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The current trend of convergence of networks of different types, the increase in the volume of traffic, the emergence of multimedia applications running in real time, necessitates ensuring the end-to-end quality of service (Quality of Service, QoS). To date, there exist several approaches to ensure QoS (A1‒A3):–A1: based on the use of routing metrics of communication channels, interconnected through QoS-indicators;–A2: based on the implementation of technology of Traffic Engineering (TE), which focuses on the effective load balancing along an infocommunication network;–A3: through the implementation of a multipath routing while ensuring the required QoS indicators. When analyzing these approaches, it is worth noting that A1 and A2 are focused only on improving the quality of service in an infocommunication network in general and give no warranties regarding the numerical values for the main indicators of QoS. In contrast to the first two approaches, the third approach is aimed precisely at calculating the routes that guarantee the specified values of such QoS metrics as the packet transfer rate, average end-to-end delay, the probability of packet loss, etc. The given approaches largely determine the quality of network performance (NP). However, in practice, ensuring QoS is defined, taken all together, by the quality of network performance (NP) and the quality of experience (QoE) at the user level. In this case, providing the required level of QoE is central and essential in order to optimize the income and resources of the provider/operator.