An application server receives, from a subscriber server, terminating access domain selection (T-ADS) information for an Internet protocol multimedia subsystem (IMS) session of a wireless device. The T-ADS information comprises a first wireless device Internet protocol (IP) address and a first network name of a first radio access technology (RAT) for the IMS session. The T-ADS information comprises a second wireless device IP address and a second network name of a second RAT. A determination is made of an access network for the IMS session based on the T-ADS information. The access network is one of the first RAT or the second RAT. An IMS message to setup the IMS session over the access network is sent to the wireless device.