linphone-android/res/layout/incall.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <FrameLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content" >

        <LinearLayout
            android:id="@+id/fragmentContainer"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:orientation="horizontal"
            android:paddingTop="20dp" />

        <fragment
            android:id="@+id/status"
            android:name="org.linphone.StatusFragment"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            tools:layout="@layout/status" />
        
    </FrameLayout>

    <ImageView
        android:id="@+id/switchCamera"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:contentDescription="@string/content_description_switch_camera"
        android:paddingTop="20dp"
        android:src="@drawable/switch_camera"
        android:visibility="gone" />

    <LinearLayout
        android:id="@+id/menu"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:orientation="vertical" >

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_weight="1"
            android:orientation="horizontal" >

            <View
                android:layout_width="match_parent"
                android:layout_height="75dp"
                android:layout_weight="1"
                android:visibility="invisible" />

            <View
                android:layout_width="match_parent"
                android:layout_height="75dp"
                android:layout_weight="1"
                android:visibility="invisible" />

            <View
                android:layout_width="match_parent"
                android:layout_height="75dp"
                android:layout_weight="1"
                android:visibility="invisible" />

            <ImageView
                android:id="@+id/transfer"
                android:layout_width="match_parent"
                android:layout_height="75dp"
                android:layout_weight="1"
                android:scaleType="fitXY"
                android:src="@drawable/options_transfer"
                android:visibility="gone" />
        </LinearLayout>

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_weight="1"
            android:orientation="horizontal" >

            <View
                android:layout_width="match_parent"
                android:layout_height="75dp"
                android:layout_weight="1"
                android:visibility="invisible" />

            <View
                android:layout_width="match_parent"
                android:layout_height="75dp"
                android:layout_weight="1"
                android:visibility="invisible" />

            <View
                android:layout_width="match_parent"
                android:layout_height="75dp"
                android:layout_weight="1"
                android:visibility="invisible" />

            <ImageView
                android:id="@+id/addCall"
                android:layout_width="match_parent"
                android:layout_height="75dp"
                android:layout_weight="1"
                android:scaleType="fitXY"
                android:src="@drawable/options_add_call_alt"
                android:visibility="gone" />
            
        </LinearLayout>

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_weight="1"
            android:orientation="horizontal" >

            <ImageView
                android:id="@+id/video"
                android:layout_width="match_parent"
                android:layout_height="75dp"
                android:layout_weight="1"
                android:contentDescription="@string/content_description_switch_video"
                android:scaleType="fitXY"
                android:src="@drawable/video_off" />

            <ImageView
                android:id="@+id/micro"
                android:layout_width="match_parent"
                android:layout_height="75dp"
                android:layout_weight="1"
                android:contentDescription="@string/content_description_toggle_micro"
                android:scaleType="fitXY"
                android:src="@drawable/micro_on" />

            <ImageView
                android:id="@+id/speaker"
                android:layout_width="match_parent"
                android:layout_height="75dp"
                android:layout_weight="1"
                android:contentDescription="@string/content_description_toggle_speaker"
                android:scaleType="fitXY"
                android:src="@drawable/speaker_off" />

            <ImageView
                android:id="@+id/options"
                android:layout_width="match_parent"
                android:layout_height="75dp"
                android:layout_weight="1"
                android:scaleType="fitXY"
                android:src="@drawable/options" />
        </LinearLayout>

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="75dp"
            android:layout_weight="1"
            android:orientation="horizontal" >

            <ImageView
                android:id="@+id/pause"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:layout_weight="1"
                android:contentDescription="@string/content_description_pause"
                android:scaleType="fitXY"
                android:src="@drawable/pause_off" />

            <ImageView
                android:id="@+id/hangUp"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:layout_weight="1"
                android:contentDescription="@string/content_description_hang_up"
                android:scaleType="fitXY"
                android:src="@drawable/hangup" />

            <ImageView
                android:id="@+id/dialer"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:layout_weight="1"
                android:contentDescription="@string/content_description_numpad"
                android:scaleType="fitXY"
                android:src="@drawable/dialer_alt" />
        </LinearLayout>
    </LinearLayout>

</RelativeLayout>