alert tcp $EXTERNAL_NET any -> $HOME_NET 1720 (msg:"ET VOIP H.323 in Q.931 Call Setup - Inbound"; flow:established,to_server; content:"|08|"; offset:4; depth:1; byte_jump:1,0,relative; content:"|05 04|"; within:2; byte_jump:1,0,relative; content:"|70|"; byte_jump:1,0,relative; content:"|7E|"; within:1; byte_test:1,!&,0x0F,3,relative; isdataat:31; classtype:misc-activity; sid:2022024; rev:2; metadata:created_at 2015_11_03, confidence Medium, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_03_07;)