Unified Communications (UC) are vastly becoming the most preferred set up for small and medium businesses telecommunication systems. Traditional on-premise PABX telephone systems have been in use in business since the early 1960’s. By the 1990’s the systems had become more flexible but although they have evolved over time to better provide for the needs of business, it was the introduction of VoIP that really impacted the market. That said; the way we talk about PABX hasn’t changed a lot in the last 5-10 years. It usually involves a discussion about hardware, services, a contract and a recurring payment theme.