In the modern business environment, companies are increasingly under pressure to support a wide variety of voice and data communication channels between cities or locations. Employees also need to access and share information as they travel or work from remote locations or branch offices around the world. Existing WAN technologies, such as International Private Leased Circuit (IPLC) or a pure Internet access, are either too expensive or limited in their flexibility to meet changing business requirements (for example, a leased line connecting two small offices is expensive to maintain). It is out of such inadequacy that IP VPN technology has emerged as the solution.