Our company is a voip wholesale carrier,which is based in hongkong having many years experiments in the voip wholesale marketing ,providing best routes with competitive rate and professional technology team.
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.