In some examples, a user equipment (UE) is registered with a fifth generation (5G) core network. In response to an emergency indication, the UE selects a first domain intended for a call responsive to the emergency indication. Subsequent to selecting the first domain, the UE attempts a combined registration with a second core network different from the 5G core network. In response to attempting the combined registration, the UE receives a further indication that the UE is registered for packet switched services but not circuit switched services. In response to the further indication, the UE selects an access network connected to a third core network to perform the call.