linphone-android/app/src/main/res/layout/voip_activity.xml

<?xml version="1.0" encoding="utf-8"?>
<layout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:app="http://schemas.android.com/apk/res-auto">

    <data>
        <import type="android.view.View" />
        <variable
            name="controlsViewModel"
            type="org.linphone.activities.voip.viewmodels.ControlsViewModel" />
    </data>

    <androidx.constraintlayout.widget.ConstraintLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:keepScreenOn="true">

        <androidx.fragment.app.FragmentContainerView
            android:id="@+id/status_fragment"
            android:visibility="@{controlsViewModel.fullScreenMode || controlsViewModel.pipMode ? View.GONE : View.VISIBLE}"
            android:name="org.linphone.activities.voip.fragments.StatusFragment"
            android:layout_width="match_parent"
            android:layout_height="@dimen/status_fragment_size"
            app:layout_constraintTop_toTopOf="parent"
            tools:layout="@layout/voip_status_fragment" />

        <androidx.fragment.app.FragmentContainerView
            android:id="@+id/nav_host_fragment"
            android:name="androidx.navigation.fragment.NavHostFragment"
            android:layout_width="match_parent"
            android:layout_height="0dp"
            app:defaultNavHost="true"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintTop_toBottomOf="@id/status_fragment"
            app:navGraph="@navigation/call_nav_graph"
            tools:layout="@layout/voip_single_call_fragment" />

    </androidx.constraintlayout.widget.ConstraintLayout>

</layout>