init

overlay/TelephonyResOverlay/Android.bp

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+//
+// Copyright (C) 2022 The LineageOS Project
+// SPDX-License-Identifier: Apache-2.0
+//
+
+runtime_resource_overlay {
+    name: "TelephonyResOverlay",
+    vendor: true,
+}

overlay/TelephonyResOverlay/AndroidManifest.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<!--
+     Copyright (C) 2022 The LineageOS Project
+     SPDX-License-Identifier: Apache-2.0
+-->
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="com.android.phone.overlay">
+
+    <overlay
+        android:isStatic="true"
+        android:priority="1"
+        android:targetPackage="com.android.phone" />
+</manifest>

overlay/TelephonyResOverlay/res/values/config.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<!--
+     Copyright (C) 2022 The Linux Foundation
+     SPDX-License-Identifier: BSD-3-Clause
+-->
+<resources>
+    <!-- String indicating the package name of the device ImsService implementation for MMTEL. -->
+    <string name="config_ims_mmtel_package">com.mediatek.ims</string>
+
+    <!-- String indicating the package name of the device ImsService implementation for RCS. -->
+    <string name="config_ims_rcs_package">com.mediatek.ims</string>
+</resources>