The invention discloses a method for simulating call, a device and a system, belongs to the network communication field. The method comprises: receiving the request of a called user of simulating call; according to the request, simulating the call of the called user; when a simulation call office which has the call passed through and any one of offices which have the called user are abnormal, determining failure of the call; when the simulation call office which has the call passed through and any one of offices which have the called user are normal, determining success of the call. The device comprises a receiving module, a call module and a judging module. The system comprises: a simulation call office control device and a simulation call office. The invention can simulate a real call of users, when locating faults during the call process, the invention does not need locate faults to a fault applying position which initiates testing call, improves fault location efficiency and satisfied degree of users, saves maintenance cost, shortens time of solving problems, also can be used for testing new services, saves testing cost.