[Asterisk-Users] Disabled echo canceller because of tone (rx)

[Moshe Yudkowsky]

At 10:30 2003-06-13 -0400, John Congdon wrote:
>Does anyone know what this means?  It is in DMESG, and we have
>people complaining about echo.
>
>Disabled echo canceller because of tone (rx)


Guess: to prevent multiple echo cancellers from working on the same call, 
an echo canceller adds a tone -- was it 100 Hz? -- to the voice path. Other 
echo cancellers, after detecting the tone, will stop.



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  Moshe Yudkowsky
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