ring-android/app/src/main/res/menu/conversation_actions.xml

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto">
        <item
            android:id="@+id/conv_action_videocall"
            android:icon="@drawable/ic_videocam_white_24dp"
            android:title="Video call"
            app:showAsAction="always"
            />
        <item
            android:id="@+id/conv_action_audiocall"
            android:icon="@drawable/ic_call_white_24dp"
            android:title="Audio call"
            app:showAsAction="always"/>
</menu>