The 5G-HUB project enables resilient 5G services through TN–NTN integration and seamless vertical handover. Within this strategic context, 5G-HUB acts as an enabling project, focusing on the integration of 5G Terrestrial Networks (TN) and 5G Non-Terrestrial Networks (NTN). The 5G-HUB project extends this paradigm by including the terrestrial 5G ecosystem, thereby creating a truly integrated environment where resources can be managed in a coordinated manner. In the context of the IRIS² system, the relevance of the 5G-HUB project becomes even more strategic. In conclusion, the 5G-HUB project can be regarded as a technological and conceptual bridge between terrestrial 5G networks and next-generation governmental satellite communications.