I want to play wave file On Motorola SM56SpeakerPhone Modem > i am not using TAPi. I am trying to build Voice answering machine.I am using AT commands. I have 2 questions

1. Does ATA command answers only in data mode or it also answers in voice mode
2. I create handle using CreateFile and then i am trying to playwave file using WriteFile function, but i don't hear anything, only some noise.

Please explain me how to play wave file using CreateFile handle or i need to use some other function.
Please Help.

Thanks
Ajit