Chapter 16 VoIP
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Registration is initiated by the User Agent Client (UAC) running in the VoIP
gateway (the ZyXEL Device). The gateway must be configured with information
letting it know where to send the REGISTER message, as well as the relevant user
and authorization data.
A SIP registration has a limited lifespan. The User Agent Client must renew its
registration within this lifespan. If it does not do so, the registration data will be
deleted from the SIP registrar's database and the connection broken.
The ZyXEL Device attempts to register all enabled subscriber ports when it is
switched on. When you enable a subscriber port that was previously disabled, the
ZyXEL Device attempts to register the port immediately.
Authorization Requirements
SIP registrations (and subsequent SIP requests) require a username and
password for authorization. These credentials are validated via a challenge /
response system using the HTTP digest mechanism (as detailed in RFC3261, "SIP:
Session Initiation Protocol").
SIP Servers
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.
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 90
SIP User Agent
A
B
Summary of Contents for P-2601HN(L)-F1 Series
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Page 8: ...Safety Warnings P 2601HN L F1 Series User s Guide 8 ...
Page 10: ...Contents Overview P 2601HN L F1 Series User s Guide 10 ...
Page 19: ...19 PART I User s Guide ...
Page 20: ...20 ...
Page 59: ...59 PART II Technical Reference ...
Page 60: ...60 ...
Page 110: ...Chapter 6 Wireless P 2601HN L F1 Series User s Guide 110 ...
Page 130: ...Chapter 8 Routing P 2601HN L F1 Series User s Guide 130 ...
Page 134: ...Chapter 9 DNS Route P 2601HN L F1 Series User s Guide 134 ...
Page 178: ...Chapter 16 VoIP P 2601HN L F1 Series User s Guide 178 Figure 81 VoIP SIP SIP Service Provider ...
Page 202: ...Chapter 16 VoIP P 2601HN L F1 Series User s Guide 202 ...
Page 206: ...Chapter 17 Logs P 2601HN L F1 Series User s Guide 206 ...
Page 212: ...Chapter 18 System Monitor P 2601HN L F1 Series User s Guide 212 ...
Page 220: ...Chapter 21 SNMP P 2601HN L F1 Series User s Guide 220 ...
Page 232: ...Chapter 26 Backup Restore P 2601HN L F1 Series User s Guide 232 ...
Page 290: ...Appendix B Setting Up Your Computer s IP Address P 2601HN L F1 Series User s Guide 290 ...
Page 322: ...Appendix D Wireless LANs P 2601HN L F1 Series User s Guide 322 ...
Page 332: ...Appendix F Open Software Announcements P 2601HN L F1 Series User s Guide 332 ...
Page 344: ...Index P 2601HN L F1 Series User s Guide 344 ...