Chapter 9 SIP
P-2304R-P1 Series User’s Guide
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9.1.3.2 SIP Service Domain
The SIP service domain of the VoIP service provider (the company that lets you make phone
calls over the Internet) is the domain name in a SIP URI. For example, if the SIP address is
, then “VoIP-provider.com” is the SIP service domain.
9.1.4 SIP Call Progression
The following figure displays the basic steps in the setup and tear down of a SIP call. A calls
B.
1
A sends a SIP INVITE request to B. This message is an invitation for B to participate in
a SIP telephone call.
2
B sends a response indicating that the telephone is ringing.
3
B sends an OK response after the call is answered.
4
A then sends an ACK message to acknowledge that B has answered the call.
5
Now A and B exchange voice media (talk).
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.
9.1.5 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.
9.1.5.1 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.
Table 46
SIP Call Progression
A
B
1. INVITE
2. Ringing
3. OK
4. ACK
5.Dialogue (voice traffic)
6. BYE
7. OK
Содержание P-2304R
Страница 1: ...www zyxel com P 2304R P1 Series VoIP Station Gateway User s Guide Version 3 60 10 2006 Edition 1...
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Страница 8: ...Contents Overview P 2304R P1 Series User s Guide 8...
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Страница 32: ...Chapter 1 Introducing the ZyXEL Device P 2304R P1 Series User s Guide 32...
Страница 40: ...Chapter 2 Introducing the Web Configurator P 2304R P1 Series User s Guide 40...
Страница 73: ...73 PART II Network WAN 75 LAN 85 NAT 97...
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Страница 105: ...105 PART III VoIP SIP 107 Phone 121 Phone Book 129...
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Страница 116: ...Chapter 9 SIP P 2304R P1 Series User s Guide 116 Figure 60 VoIP SIP SIP Settings Advanced...
Страница 128: ...Chapter 10 Phone P 2304R P1 Series User s Guide 128...
Страница 134: ...Chapter 11 Phone Book P 2304R P1 Series User s Guide 134...
Страница 135: ...135 PART IV Security and Management Firewall 137 Content Filter 145 Static Route 149 Bandwidth MGMT 153 Remote MGMT 165...
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Страница 144: ...Chapter 12 Firewall P 2304R P1 Series User s Guide 144...
Страница 148: ...Chapter 13 Content Filter P 2304R P1 Series User s Guide 148...
Страница 152: ...Chapter 14 Static Route P 2304R P1 Series User s Guide 152...
Страница 173: ...173 PART V Maintenance and Troubleshooting UPnP 175 System 187 Logs 195 Tools 209 Troubleshooting 215...
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Страница 186: ...Chapter 17 UPnP P 2304R P1 Series User s Guide 186...
Страница 194: ...Chapter 18 System P 2304R P1 Series User s Guide 194...
Страница 208: ...Chapter 19 Logs P 2304R P1 Series User s Guide 208...
Страница 220: ...Chapter 21 Troubleshooting P 2304R P1 Series User s Guide 220...
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Страница 228: ...Appendix A Product Specifications P 2304R P1 Series User s Guide 228...
Страница 258: ...Appendix E SIP Passthrough P 2304R P1 Series User s Guide 258...
Страница 290: ...Appendix I Legal Information P 2304R P1 Series User s Guide 290...