title: Using 3G modem to make a voice call
body: <p>Most of the 3G modems (USB sticks) support voice calls, but all of them can do this only through the dashboard software which is shipped with them.</p>
  
  <p>Do you have any information, how to get the voice from and pass the mic data to the 3G modem in Delphi?</p>
  
  <p>When I plug in, it installs 4 COM ports:</p>
  
  <ul>
  <li>NEMA</li>
  <li>Diagnostic</li>
  <li>Application Interface</li>
  <li>standard COM port which can be used to pass AT commands</li>
  </ul>
  
  <p>Currently, via the standard COM port I can pass the <em>ATDT12345678</em> command to call a number, the connection establishes, and the other end is ringing. When I answer the call, I don't hear anything - neither on the computer which the 3G modem is connected to, nor on the called phone.</p>
  
  <p>Any answer or workaround is appreciated.</p>