The method of voice call fall back to the circuit switched domain, the device and system

The present invention discloses a method for fallback to CS domain voice call, comprising: receiving a service request message from the calling UE, the message includes a CS domain voice call to the called number information indicating ENB CSFB initiate handover; received from the ENB the handover request message, the message contains the information required CS handover, an MSC and the MSC sends a PS to CS handover request message, which message includes a called number information and the CS handover required, so that the call to the called MSC the UE; receiving the returned MSC PS to CS handover response message, which contains the target BSS / CS resource information prepared RNS, the UE sends a handover command message to the caller via the ENB, the message includes a target BSS / RNS prepared CS resource information such that the calling UE access 2G / 3G network. Also provides a corresponding apparatus and system. The present invention can reduce the embodiment is turned on delay.