rious meanings. For example, in the European Union [3] it is defined as the ability of all Internet end-users to access and distribute information or to run applications and services of their choice. Another definition is that all Internet traffic should be treated equally, without any discrimination, restriction, or interference, independent of the sender, receiver, type, content, device, service, or appli- cation. Another possible definition of network neutrality is the absence of unreasonable discrimination on the part of network operators for the transmission of Internet traffic. However, not all definitions are exactly the same. For example, "all traffic to be treated equally" may refer to prohibition of any form of differentiated QoS provision. But if the definition refers to all Internet traffic to be treated equally, that does not prohibit differ- entiated QoS (e.g. QOS differentiation can be applied to different Internet traffic types such as voice, video, torrent, email). There are two general types of services over broadband access networks [4]: Internet access service (IAS). This is in fact access to the public Internet over fixed or mobile access networks, which provides connectivity to the Internet and with that to all OTT (i.e. data) services. Specialized services. They refer to all services provided over the managed IP networks by using the same broadband access as IAS. These managed IP networks for spe- cialized services use strict admission control and are typically optimized for specific content, applications, or services (e.g. operator's grade VoIP, such as VoLTE, IPTV, critical IoT services) based on extensive use of traffic management techniques to meet requirements of the content, applications, or services for a specific QoS level. The monitoring and assessment of both types of services, IAS and specialized, (i.e. managed) is performed by both telecom operators and NRAs. Typical QoS parameters which are the subject of interest for objective quality assessment are bitrates, packet delay (i.e