ZyXEL P-2601HNL-F1 User Guide - Page 176
What You Need to Know, VoIP, P-2601HNL-F1 Series User's Guide
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Chapter 16 VoIP 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 messagecarrying 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. 176 P-2601HN(L)-F1 Series User's Guide