rem: if ((tests & NAT_UAC_TEST_C_1918) && contact_1918(msg))
add: if ((tests & NAT_UAC_TEST_C_1918) && (contact_1918(msg)>0))
context: nat_uac_test_f(struct sip_msg* msg, char* str1, char* str2){	int tests;	tests = (int)(long)str1;	/* return true if any of the NAT-UAC tests holds */	/*	 * test if source address of signaling is different from	 * address advertised in Via	 */	if ((tests & NAT_UAC_TEST_RCVD) && received_test(msg))		return 1;	/*	 * test for occurences of RFC1918 addresses in Contact	 * header field	 */	if ((tests & NAT_UAC_TEST_C_1918) && contact_1918(msg))		return 1;	/*	 * test for occurences of RFC1918 addresses in SDP body	 */	if ((tests & NAT_UAC_TEST_S_1918) && sdp_1918(msg))		return 1;	/*	 * test for occurences of RFC1918 addresses top Via	 */	if ((tests & NAT_UAC_TEST_V_1918) && via_1918(msg))		return 1;	/* no test succeeded */	return -1;}