receiving, from a second network function, a first request message indicating a terminating access domain selection (T-ADS) request, wherein the T-ADS request comprises an identifier associated with a user equipment (UE);

determining that the UE has a fifth generation core (5GC) subscription from which the UE receives 5G subscription data;

based at least in part on the received first request message, retrieving first domain selection information from an evolved packet core network (EPC);

retrieving second domain selection information from a third network function in response to determining that the UE has the 5GC subscription; and

transmitting, to the second network function, a first response message comprising a combination of the first domain selection information retrieved from the EPC and the second domain selection information retrieved from the third network function.