title: Is there any way to create call recording app in flutter?
body: <p>So, I have tried to develop an application for call recording :</p>
  
  <ul>
  <li>By using <a href="https://pub.dev/packages/flutter_sound" rel="noreferrer">flutter_sound</a> to record a call and I am detecting call state using <a href="https://pub.dev/packages/phone_state_i" rel="noreferrer">phone_state_i</a> but succeeded to record the call with the voice of MICROPHONE only cannot record the voice of other people (INCOMING voice). </li>
  <li>Then I tried to record calls using android through <a href="https://flutter.dev/docs/development/platform-integration/platform-channels" rel="noreferrer">flutter native integration</a> but unable to achieve. So even here I got succeeded to record only the voice of a microphone.</li>
  </ul>
  
  <p>I guess I am unable to get the concept of VOICE_DOWNLINK and VOICE_UPLINK. And got to know that VOICE_CALL is deprecated. So, I am badly stuck and need some expert advice.  </p>