single calling accept option missing in azure sdk and video calls is not working if the app is in background

Question

In android 'com.azure.android:azure-communication-calling' , videocall call was automatically taken in single mode.No accept call option or method is there.
Azure calls not work when app is in background

private void handleIncomingCall() {
callAgent.addOnIncomingCallListener((incomingCall) -> {
this.incomingCall = incomingCall;
Executors.newCachedThreadPool().submit(this::answerIncomingCall);
});
}