Add defines for Extended Audio Gateway Error Result Codes

This is needed for the mandatory "Phone status information"
feature of HFP.

audio/telephony.h

@@ -64,6 +64,31 @@
 #define EV_ROAM_INACTIVE		0
 #define EV_ROAM_ACTIVE			1
 
+/* Extended Audio Gateway Error Result Codes */
+#define CME_ERROR_NONE			-1
+#define CME_ERROR_AG_FAILURE		0
+#define CME_ERROR_NO_PHONE_CONNECTION	1
+#define CME_ERROR_NOT_ALLOWED		3
+#define CME_ERROR_NOT_SUPPORTED		4
+#define CME_ERROR_PH_SIM_PIN_REQUIRED	5
+#define CME_ERROR_SIM_NOT_INSERTED	10
+#define CME_ERROR_SIM_PIN_REQUIRED	11
+#define CME_ERROR_SIM_PUK_REQUIRED	12
+#define CME_ERROR_SIM_FAILURE		13
+#define CME_ERROR_SIM_BUSY		14
+#define CME_ERROR_INCORRECT_PASSWORD	16
+#define CME_ERROR_SIM_PIN2_REQUIRED	17
+#define CME_ERROR_SIM_PUK2_REQUIRED	18
+#define CME_ERROR_MEMORY_FULL		20
+#define CME_ERROR_INVALID_INDEX		21
+#define CME_ERROR_MEMORY_FAILURE	23
+#define CME_ERROR_TEXT_STRING_TOO_LONG	24
+#define CME_ERROR_INVALID_TEXT_STRING	25
+#define CME_ERROR_DIAL_STRING_TOO_LONG	26
+#define CME_ERROR_INVALID_DIAL_STRING	27
+#define CME_ERROR_NO_NETWORK_SERVICE	30
+#define CME_ERROR_NETWORK_NOT_ALLOWED	32
+
 struct indicator {
 	const char *desc;
 	const char *range;