title: CallKit error com.apple.CallKit.error.requesttransaction error 7
body: <p>I'm using Twilio voice quickstart code <a href="https://github.com/twilio/voice-quickstart-swift" rel="noreferrer">https://github.com/twilio/voice-quickstart-swift</a>.
  When I make a client to client call, call doesn't connect. CallKit runs in the background though, I can see the green notification bar when I send app in the background.
  Following is the error:
  StartCallAction transaction request failed: The operation couldn’t be completed. (com.apple.CallKit.error.requesttransaction error 7.)</p>
  
  <p>As you can see Googling doesn't help as there doesn't seem to be any solution around?</p>
  
  <p>Does anyone know how to fix or debug it further?</p>
  
  <p>Updated: 
  Attaching VoIP settings, it's certainly enabled.
  <a href="https://i.stack.imgur.com/wWsmK.png" rel="noreferrer"><img src="https://i.stack.imgur.com/wWsmK.png" alt="VOIP Settings"></a></p>