Method and system for implementing third-party authentication based on gray list

A communication system including a non-transitory computer-readable storage device storing computer-executable instructions which, when executed by a processor of a computing device in an IP Multimedia System (IMS) network, configure the processor to:

• receive a service request from a requesting party in the IMS network;
• perform a third-party authentication on the service request by selecting a first authenticating party in the IMS network according to a gray list and obtaining an authentication result;
• process the service request according to the authentication result;
• modify a service level granted to the requesting party in response to a request from the first authenticating party in the IMS network;
• wherein the processor is further configured to dynamically update the gray list according to the request.

A communication method executed in an application server in an IP Multimedia System (IMS) network, the method comprising:

• receiving a service request from a calling party in the IMS network;
• performing an authentication on the service request by selecting a first authenticating party in the IMS network according to a gray list and obtaining an authentication result;
• processing the service request according to the authentication result;
• modifying a service level granted to the calling party in response to a request from the first authenticating party in the IMS network;
• and
• further comprising dynamically updating the gray list according to the request.