このページは2010年 5月 27日, 08:23に更新されました by Kyosuke
VADとComfortNoiseサポートについて
目次
ヘッダーがありません1. Explanation:
Asterisk does not (yet) support voice activity detection (and comfort noise generation).
Voice activity detection is when a softphone or hardphone tries to detect if the speaker is silent, and will send no audio packets for that time. (to save on bandwidth).
As this might sound unnatural for the other party of the call, if no background noise is sent. (it would sound like a walkie talkie)
That is why a PBX or the other phone could generate comfort noise, which is simulated noise to make the call sound more natural.
Asterisk does not support VAD and thus also does not support the generation of comfort noise.
The best thing to do for now, is to completely disable Voice activity detection on the clients connected to asterisk.
On recent asterisk versions, asterisk will tell you the ip of the phone sending those packets. You really want to disable it as it will flood you asterisk server and generate bad quality audio.
Voice activity detection is when a softphone or hardphone tries to detect if the speaker is silent, and will send no audio packets for that time. (to save on bandwidth).
As this might sound unnatural for the other party of the call, if no background noise is sent. (it would sound like a walkie talkie)
That is why a PBX or the other phone could generate comfort noise, which is simulated noise to make the call sound more natural.
Asterisk does not support VAD and thus also does not support the generation of comfort noise.
The best thing to do for now, is to completely disable Voice activity detection on the clients connected to asterisk.
On recent asterisk versions, asterisk will tell you the ip of the phone sending those packets. You really want to disable it as it will flood you asterisk server and generate bad quality audio.
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