Home » ZyXEL Manuals » Networking » ZyXEL P-2024 » Manual Viewer

ZyXEL P-2024 User Guide - Page 68

RTP, 6.1.7 NAT and SIP

Get ZyXEL P-2024 PDF manuals and user guides

View all ZyXEL P-2024 manuals

Add to My Manuals
Save this manual to your list of manuals

Page 68 highlights

Chapter 6 SIP Figure 25 SIP Redirect Server 6.1.5.4 SIP Register Server A SIP register server maintains a database of SIP identity-to-IP address (or domain name) mapping. The register server checks your user name and password when you register. 6.1.6 RTP When you make a VoIP call using SIP, the RTP (Real time Transport Protocol) is used to handle voice data transfer. See RFC 1889 for details on RTP. 6.1.7 NAT and SIP The P-2024 must register its public IP address with a SIP register server. If there is a NAT router between the P-2024 and the SIP register server, the P-2024 probably has a private IP address. The P-2024 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 P-2024's IP address from inside the SIP message and maps it to your SIP identity. If the P2024 has a private IP address listed in the SIP message, the SIP server cannot map it to your SIP identity. Use a SIP ALG (Application Layer Gateway), Use NAT, STUN, or outbound proxy to allow the P-2024 to list its public IP address in the SIP messages. 6.1.7.1 SIP ALG Some applications, such as SIP, cannot operate through NAT (are NAT un-friendly) because they embed IP addresses and port numbers in their packets' data payload. 68 P-2024 User's Guide

