User's Manual

Administrative Guide Configuration

Figure 6-37. Voice – System – Transmission

Audio: It is used to set many Audio-related options. It will be applied to the all FXS and

PSTN lines.

Country: It may be used to determine not only the Caller ID detection / transmission

method but also ring/tone cadence/frequency.

Voice Active Detection: Enable or Disable; VAD is a technique that detects the

absence of audio and conserved bandwidth by preventing the transmission of

“silence packets” over the network. Normally, this is set to On.

Packet Loss Concealment: Enable or Disable

Echo Cancellation Tail Length: Echo cancel time; 0 value disables Echo Canceller.

RTP Packet Size: 10/20/.../60 ms