diff --git a/include/telephony/ril.h b/include/telephony/ril.h
index 530449e..ccc40d9 100644
--- a/include/telephony/ril.h
+++ b/include/telephony/ril.h
@@ -101,7 +101,21 @@
     RIL_E_ILLEGAL_SIM_OR_ME = 15,               /* network selection failed due to
                                                    illegal SIM or ME */
     RIL_E_MISSING_RESOURCE = 16,                /* no logical channel available */
-    RIL_E_NO_SUCH_ELEMENT = 17,                 /* application not found on SIM */
+    RIL_E_NO_SUCH_ELEMENT = 17,                  /* application not found on SIM */
+    RIL_E_DIAL_MODIFIED_TO_USSD = 18,           /* DIAL request modified to USSD */
+    RIL_E_DIAL_MODIFIED_TO_SS = 19,             /* DIAL request modified to SS */
+    RIL_E_DIAL_MODIFIED_TO_DIAL = 20,           /* DIAL request modified to DIAL with different
+                                                   data */
+    RIL_E_USSD_MODIFIED_TO_DIAL = 21,           /* USSD request modified to DIAL */
+    RIL_E_USSD_MODIFIED_TO_SS = 22,             /* USSD request modified to SS */
+    RIL_E_USSD_MODIFIED_TO_USSD = 23,           /* USSD request modified to different USSD
+                                                   request */
+    RIL_E_SS_MODIFIED_TO_DIAL = 24,             /* SS request modified to DIAL */
+    RIL_E_SS_MODIFIED_TO_USSD = 25,             /* SS request modified to USSD */
+    RIL_E_SUBSCRIPTION_NOT_SUPPORTED = 26,      /* Subscription not supported by RIL */
+    RIL_E_SS_MODIFIED_TO_SS = 27                /* SS request modified to different SS request */
+
+
 } RIL_Errno;
 
 typedef enum {
@@ -526,6 +540,9 @@
     CALL_FAIL_FDN_BLOCKED = 241,
     CALL_FAIL_IMSI_UNKNOWN_IN_VLR = 242,
     CALL_FAIL_IMEI_NOT_ACCEPTED = 243,
+    CALL_FAIL_DIAL_MODIFIED_TO_USSD = 244, /* STK Call Control */
+    CALL_FAIL_DIAL_MODIFIED_TO_SS = 245,
+    CALL_FAIL_DIAL_MODIFIED_TO_DIAL = 246,
     CALL_FAIL_CDMA_LOCKED_UNTIL_POWER_CYCLE = 1000,
     CALL_FAIL_CDMA_DROP = 1001,
     CALL_FAIL_CDMA_INTERCEPT = 1002,
@@ -1208,6 +1225,80 @@
   } cfg;
 } RIL_HardwareConfig;
 
+typedef enum {
+  SS_CFU,
+  SS_CF_BUSY,
+  SS_CF_NO_REPLY,
+  SS_CF_NOT_REACHABLE,
+  SS_CF_ALL,
+  SS_CF_ALL_CONDITIONAL,
+  SS_CLIP,
+  SS_CLIR,
+  SS_COLP,
+  SS_COLR,
+  SS_WAIT,
+  SS_BAOC,
+  SS_BAOIC,
+  SS_BAOIC_EXC_HOME,
+  SS_BAIC,
+  SS_BAIC_ROAMING,
+  SS_ALL_BARRING,
+  SS_OUTGOING_BARRING,
+  SS_INCOMING_BARRING
+} RIL_SsServiceType;
+
+typedef enum {
+  SS_ACTIVATION,
+  SS_DEACTIVATION,
+  SS_INTERROGATION,
+  SS_REGISTRATION,
+  SS_ERASURE
+} RIL_SsRequestType;
+
+typedef enum {
+  SS_ALL_TELE_AND_BEARER_SERVICES,
+  SS_ALL_TELESEVICES,
+  SS_TELEPHONY,
+  SS_ALL_DATA_TELESERVICES,
+  SS_SMS_SERVICES,
+  SS_ALL_TELESERVICES_EXCEPT_SMS
+} RIL_SsTeleserviceType;
+
+#define SS_INFO_MAX 4
+#define NUM_SERVICE_CLASSES 7
+
+typedef struct {
+  int numValidIndexes; /* This gives the number of valid values in cfInfo.
+                       For example if voice is forwarded to one number and data
+                       is forwarded to a different one then numValidIndexes will be
+                       2 indicating total number of valid values in cfInfo.
+                       Similarly if all the services are forwarded to the same
+                       number then the value of numValidIndexes will be 1. */
+
+  RIL_CallForwardInfo cfInfo[NUM_SERVICE_CLASSES]; /* This is the response data
+                                                      for SS request to query call
+                                                      forward status. see
+                                                      RIL_REQUEST_QUERY_CALL_FORWARD_STATUS */
+} RIL_CfData;
+
+typedef struct {
+  RIL_SsServiceType serviceType;
+  RIL_SsRequestType requestType;
+  RIL_SsTeleserviceType teleserviceType;
+  int serviceClass;
+  RIL_Errno result;
+
+  union {
+    int ssInfo[SS_INFO_MAX]; /* This is the response data for most of the SS GET/SET
+                                RIL requests. E.g. RIL_REQUSET_GET_CLIR returns
+                                two ints, so first two values of ssInfo[] will be
+                                used for response if serviceType is SS_CLIR and
+                                requestType is SS_INTERROGATION */
+
+    RIL_CfData cfData;
+  };
+} RIL_StkCcUnsolSsResponse;
+
 /**
  * Data connection power state
  */
@@ -1297,7 +1388,6 @@
 
