VOIP - Voice Over Internet Protocol. Essentially using the internet for phone calls. People are used to the likes of Sype to make calls, however dedicated VOIP services offer robust, dependable telephone exchanges which are flexible and easily scalable. Rather than being based on-premises as is the case with traditional PBX exchanges, VOIP exchanges are based in the Cloud. Offering all the same features as a traditional local telephone system - call transfer, divert, voicemail, etc - VOIP works wherever the phone handset can be connected to the internet - work, home, mobile office, etc.