Section	Page
User’s Guide	1
About This User's Guide	3
Document Conventions	4
Safety Warnings	6
Contents Overview	9
Table of Contents	11
List of Figures	17
List of Tables	21
Introduction and Wizard	25
Introducing the P-2024	27
1.1 Overview	27
1.2 Ways to Manage the P-2024	27
1.3 Good Habits for Managing the P-2024	28
1.4 Hardware	28
1.4.1 Ports	29
1.4.2 LEDs	29
1.4.3 Console Port	29
1.4.4 Digital Signal Processor Modules	30
1.5 Resetting the P-2024	31
Introducing the Web Configurator	33
2.1 Web Configurator Overview	33
2.2 Accessing the Web Configurator	33
2.3 Web Configurator Main Screen	35
2.3.1 Title Bar	35
2.3.2 Navigation Panel	36
2.3.3 Main Window	37
2.3.4 Status Bar	37
The Connection Wizard	39
3.1 Main Wizard Screen	39
3.1.1 Welcome	40
3.1.2 System Information	40
3.1.3 ISP Parameters	41
3.1.4 Your IP Address	43
3.1.5 WAN IP Address Assignment	43
3.1.6 Finish	46
Status Screens	47
4.1 Status Screen	47
4.2 Packet Statistics Window	50
4.3 VoIP Statistics Window	51
Network	55
WAN	57
5.1 WAN Overview	57
5.1.1 PPPoE Encapsulation	57
5.1.2 WAN IP Address Assignment	57
5.1.3 DNS Server Address Assignment	58
5.2 WAN Screens	58
5.2.1 WAN Internet Connection Screen (Ethernet)	58
5.2.2 WAN Internet Connection Screen (PPPoE)	59
5.2.3 WAN Advanced Screen	61
VoIP	63
SIP	65
6.1 SIP Overview	65
6.1.1 Introduction to VoIP	65
6.1.2 Introduction to SIP	65
6.1.3 SIP Identities	65
6.1.4 SIP Call Progression	66
6.1.5 SIP Client Server	66
6.1.6 RTP	68
6.1.7 NAT and SIP	68
6.1.8 Voice Coding	70
6.1.9 PSTN Call Setup Signaling	70
6.1.10 MWI (Message Waiting Indication)	71
6.1.11 Quality of Service (QoS)	71
6.2 SIP Screens	72
6.2.1 SIP Settings Screen	72
6.2.2 Advanced SIP Setup Screen	73
6.2.3 SIP QoS Screen	77
Phone	79
7.1 Analog Phone Overview	79
7.1.1 Voice Activity Detection/Silence Suppression/Comfort Noise	79
7.1.2 Echo Cancellation	79
7.1.3 Supplementary Phone Services Overview	79
7.2 Phone Screens	82
7.2.1 Analog Phone Screen	82
7.2.2 Advanced Analog Phone Setup Screen	83
7.2.3 Common Phone Settings Screen	84
7.2.4 Phone Region Screen	85
Phone Book	87
8.1 Incoming Call Policy Screen	87
Management	91
Remote Management	93
9.1 Remote Management Overview	93
9.1.1 Remote Management Limitations	93
9.1.2 System Timeout	94
9.2 Remote Management Screens	94
9.2.1 WWW Screen	94
9.2.2 Telnet Screen	94
9.2.3 FTP Screen	95
9.3 SNMP	96
9.3.1 Supported MIBs	97
9.3.2 SNMP Traps	97
9.3.3 Configuring SNMP	97
Maintenance, Troubleshooting and Specifications	99
System	101
10.1 General System Screen	101
10.2 Dynamic DNS	102
10.2.1 Dynamic DNS Screen	102
10.3 Time Setting Overview	104
10.3.1 Pre-defined NTP Time Servers List	104
10.3.2 Synchronizing with a Time Server	105
10.3.3 Time Settings Screen	105
Logs	107
11.1 Logs Overview	107
11.1.1 Alerts	107
11.1.2 Syslog Logs	107
11.2 Logs Screens	108
11.2.1 View Log Screen	108
11.2.2 Log Settings Screen	108
11.3 Log Message Descriptions	110
Tools	115
12.1 Firmware Screen	115
12.1.1 Firmware Upload Screens	116
12.2 Configuration Screen	117
12.2.1 Restore Configuration Screens	118
12.3 Restart Screen	119
Troubleshooting	121
13.1 Power, Hardware Connections, and LEDs	121
13.2 P-2024 Access and Login	122
13.3 Internet Access	123
13.4 Phone Calls and VoIP	124
Product Specifications	129
14.1 General P-2024 Specifications	129
14.2 Telco-50 Connector Pin Assignments	131
14.2.1 P-2024 Phone Port Pin Assignments	131
14.2.2 Telco-50 Cable Connector Pin Assignments	131
14.3 Console Port Pin Assignments	132
Appendices and Index	133
Setting up Your Computer’s IP Address	135
Pop-up Windows, JavaScripts and Java Permissions	151
Rack-mount Installation	157
IP Addresses and Subnetting	159
Command Interpreter	169
NetBIOS Filter Commands	173
Internal SPTGEN	175
Legal Information	191
Customer Support	195

Match case Limit results 1 per page

Chapter 6 SIP

P-2024 User’s Guide

Figure 25

SIP Redirect Server

6.1.5.4

SIP Register Server

A SIP register server maintains a database of SIP identity-to-IP address (or domain name)

mapping. The register server checks your user name and password when you register.

6.1.6

RTP

When you make a VoIP call using SIP, the RTP (Real time Transport Protocol) is used to

handle voice data transfer. See RFC 1889 for details on RTP.

6.1.7

NAT and SIP

The P-2024 must register its public IP address with a SIP register server. If there is a NAT

router between the P-2024 and the SIP register server, the P-2024 probably has a private IP

address. The P-2024 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 P-2024’s IP address from inside the SIP message and maps it to your SIP identity. If the P-

2024 has a private IP address listed in the SIP message, the SIP server cannot map it to your

SIP identity.

Use a SIP ALG (Application Layer Gateway), Use NAT, STUN, or outbound proxy to allow

the P-2024 to list its public IP address in the SIP messages.

6.1.7.1

SIP ALG

Some applications, such as SIP, cannot operate through NAT (are NAT un-friendly) because

they embed IP addresses and port numbers in their packets’ data payload.