title: Flutter - webRTC Video Call signalling doesn't work
body: <p>I am able to implement voice and video call using agora.io library which is available at <a href="https://www.agora.io/" rel="nofollow noreferrer">https://www.agora.io/</a> &amp;&amp; <a href="https://github.com/AgoraIO/Flutter-SDK" rel="nofollow noreferrer">https://github.com/AgoraIO/Flutter-SDK</a></p>
  
  <p>how ever the process for starting a call is both user has to join a particular channel name defined by the user manually or automatically. which is not the practical way. 
  Is there any way to create a separate signalling system (may be using, nodejs socket, firebase or one-signal notification? )</p>
  
  <p>What's the simultaneous/parallel way to be used along side that? 
  or what's the complete alternative?</p>