The invention discloses a strategy control method and apparatus, a Diameter Routing Agent (DRA), and a Proxy Call Session Control Function (P-CSCF). The method comprises the steps in which, the DRA forwards a response message carrying an error cause value and being returned by a spare PCRF to the P-CSCF when UE makes a VoLT call and the P-CSCF requests specially uploaded resources from an abnormal master PCRF; and the P-CSCF transmits a fault indication message to an S-CSCF based on the error cause value, so that the S-CSCF can trigger an HSS to re-establish IMS PDN connection for the UE.