diff --git a/radio/1.0/IRadioResponse.hal b/radio/1.0/IRadioResponse.hal
index bf50792..d21bf0b 100644
--- a/radio/1.0/IRadioResponse.hal
+++ b/radio/1.0/IRadioResponse.hal
@@ -280,13 +280,34 @@
 
     /*
      * @param info Response info struct containing response type, serial no. and error
-     * @param failCauseInfo Contains LastCallFailCause and vendor cause code. GSM failure reasons
-     *        are mapped to cause codes defined in TS 24.008 Annex H where possible. CDMA
-     *        failure reasons are derived from the possible call failure scenarios
-     *        described in the "CDMA IS-2000 Release A (C.S0005-A v6.0)" standard.
+     * @param failCauseInfo Contains LastCallFailCause and vendor cause code.
      *
-     * The implementation must return LastCallFailCause:ERROR_UNSPECIFIED for blocked
-     * MO calls by restricted state (See unsolRestrictedStateChanged)
+     *   The vendor cause code must be used for debugging purpose only.
+     *   The implementation must return one of the values of LastCallFailCause
+     *   as mentioned below
+     *
+     *   GSM failure reasons codes for the cause codes defined in TS 24.008 Annex H
+     *   where possible.
+     *   CDMA failure reasons codes for the possible call failure scenarios
+     *   described in the "CDMA IS-2000 Release A (C.S0005-A v6.0)" standard.
+     *   Any of the following reason codes if the call is failed or dropped due to reason
+     *   mentioned with in the braces.
+     *      LastCallFailCause:RADIO_OFF (Radio is OFF)
+     *      LastCallFailCause:OUT_OF_SERVICE (No cell coverage)
+     *      LastCallFailCause:NO_VALID_SIM (No valid SIM)
+     *      LastCallFailCause:RADIO_INTERNAL_ERROR (Modem hit unexpected error scenario)
+     *      LastCallFailCause:NETWORK_RESP_TIMEOUT (No response from network)
+     *      LastCallFailCause:NETWORK_REJECT (Explicit network reject)
+     *      LastCallFailCause:RADIO_ACCESS_FAILURE (RRC connection failure. Eg.RACH)
+     *      LastCallFailCause:RADIO_LINK_FAILURE (Radio Link Failure)
+     *      LastCallFailCause:RADIO_LINK_LOST (Radio link lost due to poor coverage)
+     *      LastCallFailCause:RADIO_UPLINK_FAILURE (Radio uplink failure)
+     *      LastCallFailCause:RADIO_SETUP_FAILURE (RRC connection setup failure)
+     *      LastCallFailCause:RADIO_RELEASE_NORMAL (RRC connection release, normal)
+     *      LastCallFailCause:RADIO_RELEASE_ABNORMAL (RRC connection release, abnormal)
+     *      LastCallFailCause:ACCESS_CLASS_BLOCKED (Access class barring)
+     *      LastCallFailCause:NETWORK_DETACH (Explicit network detach)
+     *   OEM causes (LastCallFailCause:OEM_CAUSE_XX) must be used for debug purpose only
      *
      * If the implementation does not have access to the exact cause codes,
      * then it must return one of the values listed in LastCallFailCause,
diff --git a/radio/1.0/types.hal b/radio/1.0/types.hal
index 9b904a5..ad9f392 100644
--- a/radio/1.0/types.hal
+++ b/radio/1.0/types.hal
@@ -383,6 +383,21 @@
     DIAL_MODIFIED_TO_USSD = 244,          // STK Call Control
     DIAL_MODIFIED_TO_SS = 245,
     DIAL_MODIFIED_TO_DIAL = 246,
+    RADIO_OFF = 247,                      // Radio is OFF
+    OUT_OF_SERVICE = 248,                 // No cellular coverage
+    NO_VALID_SIM = 249,                   // No valid SIM is present
+    RADIO_INTERNAL_ERROR = 250,           // Internal error at Modem
+    NETWORK_RESP_TIMEOUT = 251,           // No response from network
+    NETWORK_REJECT = 252,                 // Explicit network reject
+    RADIO_ACCESS_FAILURE = 253,           // RRC connection failure. Eg.RACH
+    RADIO_LINK_FAILURE = 254,             // Radio Link Failure
+    RADIO_LINK_LOST = 255,                // Radio link lost due to poor coverage
+    RADIO_UPLINK_FAILURE = 256,           // Radio uplink failure
+    RADIO_SETUP_FAILURE = 257,            // RRC connection setup failure
+    RADIO_RELEASE_NORMAL = 258,           // RRC connection release, normal
+    RADIO_RELEASE_ABNORMAL = 259,         // RRC connection release, abnormal
+    ACCESS_CLASS_BLOCKED = 260,           // Access class barring
+    NETWORK_DETACH = 261,                 // Explicit network detach
     CDMA_LOCKED_UNTIL_POWER_CYCLE = 1000,
     CDMA_DROP = 1001,
     CDMA_INTERCEPT = 1002,
@@ -393,10 +408,29 @@
     CDMA_PREEMPTED = 1007,
     CDMA_NOT_EMERGENCY = 1008,            // For non-emergency number dialed during emergency
                                           // callback mode
-    CDMA_ACCESS_BLOCKED = 1009,           // This error will be deprecated soon,
+    CDMA_ACCESS_BLOCKED = 1009,
+
+    /* OEM specific error codes. Used to distinguish error from
+     * CALL_FAIL_ERROR_UNSPECIFIED and help assist debugging */
+    OEM_CAUSE_1 = 0xf001,
+    OEM_CAUSE_2 = 0xf002,
+    OEM_CAUSE_3 = 0xf003,
+    OEM_CAUSE_4 = 0xf004,
+    OEM_CAUSE_5 = 0xf005,
+    OEM_CAUSE_6 = 0xf006,
+    OEM_CAUSE_7 = 0xf007,
+    OEM_CAUSE_8 = 0xf008,
+    OEM_CAUSE_9 = 0xf009,
+    OEM_CAUSE_10 = 0xf00a,
+    OEM_CAUSE_11 = 0xf00b,
+    OEM_CAUSE_12 = 0xf00c,
+    OEM_CAUSE_13 = 0xf00d,
+    OEM_CAUSE_14 = 0xf00e,
+    OEM_CAUSE_15 = 0xf00f,
+
+    ERROR_UNSPECIFIED = 0xffff,           // This error will be deprecated soon,
                                           // vendor code must make sure to map error
                                           // code to specific error
-    ERROR_UNSPECIFIED = 0xffff,
 };
 
 enum DataCallFailCause : int32_t {