 Introduction

Figure 1 IP PBX Example

The X2002 can function as a stand alone telephone switchboard for a small

organization. It can also supplement a legacy PBX within an organization by

providing VoIP telephony features.

1.1.1 Voice over Internet Protocol (VoIP) Implementation

The X2002 uses SIP (Session Initiation Protocol) to communicate with other SIP

devices. SIP is an internationally-recognized standard for implementing Voice over

Internet Protocol (VoIP).

The following figure shows SIP devices communicating with the X2002.

A: IP Phones - Telephones that convert voice into IP packets and vice versa (for

example ZyXEL's V-500).

B: Softphones - Software-based phones installed on PCs.

C: VoIP Gateways - Devices (for example ZyXEL's P-2302HWUDL) with built in

SIP processing which allow traditional analog phones or cordless phones to use

them as a link to the IP PBX.

D: ATAs - Analog Telephone Adapters (for example ZyXEL's P-2024) aggregate a

large number of analog phones and convert their signal into IP packets.

E: Peer IP PBXs - Other SIP based IP PBXs with which you communicate over an

IP network. This allows you to call the telephones connected to the peer IP PBX

without going through a telephone service provider.

X2002 User's Guide