This article is devoted to the actual topic of our time.
The article describes the QoS classes of multimedia communication networks, the data transfer channel for QoS classes through the UNI-UNI interface, and the network QoS channel. The article analyzes the methods of decomposition of QoS indicators in an NGN class network, the principles of constructing an NGN network that are essential for further research, a set of QoS indicators in an NGN class network, and research results regarding the decomposition of QoS indicators.