at call commend doesn't work
<p>I'm trying to make a call from my PC using C# via a serial port.</p>

<p>This is the example code I have written:</p>

<pre><code>port.Open();
port.WriteLine("ATD01007866515;");
System.Threading.Thread.Sleep(500);
string ss = port.ReadExisting();
if (ss.EndsWith("\r\nOK\r\n"))
{
    MessageBox.Show("Modem is connected");
}
port.Close();
</code></pre>

<p>It isn't working, however.</p>
