Handle call and dial intents

call.axml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <TextView
        android:text="Calling"
        android:textAppearance="?android:attr/textAppearanceLarge"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center" />
    <TextView
        android:text="0000-0000-0000"
        android:textAppearance="?android:attr/textAppearanceMedium"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/textView1"
        android:layout_gravity="center" />
    <ImageView
        android:src="@android:drawable/sym_action_call"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/imageView1" />
</LinearLayout>

CallActivity.cs

using Android.App;
using Android.Content;
using Android.Content.PM;
using Android.OS;
using Android.Widget;

namespace Your.Namespace
{
    [Activity(Label = "Call", LaunchMode = LaunchMode.SingleTop)]
    [IntentFilter(new[] { Intent.ActionCall, Intent.ActionView },
        Categories = new[] { Intent.CategoryDefault },
        DataScheme = "tel")]
    public class CallActivity : Activity
    {
        private TextView _numberTextView;

        protected override void OnCreate(Bundle savedInstanceState)
        {
            base.OnCreate(savedInstanceState);

            SetContentView(Resource.Layout.call);

            _numberTextView = FindViewById<TextView>(Resource.Id.textView1);

            var numberUri = Intent.Data;
            _numberTextView.Text = numberUri.SchemeSpecificPart;
        }
    }
}

DialActivity.cs

using Android.App;
using Android.Content;
using Android.Content.PM;
using Android.OS;
using Android.Widget;

namespace Your.Namespace
{
    [Activity(Label = "Dial", LaunchMode = LaunchMode.SingleTop)]
    [IntentFilter(new[] { Intent.ActionDial, Intent.ActionCallButton, Intent.ActionView },
        Categories = new[] { Intent.CategoryDefault },
        DataScheme = "tel")]
    public class DialActivity : Activity
    {
        private TextView _numberTextView;

        protected override void OnCreate(Bundle savedInstanceState)
        {
            base.OnCreate(savedInstanceState);

            SetContentView(Resource.Layout.telephone);

            _numberTextView = FindViewById<TextView>(Resource.Id.textView1);

            var numberUri = Intent.Data;
            _numberTextView.Text = numberUri.SchemeSpecificPart;
        }
    }
}

mail.axml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <Button
        android:text="Dial"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/buttondial" />
    <Button
        android:text="Call"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/buttoncall" />
</LinearLayout>

MainActivity.cs

using Android.App;
using Android.Content;
using Android.Net;
using Android.OS;
using Android.Widget;

namespace Your.Namespace
{
    [Activity(Label = "Call/Dial Test", MainLauncher = true, Icon = "@drawable/icon")]
    public class MainActivity : Activity
    {
        protected override void OnCreate(Bundle bundle)
        {
            base.OnCreate(bundle);

            // Set our view from the "main" layout resource
            SetContentView(Resource.Layout.main);

            var call = FindViewById<Button>(Resource.Id.buttoncall);
            var dial = FindViewById<Button>(Resource.Id.buttondial);

            call.Click += (sender, args) =>
            {
                var number = Uri.Parse("tel:12345678");
                var intent = new Intent(Intent.ActionCall, number);
                StartActivity(intent);
            };

            dial.Click += (sender, args) =>
            {
                var number = Uri.Parse("tel:12345678");
                var intent = new Intent(Intent.ActionDial, number);
                StartActivity(intent);
            };
        }
    }
}

OutgoingCallReceiver.cs

using Android;
using Android.App;
using Android.Content;
using Android.Net;

[assembly: Permission(Name = Manifest.Permission.ProcessOutgoingCalls)]

namespace Your.Namespace
{
    [BroadcastReceiver(Enabled = true)]
    [IntentFilter(new[] { Intent.ActionNewOutgoingCall },
        Categories = new[] { Intent.CategoryDefault })]
    public class OutgoingCallReceiver : BroadcastReceiver
    {
        public override void OnReceive(Context context, Intent intent)
        {
            var phoneNumber = ResultData ?? intent.GetStringExtra(Intent.ExtraPhoneNumber);

            // my app will handle the data
            ResultData = null;

            // start my app
            var myCallerIntent = new Intent(context, typeof (CallActivity));
            myCallerIntent.SetData(Uri.Parse("tel:" + phoneNumber));
            myCallerIntent.SetFlags(ActivityFlags.NewTask);
            context.StartActivity(myCallerIntent);
        }
    }
}

telephone.axml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:padding="10dp">
    <LinearLayout
        android:orientation="horizontal"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginBottom="20dp">
        <TextView
            android:textAppearance="?android:attr/textAppearanceLarge"
            android:layout_weight="1"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:id="@+id/textView1"
            android:singleLine="true"
            android:inputType="phone"
            android:hint="number" />
        <Button
            android:text="Del"
            android:layout_width="60dp"
            android:layout_height="wrap_content"
            android:id="@+id/buttondel" />
    </LinearLayout>
    <LinearLayout
        android:orientation="horizontal"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">
        <Button
            android:text="1"
            android:layout_weight="1"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:id="@+id/button1" />
        <Button
            android:text="2"
            android:layout_weight="1"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:id="@+id/button2" />
        <Button
            android:text="3"
            android:layout_weight="1"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:id="@+id/button3" />
    </LinearLayout>
    <LinearLayout
        android:orientation="horizontal"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">
        <Button
            android:text="4"
            android:layout_weight="1"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:id="@+id/button4" />
        <Button
            android:text="5"
            android:layout_weight="1"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:id="@+id/button5" />
        <Button
            android:text="6"
            android:layout_weight="1"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:id="@+id/button6" />
    </LinearLayout>
    <LinearLayout
        android:orientation="horizontal"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">
        <Button
            android:text="7"
            android:layout_weight="1"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:id="@+id/button7" />
        <Button
            android:text="8"
            android:layout_weight="1"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:id="@+id/button8" />
        <Button
            android:text="9"
            android:layout_weight="1"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:id="@+id/button9" />
    </LinearLayout>
    <LinearLayout
        android:orientation="horizontal"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">
        <Button
            android:text="#"
            android:layout_weight="1"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:id="@+id/buttonhash" />
        <Button
            android:text="0"
            android:layout_weight="1"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:id="@+id/button0" />
        <Button
            android:text="+"
            android:layout_weight="1"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:id="@+id/buttonplus" />
    </LinearLayout>
</LinearLayout>

Dear Cheesebaron,
At first i want to honestly thank you for your support in general.

The above example is pretty easy and straight forward.
When the CallActivity is started is smoothly overlap the default dialer screen.
My issue is that i cant hear the dial tone, because basically is just showing a new dial screen and not actually make a call to a number.

Thanks in advance.