Cisco TES301, Руководство пользователя

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Chapter 3 Configuration and Operation of the TES301
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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 —Select Enabled to configure the TES301 to
automatically generate artificial background noise when no speech is
occurring on a 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 —Choose from the following options for transmitting and
receiving FAX transmissions:
–
FAX —Configures the TES301 to use relay mode to transmit FAX data
through an IP network.
–
None —Indicates that the TES301 cannot send out FAX data but can only
receive FAX data.
–
G711 Pass-through —Configures the TES301 to send out FAX data with
G.711 codec.
– T.38 —Configures the TES301 to send out FAX data using the T.38
protocol.