Satellite communication networks in Europe have been in the market for more than 40 years with consolidated capacity to connect remote areas and represent an essential tool for state members. Therefore, it is evident that there is a need to allow the satellite operators to manage GOVSATCOM users efficiently with the overall available resources. This project aims to evolve the flagship European initiative “GOVSATCOM-HUB” to improve the flexibility of satellite network operators in allocating their resources to the needs of GOVSATCOM users. This goal will require the development of a new interface between the G-HUB and the 5G core network entities and microservice-based services interacting among them to provide network management tasks. Moreover, the 5G-HUB project will address the interoperability issues, allowing the GOVSATCOM user terminal to connect to different space assets, eventually including terrestrial systems. This project aims to validate the G-HUB functions in three trials with the initial development of a unified 5G NTN terminal in Ku and X bands. The trials will aim to verify the system performance in terms of resource allocation, quality of service provision, and capacity to switch communication (traffic steering) from the satellite network to the terrestrial network in a way that is unnoticeable to the user. These trials will be based on critical scenarios of emergency management where there is the need to coordinate teams in remote areas where satellite systems mainly provide connectivity. The interoperability of different satellite operators will also be investigated in this context.