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Chapter 12 The Service Configuration Screens
User’s Guide
160
6
After talking, A hangs up and sends a BYE request.
7
B replies with an OK response confirming receipt of the BYE request and the call is
terminated.
12.4.2 SIP Client Server
SIP is a client-server protocol. A SIP client is an application program or device that
sends SIP requests. A SIP server responds to the SIP requests.
When you use SIP to make a VoIP call, it originates at a client and terminates at a
server. A SIP client could be a computer or a SIP phone. One device can act as
both a SIP client and a SIP server.
12.4.3 SIP User Agent
A SIP user agent can make and receive VoIP telephone calls. This means that SIP
can be used for peer-to-peer communications even though it is a client-server
protocol. In the following figure, either A or B can act as a SIP user agent client to
initiate a call. A and B can also both act as a SIP user agent to receive the call.
Figure 73
SIP User Agent
12.4.4 SIP Proxy Server
A SIP proxy server receives requests from clients and forwards them to another
server.
In the following example, you want to use client device A to call someone who is
using client device C.
1
The client device (A in the figure) sends a call invitation to the SIP proxy server
(B).
A
B
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Страница 2: ......
Страница 8: ...Safety Warnings User s Guide 8...
Страница 10: ...Contents Overview User s Guide 10...
Страница 30: ...30...
Страница 36: ...Chapter 1 Getting Started User s Guide 36...
Страница 46: ...Chapter 2 Introducing the Web Configurator User s Guide 46...
Страница 64: ...Chapter 4 VoIP Connection Wizard User s Guide 64...
Страница 65: ...65 PART II Basic Screens The Main Screen 40 The Setup Screens 67...
Страница 66: ...66...
Страница 74: ...74...
Страница 88: ...Chapter 6 The LAN Configuration Screens User s Guide 88...
Страница 112: ...Chapter 8 The Wi Fi Configuration Screens User s Guide 112...
Страница 134: ...Chapter 10 The NAT Configuration Screens User s Guide 134...
Страница 145: ...145 PART IV Voice Screens The Service Configuration Screens 147 The Phone Screens 165 The Phone Book Screens 175...
Страница 146: ...146...
Страница 164: ...Chapter 12 The Service Configuration Screens User s Guide 164...
Страница 180: ...Chapter 14 The Phone Book Screens User s Guide 180...
Страница 182: ...182...
Страница 202: ...Chapter 15 The Certificates Screens User s Guide 202...
Страница 212: ...Chapter 16 The Firewall Screens User s Guide 212...
Страница 226: ...Chapter 18 The Remote Management Screens User s Guide 226...
Страница 242: ...Chapter 19 The Logs Screens User s Guide 242...
Страница 252: ...Chapter 20 The UPnP Screen User s Guide 252...
Страница 265: ...265 PART VI Troubleshooting and Specifications Troubleshooting 267 Product Specifications 275...
Страница 266: ...266...
Страница 274: ...Chapter 22 Troubleshooting User s Guide 274...
Страница 278: ...278...
Страница 310: ...Appendix B Setting Up Your Computer s IP Address User s Guide 310...
Страница 336: ...Appendix D Pop up Windows JavaScripts and Java Permissions User s Guide 336...
Страница 380: ...Appendix F Importing Certificates User s Guide 380...
Страница 382: ...Appendix G SIP Passthrough User s Guide 382...
Страница 398: ...Appendix J Customer Support User s Guide 398...
Страница 405: ...Index User s Guide 405...