title: Voice call with gsm-modem by C#
body: <p>im new in c# and i wanna right a code for have a voice call through the GSM modem , actually don't know about how to receive and send voice or stream that ,if any one knows about how to do it please help me with this problem.
  i just found <a href="https://social.msdn.microsoft.com/Forums/vstudio/en-US/3fd8acc1-252b-4465-a38b-021b2499518d/problems-retrieving-voice-data-from-voice-modem-using-net-serialport-and-at-commands?forum=netfxbcl" rel="nofollow">this</a> but didn't understand enough to develop my application.
  every thing i know is just to send command ,unfortunately i do not even know the AT-Commands.</p>
  
  <pre><code>Port gsmPort=new Port();
  gsmPort.Name="COM3";
  gsmPort.open();
  gsmPort.writeLine("AT\r");
  </code></pre>