Elastix IVR Recording PCM Encoded, 16 Bits, at 8000Hz
You can record your IVR prompts by two ways one is by your Telephone Extension and another is with Sound Recorder software.
1- Go to Elastix PBX setting > Systems Recordings
Give your Extension no an press Go.
Now go to your Extension and press *99 and record .
2- Download a Software Dictation Buddy
http://www.libertyrecording.com/TB_main_Recorder.htm
Install the Software
Click on Properties
Click on Recording Under Sound Quality Click on Change to Change the format Elastix compatible
PCM Encoded, 16 Bits, at 8000Hz .
Save your Profile .
Now you can Start Recording and upload to Systems Recordings on Elastix .
Another article i got
http://www.geardownload.com/multimedia/weeny-free-audio-converter-download.html
Choose your files from the AddFiles option and in the output format select the output format as Mp3 and in the quality menu select the 320 kbit/s. this one is good for good quality sound in astrick.