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Howto setup Asterisk behind NAT
This HOWTO assumes that your FreePBX system is sitting behind a NATed firewall with no direct connection to the outside world and it is NOT in the DMZ zone. If you have your system facing outside, or have used Mapped IP addresses or other techniques, then it is assumed that you have adequate knowledge to […]
Fix Asterisk 1 way Audio Issues
NAT issues Perhaps the most common problem encountered is one-way audio, and 99% of the time, this is caused by a NAT firewall. So here are the steps you must take to configure the PBX to work behind a NAT firewall. Make sure you have a resolvable address on the Internet. If you don’t want […]
Securing Asterisk IP-PBX with Fail2Ban
What is Fail2Ban? Any service that is exposed to the internet is susceptible to attacks from malicious parties. If your service requires authentication, illegitimate users and bots will attempt to break into your system by repeatedly trying to authenticate using different credentials. A common example of this is with SSH, which will be the subject […]