Page 42
MOCET IP3062 Professional IP Phone Administrators' Guide
Chapter 6: Setting Up Phone Audio
Features
After you set up your IP3062 phones on the network, users can send and receive calls
using the default configuration. However, you might consider modifications that optimize
the audio quality of your network.
Frequency bandwidth is one of the most critical elements affecting the intelligibility of
speech in telephony. Complicating the intelligibility of telephony speech in today’s world is
background noise, variations in environmental reverberation, and communication among
persons speaking a variety of native languages. While VoIP technology can broaden the
frequency bandwidth and improve sound quality and intelligibility, it can also increase the
network load and create a demand for lower raw bit rates.
This chapter describes the audio sound quality features and options you can configure for
your IP3062 phones. Use these features and options to optimize the conditions of your
organization’s phone network system.
This chapter shows you how to update your configuration for the following audio-related
features:
Acoustic Echo Cancellation and Voice Activity Detection
Generating Dual Tone Multi-Frequency (DTMF) Tones
Audio
Codecs
Acoustic Echo Cancellation and Voice Activity Detection
The IP3062 phone uses advanced acoustic echo cancellation (AEC) for handsfree
operation using the speakerphone. In addition, it also provides voice activity detection
(VAD) which is to detect periods of silence in the transmit data path, so the phone doesn’t
have to transmit unnecessary data packets for outgoing audio. This process conserves
network bandwidth. The AEC and VAD parameters in the following illustration will help you
set up this feature.
Generating Dual Tone Multi-Frequency (DTMF) Tones
The IP3062 phone generates dual tone multi-frequency (DTMF) tones in response to user
dialing on the dial pad. These tones are transmitted in the real-time transport protocol
(RTP) streams of connected calls. The phone can encode the DTMF tones using the
