Patent ID: 7792260

Claim:
A method for protecting an incoming call in a coloring ring back tone service, wherein a system which provides the coloring ring back tone service comprises a service control point device, a service switch point device and an intelligent peripheral, and the service control point device respectively interacts information with the service switch point device and the intelligent peripheral by Signaling No. 7, the service switch point device interacts information with the intelligent peripheral by a part of signaling of a telephone user; and said method comprises: setting reason data that need an incoming call protection at the service control point device; a calling party initiating a call to the service switch point device, and the service switch point device sending a message for triggering an intelligent network service to the service control point device; the service control point device instructing the service switch point device to connect the call to the intelligent peripheral; the service switch point device connecting the incoming call to the intelligent peripheral, and reporting a connect result and a connect failure reason to the service control point device; the service control point device analyzing the connect result and the connect failure reason, and matching the connect failure reason for a connect failure with the reason data that need the incoming call protection, wherein if matching between the connect failure reason and the reason data that need the incoming call protection fails, the incoming call protection does not proceed; if the matching succeeds, the service control point device instructs the service switch point device to connect a called number directly; the service switch point device sending the message for triggering the intelligent network service to the service control point device again; and the service control point device sending down a continue message to the service switch point device, and the service switch point device connecting the called number.