 #define RIL_REQUEST_ENTER_SIM_PIN 2
 
-
 /**
  * RIL_REQUEST_ENTER_SIM_PUK
  *
@@ -1475,6 +1565,9 @@
  * Valid errors:
  *  SUCCESS
  *  RADIO_NOT_AVAILABLE (radio resetting)
+ *  DIAL_MODIFIED_TO_USSD
+ *  DIAL_MODIFIED_TO_SS
+ *  DIAL_MODIFIED_TO_DIAL
  *  GENERIC_FAILURE
  */
 #define RIL_REQUEST_DIAL 10
@@ -2078,6 +2171,9 @@
  *  SUCCESS
  *  RADIO_NOT_AVAILABLE
  *  FDN_CHECK_FAILURE
+ *  USSD_MODIFIED_TO_DIAL
+ *  USSD_MODIFIED_TO_SS
+ *  USSD_MODIFIED_TO_USSD
  *  GENERIC_FAILURE
  *
  * See also: RIL_REQUEST_CANCEL_USSD, RIL_UNSOL_ON_USSD
@@ -2113,6 +2209,9 @@
  * Valid errors:
  *  SUCCESS
  *  RADIO_NOT_AVAILABLE
+ *  SS_MODIFIED_TO_DIAL
+ *  SS_MODIFIED_TO_USSD
+ *  SS_MODIFIED_TO_SS
  *  GENERIC_FAILURE
  */
 #define RIL_REQUEST_GET_CLIR 31
@@ -2128,6 +2227,9 @@
  * Valid errors:
  *  SUCCESS
  *  RADIO_NOT_AVAILABLE
+ *  SS_MODIFIED_TO_DIAL
+ *  SS_MODIFIED_TO_USSD
+ *  SS_MODIFIED_TO_SS
  *  GENERIC_FAILURE
  */
 #define RIL_REQUEST_SET_CLIR 32
@@ -2151,6 +2253,9 @@
  * Valid errors:
  *  SUCCESS
  *  RADIO_NOT_AVAILABLE
+ *  SS_MODIFIED_TO_DIAL
+ *  SS_MODIFIED_TO_USSD
+ *  SS_MODIFIED_TO_SS
  *  GENERIC_FAILURE
  */
 #define RIL_REQUEST_QUERY_CALL_FORWARD_STATUS 33
@@ -2167,6 +2272,9 @@
  * Valid errors:
  *  SUCCESS
  *  RADIO_NOT_AVAILABLE
+ *  SS_MODIFIED_TO_DIAL
+ *  SS_MODIFIED_TO_USSD
+ *  SS_MODIFIED_TO_SS
  *  GENERIC_FAILURE
  */
 #define RIL_REQUEST_SET_CALL_FORWARD 34
@@ -2193,6 +2301,9 @@
  * Valid errors:
  *  SUCCESS
  *  RADIO_NOT_AVAILABLE
+ *  SS_MODIFIED_TO_DIAL
+ *  SS_MODIFIED_TO_USSD
+ *  SS_MODIFIED_TO_SS
  *  GENERIC_FAILURE
  */
 #define RIL_REQUEST_QUERY_CALL_WAITING 35
@@ -2212,6 +2323,9 @@
  * Valid errors:
  *  SUCCESS
  *  RADIO_NOT_AVAILABLE
+ *  SS_MODIFIED_TO_DIAL
+ *  SS_MODIFIED_TO_USSD
+ *  SS_MODIFIED_TO_SS
  *  GENERIC_FAILURE
  */
 #define RIL_REQUEST_SET_CALL_WAITING 36
@@ -2354,6 +2468,9 @@
  * Valid errors:
  *  SUCCESS
  *  RADIO_NOT_AVAILABLE
+ *  SS_MODIFIED_TO_DIAL
+ *  SS_MODIFIED_TO_USSD
+ *  SS_MODIFIED_TO_SS
  *  GENERIC_FAILURE
  *
  */
@@ -2383,6 +2500,9 @@
  * Valid errors:
  *  SUCCESS
  *  RADIO_NOT_AVAILABLE
+ *  SS_MODIFIED_TO_DIAL
+ *  SS_MODIFIED_TO_USSD
+ *  SS_MODIFIED_TO_SS
  *  GENERIC_FAILURE
  *
  */
@@ -2405,6 +2525,9 @@
  * Valid errors:
  *  SUCCESS
  *  RADIO_NOT_AVAILABLE
+ *  SS_MODIFIED_TO_DIAL
+ *  SS_MODIFIED_TO_USSD
+ *  SS_MODIFIED_TO_SS
  *  GENERIC_FAILURE
  *
  */
@@ -2625,6 +2748,9 @@
  * Valid errors:
  *  SUCCESS
  *  RADIO_NOT_AVAILABLE (radio resetting)
+ *  SS_MODIFIED_TO_DIAL
+ *  SS_MODIFIED_TO_USSD
+ *  SS_MODIFIED_TO_SS
  *  GENERIC_FAILURE
  */
 
