Patent ID: 9077806
Filing Date: 2015-07-07
Classification: H04L,H04M,H04W

Abstract:
1. A method for implementing secure call forwarding, comprising: a calling party user equipment (UE-A) calling a called party user equipment (UE-B), and the called party UE-B enabling a subscribed call forwarding service; a key management server (KMS) obtaining information of an authentic call-forwarded party user equipment (UE-C) of the called party UE-B through an application server, wherein the step of the KMS obtaining information of an authentic call-forwarded party UE-C of the called party UE-B through an application server comprises: the application server including encrypted binding relation information of the called party UE-B and the call-forwarded party UE-C in a call request message and sending the call request message to the call-forwarded party UE-C; and the key management server judging whether the call-forwarded party UE-C is an authentic call-forwarded party UE-C of the called party UE-B according to the message including the encrypted binding relation information sent by the call-forwarded party UE-C, wherein the encrypted binding relation information refers to the binding information of the user B and the user C encrypted by using a shared key of the application server and the KMS; the call-forwarded party UE-C obtaining a media key from the key management server, wherein the media key refers to a key for protecting a media flow; and the calling party UE-A establishing a call connection with the call-forwarded party UE-C.