Hi,
I am an IT Support Analyst currently working for a UK VoIP company.
I have recently installed for a Dutch customer: 2 FreePBX systems secured with enterprise grade IPTables firewall + PSAD(port scanning attack detector), replication between the 2 PBXs using Rsync and Failover with DNS Made Easy.
Off course, if your configuration allows it we can deploy DRBD + Heartbeat...
Please check my feedbacks also, I am a reliable individual!
Looking forward to working with you.
Respectfully,
Emanuel Gheorghian