I’m running my first FreePBX and it’s be wonderfully saving me money compared to the landline from Virgin Media.
One issue I seem to have is when looking at the Dashboard page, it shows calls many calls which I have not made. I keep a careful eye on the balance / call history in my SIP account and so I know that none of these have been successful so far but wondering if anyone can help me sure up my firewall settings to I can get rid of these attempted calls. Sometimes there are one or two but on several occasions I have seen that number jump to 50-90+ calls where I guess the nasty person is attempting to brute force / cause an overflow buffer type exception.
I have my PBX running on stand alone hardware with the Firewall and Fail2Ban modules enabled. I have a good router with a firewall enabled which I think is correct.
When I “nmap -sU” the FreePBX host inside my network it takes an age to respond but eventually returns the results including port 5060 for sip (although is does say this is filtered). When I “nmap -sU” against my external IP then I just get a single result “520/udp closed route”