diff --git a/rro_overlays/mtk-ims-telephony/res/values/config.xml b/rro_overlays/mtk-ims-telephony/res/values/config.xml
index 2e4a86b..6d21d08 100644
--- a/rro_overlays/mtk-ims-telephony/res/values/config.xml
+++ b/rro_overlays/mtk-ims-telephony/res/values/config.xml
@@ -2,4 +2,11 @@
 <resources>
 	<string name="config_ims_mmtel_package" translatable="false">com.mediatek.ims</string>
 	<string name="config_ims_rcs_package" translatable="false">com.android.service.ims</string>
+
+        <!-- Flag indicating whether the device supports RTT (real-time text) -->
+        <bool name="config_support_rtt">true</bool>
+
+        <!-- Whether the device supports dialing emergency RTT calls when there's no SIM card installed
+        -->
+        <bool name="config_support_simless_emergency_rtt">true</bool>
 </resources>