ZyXEL Communications 2002 Phone, 7.1 Phone Introduction, 7.2 Phone Port Configuration, 7.1.3 Echo Cancellation, 7.1.2 Comfort Noise Generation

P-2002 Series User’s Guide

CHAPTER 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 the other party is not speaking. Comfort noise uses the lowest possible transmission bandwidth to match the background noise. The comfort noise lets you know that the line is still connected as total silence could 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. Use this screen to configure phone port settings that are specific to an individual phone port.

Chapter 7 Phone 67