Hi,
I am VoIP engineer with 6 years of experience in deployment large scale telephone networks. I am very experienced with asterisk PBX installation and configuration(IVR, static/dynamic call queues, virtual extensions, conference, AGI/AMI scripting), Hylafax/Avantfax systems.
I'm also very experienced with asterisk and FreePBX/Trixbox installation and configuration so we can choose the best solution for you.