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.
Bara Phone Ltd. Is registered UK company in London, we are interconnected to tier one carriers using TDM and VOIP service to deliver high quietly service to its B2B and end user clients along with competitive international rates.