Avaya BCM 2.0 IP Telephony Instrukcja Użytkownika Pobierz pdf (Strona 15)

P0911590 Issue 02 Enterprise Edge 2.0 IP Telephony Configuration Guide

Engineering guidelines

The engineering guidelines address the design of an IP trunk network for Enterprise

Edge VoIP Gateway. The network contains the following:

• Enterprise Edge VoIP gateways

• Gateways attached to LANs

• Corporate intranet connecting the LANs

The guidelines assume that an installed corporate intranet connects the sites of the

IP gateways.

Introduction

IP telephony compresses PCM voice and routes the packetized data over an

intranet, to provide virtual analog TIE trunks between gateways. As voice traffic

flows through at low marginal cost over existing private IP network facilities with

available bandwidth on the private Wide Area Network (WAN) backbone,

communication costs are lower.

This chapter provides guidelines for correctly designing a network of IP gateways

over the corporate intranet. The chapter describes how to qualify the corporate

intranet to support an IP network. This chapter indicates which changes ensure the

maintenance of the quality of voice services when transferring those services from

the PSTN. This chapter also addresses requirements for the successful integration

with a customer's existing local area network (LAN). By following these guidelines

the installer can configure the IP to ensure the best cost and quality and within a

calculated tolerance.

Enterprise Edge IP telephony

Enterprise Edge IP telephony functions on a correctly provisioned and stable LAN.

Delay, delay variation or jitter, and packet loss must be minimized end-to-end

across the LAN and WAN. The installer must determine the design and

configuration of the LAN and WAN that link the IP telephony system. If the

intranet exceeds it’s capacity, new calls to the IP telephony fall back to conventional

circuit-switched voice facilities to ensure the quality of service for new calls.

Overview

Traditional networks depend on voice services such as LEC and IXC private lines.

With Enterprise Edge IP telephony technology, IP telephony selects a new kind of

delivery mechanism that uses packet switching over a data network, a corporate

intranet. The IP gateway converts a steady-stream digital voice into fixed length IP

packets.

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Avaya BCM 2.0 IP Telephony Instrukcja Użytkownika Strona 15