Chapter 11 Phone; Phone Overview; Voice Activity Detection/Silence Suppression/Comfort Noise; Echo Cancellation - ZyXEL Communications MAX-200M1 Series User Manual

Use these screens to configure the phone you use to make phone calls with the ZyXEL Device.

11.1 Phone Overview

You can configure the volume, echo cancellation, VAD settings and custom tones for the
phone port on the ZyXEL Device. You can also select which SIP account to use for making
outgoing calls.

11.1.1 Voice Activity Detection/Silence Suppression/Comfort Noise

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.
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.

11.1.2 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.

11.1.3 Supplementary Phone Services Overview

Supplementary services such as call hold, call waiting, call transfer, etc. are generally
available from your VoIP service provider. The ZyXEL Device supports the following
services:
• Call Hold
• Call Waiting
• Making a Second Call
• Call Transfer
• Call Forwarding
• Three-Way Conference
• Internal Calls
• Caller ID

Chapter 11 Phone

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