ZyXEL Communications 2002 Series - Manual (Page 53)

Prestige 2002 Series User’s Guide
Chapter 7 Phone 53
C
H A P T E R
7
Phone
This chapter covers how to adjust the Prestige’s phone settings.
7.1 Phone Introduction
You can configure the volume, echo cancellation and VAD settings for each individual phone
port on the Prestige. You can also select which SIP account to use for making outgoing calls.
7.1.1 Voice Activity Detection/Silence Suppression
Voice Activity Detection (VAD) detects whether or not speech is present. This lets the
Prestige reduce the bandwidth that a call uses by not transmitting “silent packets” when you
are not speaking.
7.1.2 Comfort Noise Generation
When using VAD, the Prestige generates and sends comfort noise when you are not speaking.
Comfort noise uses the lowest possible transmission bandwidth to match the background
noise. The comfort noise lets the person at the other end of the connection know that the line is
still connected (total silence would easily be mistaken for a lost connection).
7.1.3 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.
7.2 Phone Port Configuration
Click PHONE in the navigation panel to display the following screen.