I just did one quick test, unscientific at best, and I think the above works reasonably well. Instead of leaving a message, I actually created a dummy vm user, and used VoicemailMain to record a "busy.wav" file, which I then moved to a normal "sound" file, and used the Playback application. It sounded enough louder to me than the original "Record" application made it.
Steven Critchfield wrote:
I've not experienced the low volume when using record, but I have when using the record command in AGI. Upon looking around to see what it was that caused voicemail to be of such a passable volume, but not our AGI apps, I noticed that there is a section in format_wav.c that will bit shift the audio data up to increase volume. When I changed our application from recording in GSM to recording in WAV, it fixed some of our volume problems.
Not necessarily a solution to your problem but a few data points to help sort the problem out.
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