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CONFIGURATION: AUDIO SETTINGS SCREEN

Use the Configuration: Audio Settings screen (see figure 2.12) to configure the voice activation detection

settings and to prioritize your preferred audio codecs.

•

Enable VVAD

: Click the check box to enable VAD (voice activity detection) or uncheck the box to disable it

(VAD is enabled by default). Voice activity detection is a software application that allows a data network

carrying voice traffic over the internet to detect the absence of audio and conserve bandwidth by

preventing the transmission of “silent packets” over the network. VAD can also be used to forward idle

noise characteristics to a remote IP telephone so that the listener will not think the line has gone dead

when the speaker is not actively speaking.When VAD is enabled,

VAD NNoise MMatching

is active. When VAD is

disabled, the audio sends a constant stream of audio data, even when there is silence.

If VAD is enabled and the active audio codec is G.723.1 or G.729A/B, silence (SID) packets will be sent

when silence is detected according to the description in standards G.723.1 and G.729 Appendix B,

respectively.

If VAD is enabled, G.711 is the active codec, and VAD Noise Matching is set to NONE, no audio is sent

and no silence packets are sent when silence is detected.

If VAD is enabled, G.711 is the active codec, and VAD Noise Matching is set to LEVEL, single-byte CNG

packets are sent with the current noise volume level when silence is detected.

If VAD is enabled, G.711 is the active codec, and VAD Noise Matching is set to G711A2, CNG packets are

formatted according to G.711 Appendix II standard and the VAD LP Noise Order corresponds to the M

coefficient in the Linear Prediction synthesis filter when silence is detected.

•

VAD NNoise MMatching

: Click the radio button for the type of VAD noise matching you prefer. VAD noise

matching is the dB level of comfort noise that is transmitted that equals the floor noise in order to ensure

that the receiver does not think the phone has hung up when no speaking is happening. You must also

enter the VAD Noise LP Order you prefer. VAD noise matching is enabled by default and LP order values

range from 1 to 10, with 5 being the default.

•

Preferred AAudio CCodecs

: Order the audio codecs in the sequence you prefer, from most preferred to least

preferred. Select the codec you wish to move and then Use the

and

Down

buttons to move it up/down

the list. Repeat this for each codec you wish to re-order.

Click the

Apply

button to activate any changes made to the Audio Settings screen.

FIGURE 2.12 Configuration: Audio Settings screen

1 2 ... 15 16 17 18 19 20 21 22 23 24 25 ... 43 44

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