alert udp $EXTERNAL_NET any -> $HOME_NET 5060 (msg:"ET VOIP MultiTech SIP UDP Overflow"; content:"INVITE"; nocase; depth:6; isdataat:65,relative; content:!"|0a|"; within:61; reference:cve,2005-4050; classtype:attempted-user; sid:2003237; rev:8; metadata:created_at 2010_07_30, confidence Medium, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;)