How do I use a modem to call a phone and play a wave file over it

Hi,

Please check the below code.

System.IO.Ports.SerialPort comPort;
comPort = new System.IO.Ports.SerialPort("Com2", 115200, System.IO.Ports.Parity.None, 8, StopBits.One);
comPort.DtrEnable = true;
//Switch to Voice Mode
comPort.Write("AT+FCLASS=8" + System.Convert.ToChar(13).ToString());
//Call Number
comPort.Write("ATDT1231234" + System.Convert.ToChar(13).ToString());
//Enter Voice-Transmission Mode
comPort.Write("AT+VTX" + System.Convert.ToChar(13).ToString());
bool MSwitch = false;
byte[] buffer = new byte[20000];
FileStream strm = new FileStream(@"C:\Users\Master\Desktop\Prmpt445.wav", System.IO.FileMode.Open);
MemoryStream ms = new MemoryStream();
int count = ms.Read(buffer, 44, buffer.Length-44);
BinaryReader rdr = new BinaryReader(strm);
while (!MSwitch)
{
byte[] bt = new byte[1024];
bt = rdr.ReadBytes(1024);
if (bt.Length == 0)
{
MSwitch = true;
break;
}
comPort.Write(bt, 0, bt.Length);
}
strm.Close();
strm.Dispose();


Hope this helps.

Regards,
Anand Subramanian.