We also provide professional services consisting of installation, turnkey projects, implementation services, customer support, training and maintenance services, customization and project management. Our professional services also include enhanced support options known as managed services, which are mainly offered to customers in the United States and are performed from our offices. These managed services include performing day to day billing operational tasks.
In addition to our billing solutions, we offer call management systems used by organizations for call accounting, telecom expense management, traffic analysis and fault detection. Our enterprise software product has been installed on about 20,000 switches around the world. Our high-end product PhonEX ONE, delivers one unified solution for all voice communication expenses including tradition IP and mobile telephony. The flexible and scalable architecture of PhonEX ONE meets the needs of large enterprises supporting and unlimited number of extensions and sites.
We primarily use two business models when we sell our solutions. The license model and the managed services model. In the license model the customer pays a onetime implementation fee, a onetime license fee for a perpetual license limited by the traffic metrics chosen by the customer and additional fees to expand above the limitation. In addition, we are paid maintenance fees to renew periodically the maintenance agreement at the customer’s discretion. In the managed services model, the customer pays a onetime implementation fee, and then a monthly fee that includes a periodic license or right to use, maintenance and service fees, calculated by the metrics chosen by the customer, mainly by number of subscribers.