diff --git a/radio/1.6/IRadioResponse.hal b/radio/1.6/IRadioResponse.hal
index 36e3ee4..29b8e9d 100644
--- a/radio/1.6/IRadioResponse.hal
+++ b/radio/1.6/IRadioResponse.hal
@@ -19,6 +19,7 @@
 import @1.0::SendSmsResult;
 import @1.6::RadioResponseInfo;
 import @1.5::IRadioResponse;
+import @1.6::RegStateResult;
 import @1.6::SetupDataCallResult;
 
 /**
@@ -327,4 +328,31 @@
      *   RadioError:INVALID_ARGUMENTS
      */
     oneway getSystemSelectionChannelsResponse(RadioResponseInfo info);
+
+    /**
+     * @param info Response info struct containing response type, serial no. and error
+     * @param voiceRegResponse Current Voice registration response as defined by RegStateResult
+     *        in types.hal
+     *
+     * Valid errors returned:
+     *   RadioError:NONE
+     *   RadioError:RADIO_NOT_AVAILABLE
+     *   RadioError:INTERNAL_ERR
+     */
+    oneway getVoiceRegistrationStateResponse_1_6(RadioResponseInfo info,
+            RegStateResult voiceRegResponse);
+
+    /**
+     * @param info Response info struct containing response type, serial no. and error
+     * @param dataRegResponse Current Data registration response as defined by RegStateResult in
+     *        types.hal
+     *
+     * Valid errors returned:
+     *   RadioError:NONE
+     *   RadioError:RADIO_NOT_AVAILABLE
+     *   RadioError:INTERNAL_ERR
+     *   RadioError:NOT_PROVISIONED
+     */
+    oneway getDataRegistrationStateResponse_1_6(RadioResponseInfo info,
+            RegStateResult dataRegResponse);
 };