Abstract: A terminal not equipped with a SIM is authenticated properly by a mobile core network. A communication system 7 includes a relay device 1 included in a fixed core network 6 and an HSS 56 included in a mobile core network 5. The relay device 1 includes an issuing unit 21 that issues IMSI information corresponding to a subscriber identifier of a non-SIM terminal 3 and authentication information corresponding to the IMSI information, and transmits the subscriber identifier and the IMSI information to the mobile core network 5, and a termination unit 23 that transmits the IMSI information and the authentication information of the non-SIM terminal 3 to the mobile core network 5. The HSS 56 holds the subscriber identifier and the IMSI information in association with each other, and authenticates the IMSI information and the authentication information of the non-SIM terminal.

Abstract: A call system 5 includes a setup server 1 provided on a communication network which controls communication between a calling terminal 2 and a called terminal 3 and a charging server 4 which charges the calling terminal 2. The setup server 1 includes a setup unit 21 which sets advertisement-related CAT media in a signal addressed to the calling terminal 2 during a call between the calling terminal 2 and the called terminal 3 and a measurement unit 22 which measures a start time and an end time of the setting of the CAT media in the signal addressed to the calling terminal 2. The calling terminal 2 includes a play unit which plays the CAT media. The charging server 4 includes a charge unit which charges the calling terminal 2 on the basis of the measured times.

Abstract: Unexpected call disconnection during normal time is prevented. When a gateway device 1 installed on a POI border receives RTP packets even though reception of RTCP packets is stopped, the gateway device 1 generates RTCP packets and sends out the RTCP packets to the gateway device 1's own network side or the gateway device 1 generates a call control signal showing that media transfer is continued and sends out the call control signal to the gateway device 1's own network side. Thereby, even in the case of performing interruption monitoring of RTCP packets within the gateway device 1's own network, it is possible to prevent unexpected call disconnection during normal time accompanying change in RTCP packet sending-out conditions.

Abstract: A terminal not equipped with a SIM is authenticated properly by a mobile core network. A communication system 7 includes a relay device 1 included in a fixed core network 6 and an HSS 56 included in a mobile core network 5. The relay device 1 includes an issuing unit 21 that issues IMSI information corresponding to a subscriber identifier of a non-SIM terminal 3 and authentication information corresponding to the IMSI information, and transmits the subscriber identifier and the IMSI information to the mobile core network 5, and a termination unit 23 that transmits the IMSI information and the authentication information of the non-SIM terminal 3 to the mobile core network 5. The HSS 56 holds the subscriber identifier and the IMSI information in association with each other, and authenticates the IMSI information and the authentication information of the non-SIM terminal.

Abstract: Unexpected call disconnection during normal time is prevented. When a gateway device 1 installed on a POI border receives RTP packets even though reception of RTCP packets is stopped, the gateway device 1 generates RTCP packets and sends out the RTCP packets to the gateway device 1's own network side or the gateway device 1 generates a call control signal showing that media transfer is continued and sends out the call control signal to the gateway device 1's own network side. Thereby, even in the case of performing interruption monitoring of RTCP packets within the gateway device 1's own network, it is possible to prevent unexpected call disconnection during normal time accompanying change in RTCP packet sending-out conditions.