Patent ID: 8477925

Claim:
A call method for a private branch exchange user, comprising: receiving a data query request from a Call Session Control Function, wherein the data query request comprises a number of a private branch exchange user, the data query request is sent by the Call Session Control Function after the Call Session Control Function receives a call request from the private branch exchange user, and the call request comprises the number of the private branch exchange user; if the private branch exchange user has opened an account but not registered, sending a data query success response to the Call Session Control Function so that the Call Session Control Function forwards the call request to an application server, wherein the data query success response comprises information about a wildcard user corresponding to the private branch exchange user; receiving, a user data request from the application server, wherein the user data request comprises the number of the private branch exchange user, and the user data request is sent by the application server after the application server receives the call request forward by the Call Session Control Function; and sending a user data response to the application server, wherein the user data response comprises user data of the private branch exchange user.