title: iOS 14.5 WKWebView's getUserMedia errors NotReadableError after CallKit takes over
body: <p>We use Ionic 5 with Capacitor 3, using the latest iOS version which <strong>supports</strong> getUserMedia for capacitor scheme.</p>
  <p>getUserMedia <strong>does</strong> work for me, but once i've implemented the CallKit provider, i get:</p>
  <pre><code>NotReadableError: The I/O read operation failed
  </code></pre>
  <p>Whenever I answer the call. We've tried deactivating the AudioSession using</p>
  <pre><code>audioSession.setActive(false)
  </code></pre>
  <p>inside all these methods:</p>
  <pre><code>provider(_ provider: CXProvider, didActivate audioSession: AVAudioSession)
  provider(_ provider: CXProvider, perform action: CXAnswerCallAction)
  pushRegistry(_ registry: PKPushRegistry, didReceiveIncomingPushWith payload: PKPushPayload, for type: PKPushType, completion: @escaping () -&gt; Void)
  </code></pre>
  <p>Both nothing helps. Is there a priority factor or do i need to do some interruptions?</p>