diff --git a/src/stkutil.h b/src/stkutil.h
index 2d98185f..5c755241 100644
--- a/src/stkutil.h
+++ b/src/stkutil.h
@@ -254,6 +254,8 @@ enum stk_result_type {
 	STK_RESULT_TYPE_COMMAND_NOT_UNDERSTOOD =	0x31,
 	STK_RESULT_TYPE_DATA_NOT_UNDERSTOOD =		0x32,
 	STK_RESULT_TYPE_COMMAND_ID_UNKNOWN =		0x33,
+	STK_RESULT_TYPE_SS_RETURN_ERROR =		0x34,
+	STK_RESULT_TYPE_SMS_RP_ERROR =			0x35,
 	STK_RESULT_TYPE_MINIMUM_NOT_MET =		0x36,
 	STK_RESULT_TYPE_USSD_RETURN_ERROR =		0x37,
 	STK_RESULT_TYPE_CALL_CONTROL_PERMANENT =	0x39,
@@ -263,6 +265,26 @@ enum stk_result_type {
 	STK_RESULT_TYPE_MMS_ERROR =			0x3D,
 };
 
+/* Defined according to TS 102.223 Section 8.12.2 */
+enum stk_result_addnl_me_pb {
+	STK_RESULT_ADDNL_ME_PB_NO_SPECIFIC_CAUSE =	0x00,
+	STK_RESULT_ADDNL_ME_PB_SCREEN_BUSY =		0x01,
+	STK_RESULT_ADDNL_ME_PB_BUSY_ON_CALL =		0x02,
+	STK_RESULT_ADDNL_ME_PB_SS_BUSY =		0x03,
+	STK_RESULT_ADDNL_ME_PB_NO_SERVICE =		0x04,
+	STK_RESULT_ADDNL_ME_PB_NO_ACCESS =		0x05,
+	STK_RESULT_ADDNL_ME_PB_NO_RADIO_RESOURCE =	0x06,
+	STK_RESULT_ADDNL_ME_PB_NOT_IN_SPEECH_CALL =	0x07,
+	STK_RESULT_ADDNL_ME_PB_USSD_BUSY =		0x08,
+	STK_RESULT_ADDNL_ME_PB_BUSY_ON_SEND_DTMF =	0x09,
+	STK_RESULT_ADDNL_ME_PB_NO_NAA_ACTIVE =		0x0A
+};
+
+/* Defined according to TS 31.111 Section 8.12.4 */
+enum stk_result_addnl_ss_pb {
+	STK_RESULT_ADDNL_SS_PB_NO_SPECIFIC_CAUSE =	0x00
+};
+
 enum stk_tone_type {
 	STK_TONE_TYPE_DIAL_TONE =	0x01,
 	STK_TONE_TYPE_BUSY_TONE =	0x02,