@@ -4322,7 +4448,6 @@
  */
 #define RIL_UNSOL_ON_USSD_REQUEST 1007
 
-
 /**
  * RIL_UNSOL_NITZ_TIME_RECEIVED
  *
@@ -4754,8 +4879,30 @@
  */
 #define RIL_UNSOL_RADIO_CAPABILITY 1042
 
+/*
+ * RIL_UNSOL_ON_SS
+ *
+ * Called when SS response is received when DIAL/USSD/SS is changed to SS by
+ * call control.
+ *
+ * "data" is const RIL_StkCcUnsolSsResponse *
+ *
+ */
+#define RIL_UNSOL_ON_SS 1043
+
+/**
+ * RIL_UNSOL_STK_CC_ALPHA_NOTIFY
+ *
+ * Called when there is an ALPHA from UICC during Call Control.
+ *
+ * "data" is const char * containing ALPHA string from UICC in UTF-8 format.
+ *
+ */
+#define RIL_UNSOL_STK_CC_ALPHA_NOTIFY 1044
+
 /***********************************************************************/
 
+
 #if defined(ANDROID_MULTI_SIM)
 /**
  * RIL_Request Function pointer
diff --git a/libril/ril.cpp b/libril/ril.cpp
index 41d11a8..0f244c3 100644
--- a/libril/ril.cpp
+++ b/libril/ril.cpp
@@ -305,10 +305,14 @@
 static int responseHardwareConfig(Parcel &p, void *response, size_t responselen);
 static int responseDcRtInfo(Parcel &p, void *response, size_t responselen);
 static int responseRadioCapability(Parcel &p, void *response, size_t responselen);
+static int responseSSData(Parcel &p, void *response, size_t responselen);
+
 static int decodeVoiceRadioTechnology (RIL_RadioState radioState);
 static int decodeCdmaSubscriptionSource (RIL_RadioState radioState);
 static RIL_RadioState processRadioState(RIL_RadioState newRadioState);
 
+static bool isServiceTypeCfQuery(RIL_SsServiceType serType, RIL_SsRequestType reqType);
+
 #ifdef RIL_SHLIB
 #if defined(ANDROID_MULTI_SIM)
 extern "C" void RIL_onUnsolicitedResponse(int unsolResponse, void *data,
@@ -3236,6 +3240,84 @@
     return 0;
 }
 
