NAT and SIP, Sip Alg | ZyXEL Communications P2000W specs

P-2000W_V2 User’s Guide

Figure 25 Symmetric NAT

12.12 NAT and SIP

Some NAT routers are not SIP-friendly and will stop your voice sessions.

The Prestige must register its public IP address with a SIP register server. If there is a NAT router between the Prestige and the SIP register server, the Prestige probably has a private IP address. The Prestige lists its IP address in the SIP message that it sends to the SIP register server. NAT does not translate this IP address in the SIP message. The SIP register server gets the Prestige’s IP address from inside the SIP message and maps it to your SIP identity. If the Prestige has a private IP address listed in the SIP message, the SIP server cannot map it to your SIP identity.

A SIP ALG (Application Layer Gateway), the fake WAN address on SIP and RTP, STUN, or outbound proxy features allow the Prestige to use its public IP address in the SIP messages.

12.12.1 SIP ALG

Some NAT routers may include a SIP Application Layer Gateway (ALG). A SIP ALG allows SIP calls to pass through NAT by examining and translating IP addresses embedded in the data stream. When the Prestige registers with the SIP register server, the SIP ALG translates the Prestige’s private IP address inside the SIP data stream to a public IP address. You do not need to use STUN or an outbound proxy if your Prestige is behind a SIP ALG.

12.12.2 Fake WAN Address on SIP and RTP

If you know the NAT router’s public IP address and SIP port number, you can use the fake WAN address on SIP and RTP feature to manually configure the Prestige to use a them in the SIP messages. This eliminates the need for STUN or a SIP ALG.

You must also configure the NAT router to forward traffic with the SIP port number to the Prestige.

88	Chapter 12 User Web Configurator Screens
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ZyXEL Communications P2000W manual NAT and SIP, Sip Alg, Fake WAN Address on SIP and RTP

