Media stream association method and device for interworking call of IMS (information management system) network and 2G (2-generation)/3G (3-generation) networks

The embodiment of the invention discloses a media stream association method and a device for interworking call of an IMS (information management system) network and 2G (2-generation)/3G (3-generation) networks. The method comprises the steps as follows: the CDR (call detail record) information of a Mn interface data packet; a corresponding CDR record is created and is added to a CDR information list of the Mn interface data packet; then the IP address and port number information of a Mb interface data packet are extracted; a corresponding CDR record is created and is added to a CDR information list of the Mb interface data packet; the IP address and port number information of an interface data packet between an IMS-MGW (information management system-media gateway) network and a CS (computer security) network are extracted; then a corresponding CDR record is created and is added to the CDR information list of the interface between the IMS-MGW (information management system-media gateway) network and the CS (computer security) network; and the flows respectively corresponding to the CDR records of three interfaces with the same IP address and port number are associated into the same flow. The embodiment realizes the automatic association of the flows by associating the CDR records with the flows at the two ends of the network, thus effectively improving the working efficiency.