+static int responseSSData(Parcel &p, void *response, size_t responselen) {
+    RLOGD("In responseSSData");
+    int num;
+
+    if (response == NULL && responselen != 0) {
+        RLOGE("invalid response length was %d expected %d",
+                (int)responselen, (int)sizeof (RIL_SIM_IO_Response));
+        return RIL_ERRNO_INVALID_RESPONSE;
+    }
+
+    if (responselen != sizeof(RIL_StkCcUnsolSsResponse)) {
+        RLOGE("invalid response length %d, expected %d",
+               (int)responselen, (int)sizeof(RIL_StkCcUnsolSsResponse));
+        return RIL_ERRNO_INVALID_RESPONSE;
+    }
+
+    startResponse;
+    RIL_StkCcUnsolSsResponse *p_cur = (RIL_StkCcUnsolSsResponse *) response;
+    p.writeInt32(p_cur->serviceType);
+    p.writeInt32(p_cur->requestType);
+    p.writeInt32(p_cur->teleserviceType);
+    p.writeInt32(p_cur->serviceClass);
+    p.writeInt32(p_cur->result);
+
+    if (isServiceTypeCfQuery(p_cur->serviceType, p_cur->requestType)) {
+        RLOGD("responseSSData CF type, num of Cf elements %d", p_cur->cfData.numValidIndexes);
+        if (p_cur->cfData.numValidIndexes > NUM_SERVICE_CLASSES) {
+            RLOGE("numValidIndexes is greater than max value %d, "
+                  "truncating it to max value", NUM_SERVICE_CLASSES);
+            p_cur->cfData.numValidIndexes = NUM_SERVICE_CLASSES;
+        }
+        /* number of call info's */
+        p.writeInt32(p_cur->cfData.numValidIndexes);
+
+        for (int i = 0; i < p_cur->cfData.numValidIndexes; i++) {
+             RIL_CallForwardInfo cf = p_cur->cfData.cfInfo[i];
+
+             p.writeInt32(cf.status);
+             p.writeInt32(cf.reason);
+             p.writeInt32(cf.serviceClass);
+             p.writeInt32(cf.toa);
+             writeStringToParcel(p, cf.number);
+             p.writeInt32(cf.timeSeconds);
+             appendPrintBuf("%s[%s,reason=%d,cls=%d,toa=%d,%s,tout=%d],", printBuf,
+                 (cf.status==1)?"enable":"disable", cf.reason, cf.serviceClass, cf.toa,
+                  (char*)cf.number, cf.timeSeconds);
+             RLOGD("Data: %d,reason=%d,cls=%d,toa=%d,num=%s,tout=%d],", cf.status,
+                  cf.reason, cf.serviceClass, cf.toa, (char*)cf.number, cf.timeSeconds);
+        }
+    } else {
+        p.writeInt32 (SS_INFO_MAX);
+
+        /* each int*/
+        for (int i = 0; i < SS_INFO_MAX; i++) {
+             appendPrintBuf("%s%d,", printBuf, p_cur->ssInfo[i]);
+             RLOGD("Data: %d",p_cur->ssInfo[i]);
+             p.writeInt32(p_cur->ssInfo[i]);
+        }
+    }
+    removeLastChar;
+    closeResponse;
+
+    return 0;
+}
+
+static bool isServiceTypeCfQuery(RIL_SsServiceType serType, RIL_SsRequestType reqType) {
+    if ((reqType == SS_INTERROGATION) &&
+        (serType == SS_CFU ||
+         serType == SS_CF_BUSY ||
+         serType == SS_CF_NO_REPLY ||
+         serType == SS_CF_NOT_REACHABLE ||
+         serType == SS_CF_ALL ||
+         serType == SS_CF_ALL_CONDITIONAL)) {
+        return true;
+    }
+    return false;
+}
+
 static void triggerEvLoop() {
     int ret;
     if (!pthread_equal(pthread_self(), s_tid_dispatch)) {
diff --git a/libril/ril_unsol_commands.h b/libril/ril_unsol_commands.h
old mode 100644
new mode 100755
index 7cd41da..6ea7157
--- a/libril/ril_unsol_commands.h
+++ b/libril/ril_unsol_commands.h
@@ -57,3 +57,5 @@
     {RIL_UNSOL_HARDWARE_CONFIG_CHANGED, responseHardwareConfig, WAKE_PARTIAL},
     {RIL_UNSOL_DC_RT_INFO_CHANGED, responseDcRtInfo, WAKE_PARTIAL},
     {RIL_UNSOL_RADIO_CAPABILITY, responseRadioCapability, WAKE_PARTIAL},
+    {RIL_UNSOL_ON_SS, responseSSData, WAKE_PARTIAL},
+    {RIL_UNSOL_STK_CC_ALPHA_NOTIFY, responseString, WAKE_PARTIAL},