Contents

2000WV2 Page Copyright DisclaimerTrademarks 2000WV2 User’s Guide Certifications Sales@voipon.co.uk Tel +44 01245 Fax +44 01245 2000WV2 User’s Guide Safety Warnings Safety Warnings ZyXEL Limited Warranty Customer Support Customer Support United Kingdom Page Table of Contents Chapter Network Settings 10.1 Appendix a Appendix C Page List of Figures List of Figures Prestige as a PPPoE Client List of Tables List of Tables Preface About Your PrestigeRelated Documentation Syntax Conventions Graphics Icons Key Preface Features QoS Quality of ServiceGetting To Know Your Prestige Dynamic Jitter Buffer Applications Place a Call via SIP Proxy Server SIP Call Server Ad-Hoc Wireless Intercom Direct IP to IP Calling Getting to Know the Prestige Hardware Prestige Hardware Descriptions 2000WV2 User’s Guide Prestige Hardware Descriptions Page Using the LCD Screen Menus LCD Main Screen Using the LCD Screen Menus Navigating the LCD Screen MenusText Input 2000WV2 User’s Guide LCD Main Screen Press the OK key when you are done Page Wireless LAN Setup Menus Wireless LAN Setup Menus Tel +44 01245 808195 Fax +44 01245Site Survey Select Site Survey Network Mode Select Wireless in the first menu screen use the up or downWireless LAN Setup Menus Ssid Select Network Mode Channel Rate WEP Encryption Authentication Type Select Key Select Profiles Create Page Fixed IP Network SettingsSelect IP Address Dhcp Network SettingsSelect Subnet Mask PPPoE Select PPPoE Name Clear the PPPoE password and enter your’s Select PPPoE Pwd Registrar Server SIP SettingsSelect Registrar Select Registrar IP Outbound Proxy Server SIP SettingsSelect Outbound Proxy Proxy Server Select Proxy Server User Account Select User Account Select Phone Number Username Page Phonebook Calling MethodsAdding a Phonebook Entry Select Phonebook in the first menu Editing Phonebook Entries Phonebook Erasing Phonebook Entries Speed Dial Phonebook Entries Select Speed Dial Call History Missed Calls Received Calls Call History Dialed Calls Erasing Calls Select Erase Calls Setting the Ring Melody Miscellaneous SettingsMiscellaneous Settings Tel +44 01245 808195 Fax +44 01245 Setting the Vibration Mode Adjusting the Ring VolumeSelect Ringer Volume Miscellaneous Settings Setting the Time Setting the DateSelect Edit Time Select Edit Date Setting the Banner Setting the Key LockSelect Settings in the first menu screen Press the Left key to save your setting Setting the Don’t Disturb Select Don’t DisturbPage Information Menus Displaying Information Select Firmware Ver Information Menus Using the Phonebook to Dial a Telephone Number Using Speed Dial to Dial a Telephone NumberPrestige Usage Dialing a Telephone Number Changing the Volume Answering a CallRejecting a Call Prestige Usage Using the Web Configurator Screens Introduction to the Web ConfiguratorLogin Accounts Navigating the Prestige Web Configurator Using the Web Configurator Screens Web Configurator User Screens Summary Web Configurator Administrator Screens SummaryPage User Web Configurator Screens Device InformationIP Address Assignment Private IP Address Ranges IP Address and Subnet Mask User Web Configurator ScreensMAC Address Network Configuration Static DNS Server Cancel Network Configuration DhcpApply Dhcp Network Configuration PPPoE PPPoE Network Configuration VoIP Introduction 12.9.1 SIPSIP Identities PPPoE SIP Call Progression SIP Client ServerSIP Call Progression Invite SIP Proxy Server SIP Configuration 12.9.1.4 RTP 12.11 NAT SIP Proxy NAT Example NAT Types Full Cone NAT NAT Types Restricted Cone NAT Full Cone NAT Example Port Restricted Cone NAT Symmetric NAT SIP ALG NAT and SIPFake WAN Address on SIP and RTP Stun NAT Traversal ConfigurationOutbound Proxy NAT Traversal Configuration ALG Phonebook Configuration PhonebookCalling Methods Stun Edit DeleteClear Wireless Settings Wireless IntroductionWEP Encryption Ssid WEP System 12.19 S/W UpdateSubmit W Update Zip files before you can upload them Administrator Web Configurator Screens SIP Proxy Configuration Administrator Web Configurator Screens SIP Configuration SIP URI Voice Coding 2000WV2 User’s Guide SIP Configuration13.3.1 G.711 Phone Setting Pstn Call Setup Signaling13.3.2 G.729 Same codec as the Prestige Quality of Service System Settings 13.8 ToS Introduction to DiffServ Troubleshooting Problems Starting Up the PrestigeProblems Using the Keypad Troubleshooting the Start-Up of Your Prestige Problems Accessing the Prestige Troubleshooting Accessing the Prestige Error Message Troubleshooting Restoring the Factory Default SettingsError Message Troubleshooting DhcpPage Hardware Specifications Specification TablesMIC HTTP, TFTP, TCP, UDP, DNS, ARP, Icmp 2000WV2 User’s Guide Firmware FeaturesEssid IP Classes IP AddressingClasses of IP Addresses Subnet Masks SubnettingAllowed IP Address Range By Class Natural Masks Alternative Subnet Mask Notation Example Two SubnetsTwo Subnets Example Subnet Example Four Subnets Eight Subnets Example Eight SubnetsClass C Subnet Planning Subnetting With Class a and Class B Networks Class B Subnet PlanningPage Benefits of PPPoE PPPoE in ActionTraditional Dial-up Scenario How PPPoE Works Prestige as a PPPoE Client Wireless LAN Topologies Ad-hoc Wireless LAN Configuration ESS Roaming Infrastructure Wlan Requirements for Roaming Roaming Example 2000WV2 User’s Guide Page Index Numerics 711 24, 100 729 24, 101 IP-PBX PCM 100 130 Index Sales@voipon.co.uk Tel +44 01245 Fax +44 01245 Wlan