diff --git a/configs/privapp-permissions-com.mediatek.ims.xml b/configs/privapp-permissions-com.mediatek.ims.xml
new file mode 100644
index 0000000..fe93e61
--- /dev/null
+++ b/configs/privapp-permissions-com.mediatek.ims.xml
@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="utf-8"?>
+<permissions>
+    <privapp-permissions package="com.mediatek.ims">
+        <permission name="android.permission.READ_PRECISE_PHONE_STATE"/>
+        <permission name="android.permission.PACKET_KEEPALIVE_OFFLOAD"/>
+        <permission name="android.permission.CHANGE_WIFI_STATE"/>
+        <permission name="android.permission.NETWORK_SIGNAL_STRENGTH_WAKEUP"/>
+        <permission name="android.permission.MODIFY_PHONE_STATE"/>
+        <permission name="android.permission.UPDATE_DEVICE_STATS"/>
+        <permission name="android.permission.READ_PRIVILEGED_PHONE_STATE"/>
+        <permission name="android.permission.LOCATION_BYPASS"/>
+    </privapp-permissions>
+</permissions>
diff --git a/configs/properties/system.prop b/configs/properties/system.prop
index 37becf3..b68fbca 100644
--- a/configs/properties/system.prop
+++ b/configs/properties/system.prop
@@ -1,2 +1,7 @@
 # Charger
 ro.charger.enable_suspend=true
+
+# IMS
+persist.dbg.volte_avail_ovr=1
+persist.dbg.vt_avail_ovr=1
+persist.dbg.wfc_avail_ovr=1
diff --git a/device.mk b/device.mk
index 72002f8..ad72406 100644
--- a/device.mk
+++ b/device.mk
@@ -140,6 +140,19 @@ PRODUCT_PACKAGES += \
     libhidltransport.vendor \
     libhwbinder.vendor
 
+# IMS
+PRODUCT_BOOT_JARS += \
+    mediatek-common \
+    mediatek-framework \
+    mediatek-ims-base \
+    mediatek-ims-common \
+    mediatek-telecom-common \
+    mediatek-telephony-base \
+    mediatek-telephony-common
+
+PRODUCT_COPY_FILES += \
+    $(LOCAL_PATH)/configs/privapp-permissions-com.mediatek.ims.xml:$(TARGET_COPY_OUT_SYSTEM)/etc/permissions/privapp-permissions-com.mediatek.ims.xml
+
 # Init files
 PRODUCT_PACKAGES += \
     fstab.mt6789 \
@@ -216,7 +229,8 @@ PRODUCT_COPY_FILES += \
 # Overlays
 PRODUCT_PACKAGES += \
 	FrameworksResOverlay \
-	SettingsResOverlay
+	SettingsResOverlay \
+	TelephonyOverlay
 
 # Permissions
 PRODUCT_COPY_FILES += \
diff --git a/overlay/FrameworksResOverlay/res/values/config.xml b/overlay/FrameworksResOverlay/res/values/config.xml
index fb4ee69..fe110f7 100644
--- a/overlay/FrameworksResOverlay/res/values/config.xml
+++ b/overlay/FrameworksResOverlay/res/values/config.xml
@@ -308,4 +308,30 @@
 
