Business processing method, system and equipment for circuit commutative field

The embodiment of the invention discloses a circuit commutative (CS) field service processing method for receiving the calling UE confirmed by the base station and a called UE located in a same base station and a same gathering base station, sending the local loop indication. According to the local loop indication, the communication mode of the calling UE and the called UE is shifted as the local loop mode. The embodiment of the invention also discloses a CS field service processing system and a device. The method, system and device of the invention can reduce the bandwidth demand and the service flow transmitting time delay.