ZyXEL Communications P-2302HWL-P1 Series - Manual (Page 18)

P-2302HW/HWL-P1 Series User’s Guide
18 Table of Contents
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