     <!-- Whether device supports double tap to wake -->
     <bool name="config_supportDoubleTapWake">true</bool>
+
+    <!-- Boolean indicating USSD over IMS is allowed.
+     If it is not supported due to modem limitations, USSD send over the CS pipe instead.-->
+    <bool name="config_allow_ussd_over_ims">true</bool>
+
+    <!-- Flag specifying whether WFC over IMS is available on device -->
+    <bool name="config_device_wfc_ims_available">true</bool>
+
+    <!-- Flag specifying whether WFC over IMS should be available for carrier: independent of
+         carrier provisioning. If false: hard disabled. If true: then depends on carrier
+         provisioning, availability etc -->
+    <bool name="config_carrier_wfc_ims_available">true</bool>
+
+    <!-- Flag specifying whether VoLTE is available on device -->
+    <bool name="config_device_volte_available">true</bool>
+
+    <!-- Flag specifying whether VoLTE should be available for carrier: independent of
+         carrier provisioning. If false: hard disabled. If true: then depends on carrier
+         provisioning, availability etc -->
+    <bool name="config_carrier_volte_available">true</bool>
+
+    <!-- Flag specifying whether VoLTE TTY is supported -->
+    <bool name="config_carrier_volte_tty_supported">true</bool>
+
+    <!-- Flag specifying whether VT is available on device -->
+    <bool name="config_device_vt_available">true</bool>
 </resources>
diff --git a/overlay/TelephonyOverlay/Android.bp b/overlay/TelephonyOverlay/Android.bp
new file mode 100644
index 0000000..89a8cde
--- /dev/null
+++ b/overlay/TelephonyOverlay/Android.bp
@@ -0,0 +1,12 @@
+//
+// Copyright (C) 2023 The LineageOS Project
+//
+// SPDX-License-Identifier: Apache-2.0
+//
+
+runtime_resource_overlay {
+    name: "TelephonyOverlay",
+    sdk_version: "current",
+    product_specific: true,
+    resource_dirs: ["res"]
+}
diff --git a/overlay/TelephonyOverlay/AndroidManifest.xml b/overlay/TelephonyOverlay/AndroidManifest.xml
new file mode 100644
index 0000000..d9b7a43
--- /dev/null
+++ b/overlay/TelephonyOverlay/AndroidManifest.xml
@@ -0,0 +1,14 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  Copyright (C) 2023 The LineageOS Project
+  SPDX-License-Identifier: Apache-2.0
+-->
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="com.android.telephony.overlay">
+
+    <application android:hasCode="false" />
+    <overlay
+      android:targetPackage="com.android.phone"
+      android:isStatic="true"
+      android:priority="1"/>
+</manifest>
diff --git a/overlay/TelephonyOverlay/res/values/config.xml b/overlay/TelephonyOverlay/res/values/config.xml
new file mode 100644
index 0000000..1f95aa7
--- /dev/null
+++ b/overlay/TelephonyOverlay/res/values/config.xml
@@ -0,0 +1,27 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (C) 2009 The Android Open Source Project
+     Licensed under the Apache License, Version 2.0 (the "License");
+     you may not use this file except in compliance with the License.
+     You may obtain a copy of the License at
+          http://www.apache.org/licenses/LICENSE-2.0
+     Unless required by applicable law or agreed to in writing, software
+     distributed under the License is distributed on an "AS IS" BASIS,
+     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+     See the License for the specific language governing permissions and
+     limitations under the License.
+-->
+
+<!-- NOTE: Many variables that used to be in this file have been migrated to
+     CarrierConfigManager.java. Please consider whether new variables belong
+     there before adding to this file. Variables here should be more closely
+     related to devices than to networks. -->
+
+<!-- Phone app resources that may need to be customized
+     for different hardware or product builds. -->
+<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>
diff --git a/proprietary-files.txt b/proprietary-files.txt
index 6cb30ac..b812542 100644
--- a/proprietary-files.txt
+++ b/proprietary-files.txt
@@ -693,6 +693,37 @@ vendor/lib64/mt6789/libmnl.so
 vendor/lib64/librpc.so
 vendor/lib64/libviagpsrpc.so
 
+# IMS
+bin/vtservice
+etc/init/init.vtservice.rc
+framework/mediatek-common.jar
+framework/mediatek-framework.jar
+framework/mediatek-ims-base.jar
+framework/mediatek-ims-common.jar
+framework/mediatek-ims-extension-plugin.jar
+framework/mediatek-telecom-common.jar
+framework/mediatek-telephony-base.jar
+framework/mediatek-telephony-common.jar
+framework/mediatek-wfo-legacy.jar
+lib64/libcomutils.so
+lib64/libimsma.so
+lib64/libimsma_adapt.so
+lib64/libimsma_rtp.so
+lib64/libimsma_socketwrapper.so
+lib64/libmtk_vt_service.so
+lib64/libmtk_vt_wrapper.so
+lib64/libmtkperf_client.so
+lib64/libsignal.so
+lib64/libsink.so
+lib64/libsource.so
+lib64/libvcodec_cap.so
+lib64/libvcodec_capenc.so
+lib64/libvsim-adaptor-client.so
+lib64/libvt_avsync.so
+priv-app/ImsService/ImsService.apk
+system_ext/lib/vendor.mediatek.hardware.videotelephony@1.0.so
+system_ext/lib64/vendor.mediatek.hardware.videotelephony@1.0.so
+
 # Keymaster
 vendor/bin/hw/vendor.mediatek.hardware.keymaster_attestation@1.1-service
 vendor/bin/kmsetkey_ca.trustonic