Network initiated CS services during IMS call
Abstract:
Methods, nodes, a terminal, a communication system and computer programs to be used in association with terminating a circuit switched signaling service to a terminal (108) via a circuit switched access of a mobile network (100) are described. In one method, the signaling service is different from a voice call via the circuit switched access and from a mobile terminating location request service. A call via an internet protocol domain of the mobile network (100) and a packet switched access of the mobile network (100) is or is being established for the terminal (108). The method is performed by a control node (104) of the mobile network (100) and comprises receiving (112) a paging request for paging the terminal (108) via the packet switched access. The paging request is for the circuit switched signaling service. The method comprises determining (118) whether a call via the internet protocol domain and the packet switched access is or is being established for the terminal (108) depending on the received paging request. The method comprises sending (120a) a paging rejection for rejecting the received paging request depending on the call via the internet protocol domain and the packet switched access is or is being established for the terminal (108) and sending (120b), via the packet switched access, a paging request for paging the terminal (108) depending on the call via the internet protocol domain and the packet switched access is not or is being not established for the terminal (108). Therefore an interruption of the call established or currently being established via the internet protocol domain may be avoided during a handling of the circuit switched signaling service to be terminated.
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