METHOD, RELATIVE APPARATUS AND SYSTEM FOR RECOVERING CALLED SERVICE OF TERMINAL

摘要

Disclosed are a method, a relative apparatus and a system for recovering a called service of a terminal. The method comprises: when a called request to a user terminal is received, querying for an initial proxy call session control function (P-CSCF) entity currently registered by the user terminal; if it is detected that a fault occurs on the initial P-CSCF, selecting an available P-CSCF, and sending a notification message carrying a disaster recovery identification to the available P-CSCF, the disaster recovery identification being used for instructing the available P-CSCF to trigger the user terminal to re-register the P-CSCF; when a registration completion message sent by the P-CSCF re-registered by the user terminal is received, delivering the called request to the re-registered P-CSCF to bear the called service of the user terminal. By using the solutions, fault recovery can be rapidly implemented in existing network architecture.