Thats true... you need to restrict port 5060 to the subnet from your provider to get rid of this attacks.You have identified the ports but it shows all ip's. This is not an improvement. You need too restrict the allowed IP to you trunk provider(s).
This would be the best solution in this situation.You need to be on Hosted by 3CX - clearly you dont have the experience to run a PBX on the cloud.
For what... doesnt matter where this ips are from.have you tried a 'who is' lookup on those IP's?
- yeah, - I was curious enough to have a look just now... - finding Who is actually there might be a challenging job.....For what... doesnt matter where this ips are from.
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