ZyXEL Communications P-2302HW-P1 Series, P-2302HWL-P1 Series NAT, SIP, Chapter, Chapter

P-2302HW/HWL-P1 Series User’s Guide

7.2.6 LAN Advanced Screen ............................................................................	127
Chapter 8
NAT ........................................................................................................................	131
8.1 NAT Overview .................................................................................................	131
8.1.1 Port Forwarding: Services and Port Numbers ........................................	131
8.1.2 Trigger Port Forwarding ..........................................................................	132
8.1.2.1 Trigger Port Forwarding Example .................................................	132
8.1.2.2 Two Points To Remember About Trigger Ports .............................	133
8.1.3 SIP ALG ..................................................................................................	133
8.2 NAT Screens ....................................................................................................	133
8.2.1 NAT General Screen ...............................................................................	133
8.2.2 NAT Port Forwarding Screen...................................................................	134
8.2.3 NAT Port Forwarding Edit Screen............................................................	136
8.2.4 NAT Trigger Port Screen..........................................................................	136
8.2.5 NAT ALG Screen .....................................................................................	138
Chapter 9
SIP .........................................................................................................................	139
9.1 SIP Overview ..................................................................................................	139
9.1.1 Introduction to VoIP ................................................................................	139
9.1.2 Introduction to SIP ..................................................................................	139
9.1.3 SIP Identities ...........................................................................................	139
9.1.3.1 SIP Number ...................................................................................	139
9.1.3.2 SIP Service Domain ......................................................................	140
9.1.4 SIP Call Progression ...............................................................................	140
9.1.5 SIP Client Server ....................................................................................	140
9.1.5.1 SIP User Agent .............................................................................	141
9.1.5.2 SIP Proxy Server ...........................................................................	141
9.1.5.3 SIP Redirect Server ......................................................................	142
9.1.5.4 SIP Register Server ......................................................................	142
9.1.6 RTP .........................................................................................................	142
9.1.7 NAT and SIP ...........................................................................................	143
9.1.7.1 SIP ALG ........................................................................................	143
9.1.7.2 Use NAT ........................................................................................	143
9.1.7.3 STUN ............................................................................................	143
9.1.7.4 Outbound Proxy ............................................................................	144
9.1.8 Voice Coding ...........................................................................................	144
9.1.9 PSTN Call Setup Signaling .....................................................................	144
9.1.10 MWI (Message Waiting Indication) .......................................................	145
9.1.11 Quality of Service (QoS) .......................................................................	145
9.1.11.1 Type of Service (ToS) ..................................................................	145
9.1.11.2 DiffServ ........................................................................................	145

18 Table of Contents