[Asterisk-Dev] Dev Meeting this week.

[Steve Kann]

On Apr 21, 2005, at 10:31 PM, Stephan A. Edelman wrote:

>
> I also consistently get voicemail recordings from a zap channel that 
> are
> barely audible. The gain on the zap channel needs to be adjusted on the
> fly when a voicemail message is left. Perhaps, some fancy software AGC
> and companding (to keep the volume at say, 90% of the clipping level) 
> in
> combination with predefined zap gain.

libspeex has a reasonably good software AGC implementation, in the 
preprocessor (you don't need to use the codec for this).