The VOIP is a technology oriented business. If you buy Sysmaster you need the tech skill to operate it. It is linux based system and require VOIP ,Linux skill to set up and operate. VOIP requires skill in – Gateways,Gatekeeper, billing, Codec selections , bandwidth mngnt, firewall Qos etc. It is not a simple job. The complaint may not be particular to Sysmaster but applicable to all VOIP products. The CISCO require CISCO Certified prof. to set up and operate and like wise the Sysmaster need skill to operate.