Call is not working from iOS to Android

I create the both the applications(iOS and android).
When I initiated the Call from iOS to Android is not working.

But when Initiated the calls:

  • iOS to iOS is working
  • Android to iOS is working
  • Android to Android is working

Could I get any help to resolve this issue?

Even today I try to Call from Web/Call Studio to Android Demo application its not working.
But When I call from Github Demo application to Wen logged In user the call connected successfully and working perfect.
Now the Issue clear:
We cannot call on Android device’s user from either iOS or Web/Call Studio.

SendBird team please check this issue.
SendBird Application is showing only the notification, not even ringing, So something is wrong in android SDK ?