Cisco TES301 User Manual page 54

Chapter 3 Configuration and Operation of the TES301
2 Complete the fields for the Voice tab.

Voice Active Detection—Voice activity detection (VAD) is a technique used
in speech processing in which the presence or absence of human speech is
detected. The main uses of VAD are in speech coding and speech recognition.
It can facilitate speech processing and can also be used to deactivate some
processes during a non-speech portion of an audio session. This technique is
used to avoid unnecessary coding and transmission of silence packets in
Voice over Internet Protocol applications, saving on computational resources
and network bandwidth.

Comfort Noise Generation—If enable this setting, CPE can automatically
generate artificial background noise to remote side when no speech during
voice call.

Echo Cancellation—Echo cancellation is used to describe the process of
removing echo from a voice communication in order to improve voice
quality.

Voice Fax Mode—You can select FAX relay mode to transmit FAX data
through IP network, None indicates CPE cannot send out FAX data but only
receive FAX data, G711 Pass-through indicates CPE send out FAX data with
G.711 codec, T.38 indicates CPE send out FAX data only support T.38
protocol, T.38 Fallback to Pass-through indicates CPE will try to use T.38, but
if transmission with T.38 failure, CPE automatically try to send out FAX data
with G.711 codec.
3 Click Save Changes to save the information or Cancel to return to the
dashboard.
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