Specifications

Network Configuration Concepts
193
Introduction
This chapter provides a high-level overview of the network settings and configurations required
for a Voice-over-IP (VoIP) installation with the 3300 ICP when used in a business or Enterprise
environment. The concepts below will help you understand more about network configurations.
Table 61 shows a list of the topics in this chapter and a description of what you will find in each
one.
Table 61: Network Concepts
Section Topics
“Network Configuration Guidelines” on
page 194
Guidelines for network configuration with links to the pertinent
sections.
“Voice-Over-IP Installation Requirements”
on page 197
General installation considerations, such as quality of service,
switched networks, network topology, network address
translations and firewalls.
“General Guidelines for Quality of Service”
on page 199
Delay, echo, jitter, packet loss, available bandwidth, priority
mechanisms, WAN connections, transcoding and compression,
hub network vs. switched network, LAN architecture.
“Maintaining Voice Quality of Service” on
page 205
Discusses the following topics:
“VoIP Readiness Assessment” on page 205
“Network Measurement Criteria” on page 206
“Bandwidth Requirements” on page 206
“Voice quality and codec selection” on page 181
“Bandwidth availability” on page 171
“Serialization Delay” on page 207
“Network Priority Mechanisms” on page 209
“Full Duplex and Half Duplex Settings” on page 218
“Maintaining Availability of Connections” on
page 220
Discusses the following topics:
• “Traffic and Bandwidth Calculations” on page 220
• “IP networking and Use of Compression” on page 222
• “Firewalls and NAT” on page 225