Protect your Asterisk PBX server from Black listed IP address
VoIPBL is a distributed VoIP blacklist that is aimed to protects against VoIP Fraud and minimizing abuse for network that have publicly accessible PBX’s.
For more details http://www.voipbl.org/
For Asterisk PBX you need to install Fail2ban. This is the only required dependency needed to run VoIP Blacklist on your server.