ZyXEL MAX208M2W User Guide - Page 171
The VoIP Line Screens, 11.1 Overview, 11.1.1 What You Need to Know
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CHAPTER 11 The VoIP Line Screens 11.1 Overview The features mentioned in this chapter are for models with VoIP function. The VoIP > Line 1 (or Line 2) screens allow you to configure the volume, echo cancellation, VAD settings and custom tones for the phone port which maps to the SIP account (see Chapter 10 on page 157). Note: If your WiMAX Device has only one phone port, there is only one line. Note: You can identify the number of phone ports available on your WiMAX Device by its model name. See Section 1.1 on page 17 for more information. 11.1.1 What You Need to Know The following terms and concepts may help as you read through this chapter. Voice Activity Detection/Silence Suppression/Comfort Noise Voice Activity Detection (VAD) detects whether or not speech is present. This lets the WiMAX Device reduce the bandwidth that a call uses by not transmitting "silent packets" when you are not speaking. When using VAD, the WiMAX 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. WiMAX Device Configuration User's Guide 171