Method, system, unit and access routing apparatus for sensing IMS customer non-SIP application

The embodiment of the invention provides a method for sensing non-SIP application of an IMS user. The method comprises: an access route device records non-SIP application information of the IMS user executing non-SIP application currently; and before a non-SIP application sensing unit executes a call request signaling route processing for the recorded IMS user, the recorded non-SIP application information is provided to the non-SIP application sensing unit. The embodiment of the invention also provides a system for sensing the non-SIP application of the IMS user and comprising the access route device and the non-SIP application sensing unit, the access route device comprising a data processing module and a non-SIP application information providing module, and the non-SIP application sensing unit comprising a non-SIP application sensing module and a call request signaling route processing module. The embodiment of the invention can sense that whether the IMS user executes the non-SIP application currently or not, thereby avoiding signaling route redundancy possibly occurring in a subsequent process.