In some implementations, a telecommunications network can include a core network device communicatively connectable with user equipment (UE). The UE can generate a registration request including a subsidiary request and transmit the registration request. The core network device can receive the registration request, determine the subsidiary request based on content of the registration request, and transmit an indication of the subsidiary request on behalf of the UE via the telecommunications network. A core network device can receive a registration request associated with a user equipment (UE), determine a subsidiary request based on content of the registration request, and transmit toward the UE an acknowledgement associated with both the registration request and the subsidiary request.