In the past, when you call an office building or business, you would either be transferred to the department you want to talk to, or given their extension number. This extension is usually a 2-3 digit code that when dialed, transfers you automatically to the particular person or department you want to speak with. The reason why this code works is because it is programmed into a PBX system.
Evolutiontel is an Australian owned company specialising in Voice over Internet Protocol (VOIP). Our first project was to provide a VOIP service that allows voice and video calls over the internet without sacrificing quality.