sound files and modems

Hi,

For my final project at school I am trying to send a sound file from
computer to telephone, via modem.

Whenever I send it as a byte stream, it is not heard from telephone
instead only a buzz is heard. Before sending the sound file I send
the following commands to modem:

send("AT#CLS=8");

expect("OK");

send("ATS39.6=1");

expect("OK");

send("AT#VLS=6");

expect("VCON");

send("AT#VTX"); //transmit

expect("CONNECT");

expect(""); expect("VCON");

Then I send the sound file but I can not hear it from telephone. (I
used a sound file with “RAW” extension and also a WAV file
which has properties as “PCM, 8000Hz, 16 bit, mono” but none
of them works) When I send the command “AT#VSM=?” to my modem
it gives me “128, GSM/AZT,8000 129,G.721 ADPCM/AZT, 8000 and 130,
IMAADPCM/AZT,8000” Does it mean I have to send a sound file with GSM
format?

If someone can give me some information about transmiting sound to
telephone via modem, this will really be helpful. Thanks in advance for
any help.

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