ZyXEL Communications 2602H Series Chapter, Chapter, Chapter, Introduction to VoIP

Prestige 2602H/HW Series User’s Guide

Chapter 7
Network Address Translation (NAT) Screens....................................................		121
7.1	NAT Overview ..................................................................................................	121
	7.1.1 NAT Definitions .......................................................................................	121
	7.1.2 What NAT Does ......................................................................................	122
	7.1.3 How NAT Works .....................................................................................	122
	7.1.4 NAT Application ......................................................................................	123
	7.1.5 NAT Mapping Types ...............................................................................	123
7.2	SUA (Single User Account) Versus NAT ..........................................................	124
7.3	SUA Server ......................................................................................................	125
	7.3.1 Default Server IP Address ......................................................................	125
	7.3.2 Port Forwarding: Services and Port Numbers ........................................	125
	7.3.3 Configuring Servers Behind SUA (Example) ..........................................	126
7.4	Selecting the NAT Mode ..................................................................................	126
7.5	Configuring SUA Server ...................................................................................	127
7.6	Configuring Address Mapping ..........................................................................	129
7.7	Editing an Address Mapping Rule ....................................................................	130
Chapter 8
Introduction to VoIP .............................................................................................		133
8.1	Introduction to VoIP ..........................................................................................	133
8.2	SIP ..................................................................................................................	133
	8.2.1 SIP Identities ...........................................................................................	133
	8.2.1.1 SIP Number ...................................................................................	133
	8.2.1.2 SIP Service Domain ......................................................................	134
	8.2.2 SIP Call Progression ...............................................................................	134
	8.2.3 SIP Servers .............................................................................................	134
	8.2.3.1 SIP User Agent .............................................................................	135
	8.2.3.2 SIP Proxy Server ...........................................................................	135
	8.2.3.3 SIP Redirect Server ......................................................................	136
	8.2.3.4 SIP Register Server ......................................................................	137
	8.2.4 RTP .........................................................................................................	137
8.3	SIP ALG ...........................................................................................................	137
8.4	Pulse Code Modulation ....................................................................................	137
8.5	Voice Coding ....................................................................................................	138
	8.5.1 G.711 .......................................................................................................	138
	8.5.2 G.729 ......................................................................................................	138
8.6	PSTN Call Setup Signaling ..............................................................................	138
8.7	MWI (Message Waiting Indication) ...................................................................	138
Chapter 9
Voice Screens.......................................................................................................		139
9.1	Voice Screens Introduction ..............................................................................	139

14 Table of Contents