Abstract: The present disclosure provides a method, device and system for implementing emergency call override service; wherein the implementation method comprise: a first application server (AS) on a called side receives an initial request message, carrying a service identifier indicating an emergency call override service, from a second AS on a calling side; and the first AS implements the emergency call override service according to the service identifier. In the IMS network architecture, by adding a service identifier, indicating emergency call override service, in an initial request message based on SIP, an AS network element on a called side can implement emergency call override service according to the service identifier, thereby solving the problem that the emergency call override service cannot be implemented in the current IMS network architecture.

Abstract: The present disclosure provides a method, device and system for implementing emergency call override service; wherein the implementation method comprise: a first application server (AS) on a called side receives an initial request message, carrying a service identifier indicating an emergency call override service, from a second AS on a calling side; and the first AS implements the emergency call override service according to the service identifier. In the IMS network architecture, by adding a service identifier, indicating emergency call override service, in an initial request message based on SIP, an AS network element on a called side can implement emergency call override service according to the service identifier, thereby solving the problem that the emergency call override service cannot be implemented in the current IMS network architecture.

Abstract: This invention provides method and device for blind transfer service. The method comprises the following steps: first, user A establishes a call with user B, then, user B originates a call transfer request to request to transfer the call with user A to user C; application server of user B heads off the request and returns an accept response to user B; the application server of user B firstly originates a call invitation to user C and acquires media parameter information of user C; the application server of user B originates a call re-invitation to user A, provides the media parameter information of user C, instructs user A to carry out media switch, and acquires media parameter information of user A; the application server of user B provides the media parameter information of user A to user C, and instructs user C to establish a media stream connection with user A.

Abstract: This invention provides consultative transfer service method and apparatus.