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SIP, 6.1 SIP Overview, 6.1.1 Introduction to VoIP, 6.1.3 SIP Identities

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Page 65 highlights

CHAPTER 6 SIP Use these screens to set up your SIP accounts and to configure QoS settings. 6.1 SIP Overview 6.1.1 Introduction to VoIP VoIP (Voice over IP) is the sending of voice signals over the Internet Protocol. This allows you to make phone calls and send faxes over the Internet at a fraction of the cost of using the traditional circuit-switched telephone network. You can also use servers to run telephone service applications like PBX services and voice mail. Internet Telephony Service Provider (ITSP) companies provide VoIP service. A company could alternatively set up an IP-PBX and provide it's own VoIP service. Circuit-switched telephone networks require 64 kilobits per second (kbps) in each direction to handle a telephone call. VoIP can use advanced voice coding techniques with compression to reduce the required bandwidth. 6.1.2 Introduction to SIP The Session Initiation Protocol (SIP) is an application-layer control (signaling) protocol that handles the setting up, altering and tearing down of voice and multimedia sessions over the Internet. SIP signaling is separate from the media for which it handles sessions. The media that is exchanged during the session can use a different path from that of the signaling. SIP handles telephone calls and can interface with traditional circuit-switched telephone networks. 6.1.3 SIP Identities A SIP account uses an identity (sometimes referred to as a SIP address). A complete SIP identity is called a SIP URI (Uniform Resource Identifier). A SIP account's URI identifies the SIP account in a way similar to the way an e-mail address identifies an e-mail account. The format of a SIP identity is SIP-Number@SIP-Service-Domain. 6.1.3.1 SIP Number The SIP number is the part of the SIP URI that comes before the "@" symbol. A SIP number can use letters like in an e-mail address ([email protected] for example) or numbers like a telephone number ([email protected] for example). P-2024 User's Guide 65

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

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P-2024 User’s Guide

HAPTER

SIP

Use these screens to set up your SIP accounts and to configure QoS settings.

6.1

SIP Overview

6.1.1

Introduction to VoIP

VoIP (Voice over IP) is the sending of voice signals over the Internet Protocol. This allows you

to make phone calls and send faxes over the Internet at a fraction of the cost of using the

traditional circuit-switched telephone network. You can also use servers to run telephone

service applications like PBX services and voice mail. Internet Telephony Service Provider

(ITSP) companies provide VoIP service. A company could alternatively set up an IP-PBX and

provide it’s own VoIP service.

Circuit-switched telephone networks require 64 kilobits per second (kbps) in each direction to

handle a telephone call. VoIP can use advanced voice coding techniques with compression to

reduce the required bandwidth.

6.1.2

Introduction to SIP

The Session Initiation Protocol (SIP) is an application-layer control (signaling) protocol that

handles the setting up, altering and tearing down of voice and multimedia sessions over the

Internet.

SIP signaling is separate from the media for which it handles sessions. The media that is

exchanged during the session can use a different path from that of the signaling. SIP handles

telephone calls and can interface with traditional circuit-switched telephone networks.

6.1.3

SIP Identities

A SIP account uses an identity (sometimes referred to as a SIP address). A complete SIP

identity is called a SIP URI (Uniform Resource Identifier). A SIP account's URI identifies the

SIP account in a way similar to the way an e-mail address identifies an e-mail account. The

format of a SIP identity is SIP-Number@SIP-Service-Domain.

6.1.3.1

SIP Number

The SIP number is the part of the SIP URI that comes before the “@” symbol. A SIP number

can use letters like in an e-mail address ([email protected] for example) or numbers

like a telephone number ([email protected] for example).