User's Manual Part 2

BM2022w User’s Guide 177
CHAPTER 11
The VoIP Line Screens
11.1 Overview
The VoIP > Line screens allow you to configure the volume, echo cancellation, VAD settings and
custom tones for phone ports 1 and 2 which map to SIP accounts 1 and 2 (see Chapter 10 on page
163). Since both the Line 1 and Line 2 screens are quite similar, this section uses the VoIP >
Line 1 screens to describe the fields.
11.1.1 What You Can Do in This Chapter
•The Phone screen (Section 11.2 on page 178) lets you configure phone settings.
•The Voice screen (Section 11.3 on page 178) lets you configure voice settings.
•The Region screen (Section 11.4 on page 179) lets you configure which country of the world the
BM2022w is in.
11.1.2 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 BM2022w
reduce the bandwidth that a call uses by not transmitting “silent packets” when you are not
speaking.
When using VAD, the BM2022w 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.