Hello, I'm a voip specialist with over 10 years of experience working on the TS department of a VoiP company; I can install, troubleshoot and customize many VOIP devices including: softphones, ATAs, IP-phones and PBX systems like Asterisk/FPBX. I read your project description and I can certainly help you installing your FPBX solution, configure your trunks, dial-plans, firewall, Goip, extensions etc. You may contact me through chat at any time.
Thank you.