alert udp $EXTERNAL_NET any -> $HOME_NET 5060 (msg:"ET SCAN Sipp SIP Stress Test Detected"; content:"sip|3a|sipp@"; content:"Subject|3a| Performance Test"; offset:90; depth:90; threshold:type threshold, track by_dst, count 20, seconds 15; reference:url,sourceforge.net/projects/sipp/; classtype:attempted-recon; sid:2008579; rev:4; metadata:created_at 2010_07_30, confidence Medium, signature_severity Informational, updated_at 2019_07_26;)