Signal-Android/app/src/main/res/layout/webrtc_call_view_toolbar.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.appcompat.widget.Toolbar xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    app:contentInsetStart="0dp">

    <androidx.constraintlayout.widget.ConstraintLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal">

        <androidx.constraintlayout.widget.Guideline
            android:id="@+id/action_bar_guideline"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:orientation="horizontal"
            app:layout_constraintGuide_begin="?actionBarSize" />

        <org.thoughtcrime.securesms.components.emoji.EmojiTextView
            android:id="@+id/call_screen_recipient_name"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:gravity="center_horizontal"
            android:textAppearance="@style/TextAppearance.Signal.Body1.Bold"
            android:textColor="@color/core_white"
            app:layout_constraintBottom_toTopOf="@id/action_bar_guideline"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent"
            tools:text="Kiera Thompson" />

        <TextView
            android:id="@+id/call_screen_status"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:gravity="center_horizontal"
            android:textAppearance="@style/TextAppearance.Signal.Subtitle"
            android:textColor="@color/core_white"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@id/call_screen_recipient_name"
            tools:text="Signal Calling..." />

    </androidx.constraintlayout.widget.ConstraintLayout>

</androidx.appcompat.widget.Toolbar>