 services are provided in mobile environments with QoS as well as roaming support (i.e. use of VoIP through visited mobile or fixed networks). They have advantages over the OTT VoIP via mobile broadband access networks due to guaranteed QoS at different mobility of the end-users and roam- ing features. The OTT VoIP over mobile networks are attracting users due to their user-friendly interface and bundling different OTT services within the same applica- tion (VoIP, messaging, file sharing, etc.). Another legacy service which is transferring to broadband/ultra-broadband IP net- works is IPTV and TV streaming. Regarding the TV/VoD over IP one may differentiate among several possible business models: Fully fledged architecture for PTV services. In this case the telecom operator as net- work provider is also an IPTV service provider and it provides end-to-end QoS sup- port, using either proprietary IPTV platforms or NGN functionalities. IPTV service provider. The IPTV service provider offers IPTV streams to different network providers (e.g. NGN providers). For this purpose there are requirements for NGN implementation on both sides, IPTV service provider and broadband access provider (i.e. telecom operator). Internet TV streaming. This is streaming of live TV over the public Internet, in which case there are no QoS guarantees end-to-end. However, most of the video services 6 Services in Fixed and Mobile Ultra-Broadband Table 6.11 loT services types and business models. Device Network Platform Application loT service types provider provider provider provider Critical IoT (high QoS Provider 1 requirements) Provider 1 Provider 2 Massive IoT (medium to Provider 2 Provider 1 Provider 2 low QoS requirements) Provider 2 Provider 1 Provider 2 Provider 3 Provider 1 Provider 2 Provider 3 over the Internet are VoD via many video sharing sites (YouTube is the largest such example regarding volume of generated Internet traffic). The GUI for such video streaming services is typically the Web; however, there may be developed client 