is when a branch office does not see the distance to the head office and other branch offices as a problem. Who owns the office buildings? We should note that enterprises increasingly hire office spaces in large office buildings, maybe sharing a common communication network with other enterprises. Virtual private network (VPN) functions, security mechanisms and administration of these are also vital in order to avoid information leaks. Partners Effective communication with partners is essential. Thus enterprises need call-centres, e-business enabled company web sites or portals for B2B communication, and effective means of bit transport with sufficient bandwidth for external and extranet communications. The partners and their employees normally have access to large parts of an enterprise's intranet, its facilities and information. Some information is of course confidential and may only be accessed by the enterprise employees. Application services providers (ASP) and Internet service providers (ISP) The general trend today is that enterprises want to focus strictly on the core business, that is, what is expressed as a business idea in the business plan. The reason is that they want Understanding Changing Telecommunications - Building a Successful Telecom Business to increase effectiveness and competitiveness. Non-core activities and assets, for example housing and management of housing, communication networks, cleaning and commodity manufacturing with no strategic content is outsourced to other companies. In doing this the enterprises gain two things. One is that they don't need to waste management attention and other company resources on non-core business activities. The second gain is that other companies that are specialized in the respective areas probably will do it much cheaper and better due to large-scale operations and specialized experts. This is a reason for outsourcing, in this case outsourcing communication and Inter- net services. Services and content for specific applications are sourced from specia