FIELD: physics, computer engineering.
SUBSTANCE: invention relates to computer engineering. An authentication system, comprising an application server (AS), providing a non-Internet Protocol Multimedia Subsystem (non-IMS) service, an authentication gateway and IMS user equipment, wherein the AS is configured to forward a connection request message transmitted from the IMS user equipment to the authentication gateway and a first random number transmitted from the authentication gateway to the IMS user equipment, to transmit a first response parameter, generated from the first random number, fed back from the IMS user equipment to the authentication gateway and to provide the IMS user equipment with the non-IMS service in response to an instruction of the authentication gateway; the authentication gateway is configured to acquire the first random number and an expected response parameter of the IMS user equipment, to transmit the requested first random number to the AS, to determine that the IMS user equipment has been authenticated successfully if comparison of the first response parameter transmitted from the AS with the requested expected response parameter shows consistency and to instruct the AS to provide the IMS user equipment with the non-IMS service; and the IMS user equipment is configured to transmit the connection request message to the AS, to generate the first response parameter from the first random number transmitted from the AS and to transmit the generated first response parameter to the AS.
EFFECT: high efficiency of service data processing of an application server.
30 cl, 15 dwg
