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Telephone Advance

Figure 5-14. Telephone Advance setting

H.323 Telephone Advance Configuration

Silence Compression

(VAD)

If this function is enabled, when silence is occurred for a period of

time, no data will be sent across the network during this period in

order to save bandwidth.

(If you use Asterisk, please disable Silence Compression, it maybe

make you call disconnect.)

Voice Codec option

The codec is used to compress the voice signal into data packets.

Each codec has different bandwidth requirement. There are four

kinds of codec, G.723, G.729AB, G.711_u and G.711_A. The

default value is G.723.

Dial Complete Tone

When you use the VoIP call, you will hear “DuDu” voice that is dial

complete tone. If you don’t want to hear that tone, you can disable

it. (Default is enabling).

Dial Termination key

Setting Termination key to speed up VoIP dial. Select “*” or “#” to

Termination key.

FXS Impedance

The FXS provides 600/900 OHM impedances for selection.

Phone (Line) in/out

volume:

You can adjust the Phone (Line) in/out volume, range from -9db to

9db

(If you adjust too bigger, maybe generation some ECHO or noise)

Ring Frequency

You can configure how long the Ring Frequency do you want to

use.

DTMF tone power

Sometimes you input DTMF, but no request. You can adjust this

function, range from -6db to +6db.