#include < windows.h >

HANDLE  hCom = ((HANDLE)(0));

int  main()
{
  DCB                dcb;
  unsigned long int  n = 0;
  char *             str = "COM1";

  hCom = CreateFile( str, (GENERIC_READ | GENERIC_WRITE),
                     0, NULL, OPEN_EXISTING, 0, NULL );

  GetCommState ( hCom, (&(dcb)) );

  dcb.BaudRate = CBR_9600;
  dcb.ByteSize = 8;
  dcb.Parity   = NOPARITY;
  dcb.StopBits = ONESTOPBIT;

  SetCommState ( hCom, (&(dcb)) );

  WriteFile( hCom, "ATM2\r", strlen("ATM2\r"), (&(n)), 0 );
  FlushFileBuffers( hCom );
  Sleep(1000);

  WriteFile( hCom, "ATH1\r", strlen("ATH1\r"), (&(n)), 0 );
  FlushFileBuffers( hCom );
  Sleep(1000);

  WriteFile( hCom, "ATDT5551212;\r", strlen("ATDT5551212;\r"), (&(n)), 0 );
  FlushFileBuffers( hCom );
  Sleep(3000);

  WriteFile( hCom, "ATH0\r", strlen("ATH0\r"), (&(n)), 0 );
  FlushFileBuffers( hCom );
  Sleep(1000);

  WriteFile( hCom, "ATM0\r", strlen("ATM0\r"), (&(n)), 0 );
  FlushFileBuffers( hCom );
  Sleep(1000);

  CloseHandle( hCom );

  return(0);
}