title: Unknown selected data source for Port iPhone
body: <p>I am implementing Pause-Resume Camera for iOS using this
  <a href="http://www.gdcl.co.uk/iOS/" rel="nofollow">CameraEngine</a>. The problem is that when a user receives a phone call and accepts it, the camera preview screen is stuck. During the phone call I can see this error twice</p>
  
  <pre><code>ValidateRequiredFields: Unknown selected data source for Port iPhone
  Microphone (type: MicrophoneBuiltIn)
  </code></pre>
  
  <p>Is it possible to restart it? </p>
  
  <p>Also is there a way how to generate this interruption another way then calling on the phone and accepting it because debugging can get quite expensive then. I have tried Siri but it doesn't produce this problem.</p>