I run a personal asterisk/FreePBX with GSM dongle on pi for occasional personal use. The use in mainly for incoming (in a country where i don't have a reliable incoming DID). I have switched port 5060 to non standard port in hope that it will be less vulnerable to attacks. I am a noob when it comes to PBX. Can anyone please let me know if there is any simple method i can use to prevent most attacker. I unfortunately can't restrict it to the IP that I will use to connect personally to PBX. I have sent a good enough passowrd. Are there any simple tools i can use to prevent most (if not all) attacks?
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