Abstract: A mobile communication method according to the present invention includes a step A of causing an SCC-AS to transmit an inquiry signal to an HSS when the SCC-AS receives “Invite” addressed to a UE; a step B of causing the HSS to transmit a paging request signal; a step C of causing the HSS to determine a RAT which the UE is served in response to a paging result notification signal including a paging result in at least one of an UTRAN/GERAN and an E-UTRAN; a step D of causing the HSS to transmit serving area information of the UE including information on the RAT which the UE is served to the SCC-AS/S-CSCF; and a step E of causing the SCC-AS/S-CSCF to transfer the “Invite” addressed to the UE, to the UTRAN/GERAN or the E-UTRAN using a terminating call scheme selected based on the serving area information of the UE.

Abstract: In a communication system having a plurality of cellular telephones connected on a communication network, and a switching apparatus that manages communication functions usable in the plurality of cellular telephones, when the switching apparatus receives a communication request from a cellular telephone on the calling side, the switching apparatus determines communication functions usable in the cellular telephone to notify a cellular telephone on the receiving side, while determining communication functions usable in the cellular telephone to notify the cellular telephone, and the cellular telephones and on the calling side and receiving side display the communication functions usable in the cellular telephone as the communicating party notified from the switching apparatus, while registering the communication functions usable in the cellular telephone as the communicating party after finishing communication, respectively.