Plum Communications is pioneering a groundbreaking new technology, which is set to revolutionise the way businesses communicate. SIP (Session Initiation Protocol) is a means of signalling and controlling interactive communication sessions. These sessions include Internet telephone calls, multimedia distribution and multimedia conferences. The uptake of SIP spells out better control over communications for businesses and has considerable cost benefits. Calling from one SIP-enabled phone to another cuts out traditional routing that occurs with traditional lines and reduces call charges considerably. The new technology delivers presence and allows users to inform others of their status, their availability, and the method of how they can be contacted before a communication session even begins. SIP also allows a geographic presence (local number) in different towns and cities.