Method of providing seamless session mobility

摘要

The invention concerns a method of performing a handover of a real time communication session (60, 62), as well as a call signalling server (1011) for performing the handover of the real time communication session (60, 62). The real time communication session (60, 62) is established between a first terminal (10) of a subscriber (1) and a terminal (20) of a communication partner (2) of the subscriber (1) through a packet network (300). The handover is performed from the first terminal (10) of the subscriber (1) to a second terminal (11) of the subscriber (1), whereby the first terminal (10) of the subscriber (1) is associated with a first access network (102) of the packet network (300) and the second terminal (11) of the subscriber (1) is associated with a second access network (103) of the packet network (300). A call signalling server (1011) generates, in response to a trigger, control messages regarding the processing of the handover. The control messages are received and processed at a network node (1010). A communication session (61) with the second terminal (11) of the subscriber (1) is established. Data packets received from the first terminal (10) and the second terminal (11) of the subscriber (1) are mixed onto a data stream of the communication session (62) towards the terminal (20) of the subscriber's communication partner (2). Data packets received from the terminal (20) of the subscriber's communication partner (2) are copied onto data streams of the communication sessions (60, 61) towards the first terminal (10) and the second terminal (11) of the subscriber (1). The exchange of data packets between the network node (1010) and the first terminal (10) of the subscriber (1) via the first access network (102) is terminated within the context of the communication session (60, 61, 62) on completion of the handover.