@@ -615,20 +615,22 @@ int pv_get_flag(struct sip_msg *msg, pv_param_t *param,

 	return pv_get_uintval(msg, param, res, (msg->flags & (1<<param->pvn.u.isname.name.n)) ? 1 : 0);

 }

-static inline char* int_to_8hex(int val)

+static inline char* int_to_8hex(int sval)

 {

 	unsigned short digit;

 	int i;

 	static char outbuf[9];

+	unsigned int uval;

+	uval = (unsigned int)sval;

 	outbuf[8] = '\0';

 	for(i=0; i<8; i++)

 	{

-		if(val!=0)

+		if(uval!=0)

 		{

-			digit =  val & 0x0f;

+			digit =  uval & 0x0f;

 			outbuf[7-i] = digit >= 10 ? digit + 'a' - 10 : digit + '0';

-			val >>= 4;

+			uval >>= 4;

 		}

 		else

 			outbuf[7-i] = '0';

@@ -118,7 +118,7 @@ static int pdu_7bit_encode(str sin) {

 	nleft = 1;

 	j = 0;

 	for(i = 0; i < sin.len; i++) {

-		hex = *(sin.s) >> (nleft - 1);

+		hex = (unsigned char)(*(sin.s)) >> (nleft - 1);

 		fill = *(sin.s+1) << (8-nleft);

 		hex = hex | fill;

 		_tr_buffer[j++] = HexTbl[hex >> 4];

@@ -292,7 +292,7 @@ int tr_eval_string(struct sip_msg *msg, tr_param_t *tp, int subtype,

 			j = 0;

 			for(i=0; i<val->rs.len; i++)

 			{

-				_tr_buffer[j++] = fourbits2char[val->rs.s[i] >> 4];

+				_tr_buffer[j++] = fourbits2char[(unsigned char)val->rs.s[i] >> 4];

 				_tr_buffer[j++] = fourbits2char[val->rs.s[i] & 0xf];

 			}

 			_tr_buffer[j] = '\0';