Configuring Audio Features
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3. Enter the minimum delay time for adaptive jitter buffer in the Min Delay field.
The valid value ranges from 20 to 300.
4. Enter the maximum delay time for adaptive jitter buffer in the Max Delay field.
The valid value ranges from 20 to 300.
5. Enter the fixed delay time for fixed jitter buffer in the Normal field.
The valid value ranges from 20 to 300.
6. Click Confirm to accept the change.
DTMF
DTMF (Dual Tone Multi-frequency), better known as touch-tone, is used for telecommunication
signaling over analog telephone lines in the voice-frequency band. DTMF is the signal sent from
the IP phone to the network, which is generated when pressing the IP phone’s keypad during a
call. Each key pressed on the IP phone generates one sinusoidal tone of two frequencies. One is
generated from a high frequency group and the other from a low frequency group.
The DTMF keypad is laid out in a 4×4 matrix, with each row representing a low frequency, and
each column representing a high frequency. Pressing a digit key (such as '1') will generate a
sinusoidal tone for each of two frequencies (697 and 1209 hertz (Hz)).
DTMF Keypad Frequencies:
Note
The IP phones will not send DTMF sequence when the call is placed on hold or is held,
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