Rogue calls on Expressway-E - can they be blocked/dropped

Is there a way to automatically block calls from rogue SIP endpoints trying to dial internal PSTN numbers via the Expressway-E (see attached screenshot)?
Via the firewall protection of the Expressway you can add IP addresses, select UDP port 5060.
But these rogue endpoints change their public addresses all the time - so this list is difficult to maintain.
And Automated protection does not provide a rule for blocking public IP's that are attempting multiple calls to different destinations.
The problem with these calls is they are consuming RMS license because there's a translation rule that translates call to the public IP of the Expressway-E to the local domain. Or should I remove this rule?
Some endpoints use the IP address instead of the DNS name.
rgds ,Geert.

What you're seeing is someone doing remote scans on public facing networks trying to exploit PTSN trunks and attempting to make toll fraud calls.
I'm not sure if you have this option on the Expressway Series, but on VCS you can turn of SIP UDP. You can also use CPL to block the incoming calls as well.
FYI, searching the forums would have returned multiple discussions with solutions.
nuisance-h323-calls-sx20
ghost-calls-tandberg-e20
sourceh323idcisco-incomingcalls
vcs-sip-abuse-reported

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Rogue calls on Expressway-E - can they be blocked/dropped

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