rem: if (extract_mediaip(&body, &ip, &pf) == -1) {
add: if (extract_mediaip(&body, &ip, &pf,"c=") == -1) {
context: sdp_1918(struct sip_msg* msg){	str body, ip;	int pf;	if (extract_body(msg, &body) == -1) {		LOG(L_ERR,"ERROR: sdp_1918: cannot extract body from msg!\n");		return 0;	}	if (extract_mediaip(&body, &ip, &pf) == -1) {		LOG(L_ERR, "ERROR: sdp_1918: can't extract media IP from the SDP\n");		return 0;	}	if (pf != AF_INET || isnulladdr(&ip, pf))		return 0;	return (is1918addr(&ip) == 1) ? 1 : 0;}