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Chapter 16 VoIP
P-2601HN(L)-F1 Series User’s Guide
176
16.1.2 What You Need to Know
The following terms and concepts may help as you read this chapter.
VoIP
VoIP stands for Voice over IP. IP is the Internet Protocol, which is the message-
carrying standard the Internet runs on. So, Voice over IP is the sending of voice
signals (speech) over the Internet (or another network that uses the Internet
Protocol).
SIP
SIP stands for Session Initiation Protocol. SIP is a signalling standard that lets one
network device (like a computer or the ZyXEL Device) send messages to another.
In VoIP, these messages are about phone calls over the network. For example,
when you dial a number on your ZyXEL Device, it sends a SIP message over the
network asking the other device (the number you dialed) to take part in the call.
SIP Accounts
A SIP account is a type of VoIP account. It is an arrangement with a service
provider that lets you make phone calls over the Internet. When you set the
ZyXEL Device to use your SIP account to make calls, the ZyXEL Device is able to
send all the information about the phone call to your service provider on the
Internet.
Voice Activity Detection/Silence Suppression
Voice Activity Detection (VAD) detects whether or not speech is present. This lets
the ZyXEL Device reduce the bandwidth that a call uses by not transmitting “silent
packets” when you are not speaking.
Comfort Noise Generation
When using VAD, the ZyXEL Device generates comfort noise when the other party
is not speaking. The comfort noise lets you know that the line is still connected as
total silence could easily be mistaken for a lost connection.
Echo Cancellation
G.168 is an ITU-T standard for eliminating the echo caused by the sound of your
voice reverberating in the telephone receiver while you talk.
Summary of Contents for P-2601HN(L)-F1 Series
Page 2: ......
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 ...