Telephone systems have been one of the most important communication instruments for a long time. They are used in all spheres of life, from home to business and public services. But in hospitality, particularly hotel telephone systems are an absolute essential. PBX (Private Branch Exchange) systems, in particular, have several advantages over traditional hotel telephone systems. A Business PBX phone system allows hotel guests to make local and long-distance calls at any hour of the day. The system replaces the hotel's standard phone system with a private line based on the VoIP technology.