Voice mail file not playing

I have configured voicemail for users. After mail has been recorded. i am not able play the audio files. When i play gsm file it shows as “Stream contains no data”, WAV file not playing. Please help me to fix this. I am using asterisk 1.6. Thanks

Opps… Sorry guys… Mistake from my side. Actuall mike is not working in my system. So that it creates empty files…

The best way is; configure the recording format is wav49 in your voicemail.conf that will the best. you can play your voice mail file in any system without install any special codec.