When using the user to log in to DSMP or use the data service, the service gateway or portal sends this message to DSMP, and checks the legality and validity of the user using the data service (whether it is activated). Different from the user entry mode in the service gateway and portal, user authentication: 
1, according to the user's MSISDN number, authentication
2, according to user Pseudo code for authentication
3, authenticate
4 according to the user's MSISDN number and password, authenticate according to user pseudo code and password
Different authentication modes, authtype fill in different values, which means, please refer to the reference process of the interface specification volume corresponding to each gateway device.
A method for authenticating a user attempting to access a service from a service provider in a communication network, the method comprising: assigning a number of services for accessing each service for users. Identification; requesting a request from the user, the request identifies the service to be accessed and includes the public key of the user; at the authentication authority, authenticate the request is identified, issuing the service dedicated identity and the location The public key certificate bound by the public key is bound to the request, and the disclosure key certificate is returned to the user.