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.
Tempura Communications are a distributor of ISP and Telco services and related products including videoconferencing, security, and IT, serving the Reseller community throughout the UK, Europe and the US.