Development of a number of communication tools (e-mails, instant messaging, telephony and video conferencing) led to a new class of collaborative interaction services (Unified Communications). The idea of "Presence Server" has formed the basis of a new concept of the communication, indicating the availability of a subscriber and providing for the convenient communication method with the subscriber from any user equipment, stationary or mobile. Making use of these technologies a large number of organizations increased performance efficiency of the employees and reduced costs of communications.