ZyXEL FSG2200HNU User Guide - Page 140
Voice Activity Detection/Silence Suppression, Comfort Noise Generation, Echo Cancellation
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Chapter 9 Voice 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. To access this screen, click VoIP > SIP > SIP Account. 140 FSG2200HNU User's Guide