diff --git a/ril/include/telephony/ril.h b/ril/include/telephony/ril.h
index 1ccb519..9c935aa 100644
--- a/ril/include/telephony/ril.h
+++ b/ril/include/telephony/ril.h
@@ -421,7 +421,10 @@ typedef struct {
 
 typedef struct {
     RIL_CallState   state;
-    int             index;      /* Connection Index for use with, eg, AT+CHLD */
+    unsigned char   index;      /* Connection Index for use with, eg, AT+CHLD */
+    unsigned char   call_id;    /* Samsung field */
+    unsigned char   pad;        /* Unsigned gap padding */
+    char            pad1;       /* Signed gap padding */
     int             toa;        /* type of address, eg 145 = intl */
     char            isMpty;     /* nonzero if is mpty call */
     char            isMT;       /* nonzero if call is mobile terminated */