Service processing method and system, SIP application access gateway module

The inventive embodiment discloses a service treatment method which comprises setting a session initiation protocol (SIP) application access gateway module and further comprises: the SIP application access gateway module receives service information from a sender and judges whether to interact with a value added service management platform based on the type of the service information; if it is, requests the value added service management platform to give a response when judging the authentication/charging is need to be performed, and determines whether to transmit the service information to a receiver based on the response of the value added service management platform. Accordingly, the inventive embodiment also discloses a service treatment system and a SIP application access gateway module. The technical proposal provided in the inventive embodiment can provide the authentication function during the IMS service treatment and ensure the reliability of charging during the IMS service treatment.