diff --git a/src/lynq/lib/liblynq-call/lynq_call.cpp b/src/lynq/lib/liblynq-call/lynq_call.cpp
index 93b1058..f13ac33 100755
--- a/src/lynq/lib/liblynq-call/lynq_call.cpp
+++ b/src/lynq/lib/liblynq-call/lynq_call.cpp
@@ -1189,18 +1189,30 @@
 }
 
 
-int lynq_fast_ecall(int* handle, LYNQ_ECall_Category lynq_ecall_cat, LYNQ_ECall_Variant lynq_ecall_variant,  const char *addr, int addr_length, const char *msd_data, int msd_length)
+int lynq_fast_ecall(int* handle, LYNQ_ECall_Category lynq_ecall_cat, LYNQ_ECall_Variant lynq_ecall_variant,  const char *addr, int addr_length, const unsigned char *msd_data,int msd_length)
 {
     int error = -1;
     int lynq_call_id = -1;
     RIL_ECall_Variant ril_ecall_variant = lynq_get_ril_ecall_variant_from_lynq_variant (lynq_ecall_variant);
     RIL_ECall_Category ril_ecall_cat = lynq_get_ril_ecall_cat_from_lynq_cat(lynq_ecall_cat);
 
+    if(msd_length > MSD_MAX_LENGTH)
+    {
+        LYERRLOG("msd_length %d is greater than %d, parameter error\n",msd_length,MSD_MAX_LENGTH);
+        return -1;
+    }    
+    char* lynq_msd_data[MSD_MAX_LENGTH*2+1]={0};
+
+    for(int i =0; i<msd_length;i++)
+    {
+        sprintf(lynq_msd_data[i<<1],"%02x",msd_data[i]);
+    }    
+
     lynq_call_id = updateAddr(e_call_addr[lynq_ecall_variant]);
 
     LYINFLOG("e_call_addr is %s\n",e_call_addr[lynq_ecall_variant]);
 
-    error=lynq_set_common_request(RIL_REQUEST_ECALL_FAST_MAKE_ECALL,4,"%d %d %s %s",ril_ecall_cat, ril_ecall_variant, "null", msd_data);
+    error=lynq_set_common_request(RIL_REQUEST_ECALL_FAST_MAKE_ECALL,4,"%d %d %s %s",ril_ecall_cat, ril_ecall_variant, "null", lynq_msd_data);
    
     if(error==0)
     {