[Asterisk-Dev] Voicemail to email volume change patch

[Aaron Daniel]

My boss and I have been working on a patch to the voicemail code, and 
I'd like to see what everyone thinks of it.  I'd like suggestions and 
stuff on anything that needs to be changed, as this is the first time 
we've patched the code, and would like to submit it for use later on in 
the code.

It basically sends the voicemail attachment through sox to increase (or 
decrease) the volume of the message as need be, and then sends the 
normalized file to the user.

To turn it on, put:

dovolgain=yes
volgain=<value>

into the voicemail.conf file.  volgain can be any value of volume that 
will work for sox (we're using 10 for now).

We're using asterisk-1.2.1-stable, directly off asterisk's site, just so 
ya'll know.

Aaron
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