Enabling VAD
The voice activity detection (VAD) discriminates between silence and speech on a voice connection according to their energies. VAD reduces the bandwidth requirements of a voice connection by not generating traffic during periods of silence in an active voice connection. Speech signals are generated and transmitted only when an active voice segment is detected. Researches show that VAD can save the transmission bandwidth by 50%.
To enable VAD:
Step | Command | Remarks |
|---|---|---|
1. Enter system view. | system-view | N/A |
2. Enter voice view. | voice-setup | N/A |
3. Enter voice dial program view. | dial-program | N/A |
4. Create a POTS voice entity and enter POTS voice entity view. | entity entity-number pots | N/A |
5. Enable VAD. | vad-on [ g711 | g723r53 | g723r63 | g729a | g729r8 ] | Disabled by default. The G.726 codec does not support VAD. |