Method for realizing speech service switching to circuit type data service

The present invention discloses a method of switching voice traffic to a circuit-type data service, applied to an IP based core network and the IP-based CDMA system, the method comprising: the mobile terminal sends a service feature change to the mobile switching center code; the mobile switching center to change the setting pattern according to the service bearer update request message; and the bearer update request message to the base station controller; base station controller according to the bearer update request message transmits a handover request to the mobile switching center. To change the data traffic type circuit according to the present invention, the mobile switching center by the voice service is detected, the base station does not need to configure the controller detects TC, thereby saving system resources.