Controlling supplementary subscriber services in overlayed IMS-based telecommunications network

An arrangement for controlling supplementary subscriber services in first and second operatively connected, overlaid telecommunications networks wherein supplementary subscriber services available to a subscriber in said first telecommunications network may be executed in said second telecommunications network, and said supplementary subscriber services are controlled by said subscriber from said first telecommunications network, and said first telecommunications network is provided with a supplementary subscriber services handling Indicator for indicating in which one of said first and second telecommunications network a supplementary subscriber service of a subscriber is to be executed,

• said first telecommunications network is arranged for storing said supplementary subscriber services handling indicator as a data element in a register of said first telecommunications network 1 and for checking said supplementary subscriber services handling indicator stored in said first telecommunications network to determine, at the receipt of a supplementary services control message of a subscriber in said first telecommunications network, in which one of said first and second telecommunications network said supplementary subscriber services control message has to be processed.

A Home Location Register, HLR, for use in a Public Land Mobile Network (PLMN), operating in accordance with Global System for Mobile communications (GSM), GSM being the first network of first and second operatively connected, overlaid telecommunications networks, wherein supplementary subscriber services available to a subscriber in said first telecommunications network are executed in said second telecommunications network, said supplementary subscriber services being controlled by said subscriber from said first telecommunications network, and said first telecommunications network being provided with a supplementary subscriber services handling indicator, indicating in which one of said first and second telecommunications network a supplementary subscriber service of a subscriber is to be executed,

• said register being arranged for storing said supplementary subscriber services handling indicator as a data element, such that said stored supplementary subscriber services handling indicator is checked to determine, at the receipt of a supplementary services control message of a subscriber in said first telecommunications network, in which one of said first and second telecommunications network said supplementary subscriber services control message has to be processed, wherein said register is a Home Location Register HLR of a subscriber of said PLMN.

A network switching node of a first telecommunications network, providing call handling support to a subscriber of the first telecommunications network of first and second operatively connected, overlaid telecommunications networks, wherein supplementary subscriber services available to a subscriber in said first telecommunications network are be executed in said second telecommunications network, wherein said supplementary subscriber services are controlled by said subscriber from said first telecommunications network, and said first telecommunications network is provided with a supplementary subscriber services handling indicator, for indicating in which one of said first and second telecommunications network a supplementary subscriber service of a subscriber is to be executed,

• said network switching node is arranged for receiving and forwarding a supplementary subscriber services handling indicator stored in a register of said first telecommunications network and supplementary subscriber services control messages for controlling supplementary subscriber services to be executed In one of said first and second telecommunications networks in accordance with said stored supplementary subscriber services handling indicator.

A data management server for use in a second telecommunications network of first and second operatively connected, overlaid telecommunications networks, wherein supplementary subscriber services available to a subscriber in said first telecommunications network are executed in said second telecommunications network, wherein said supplementary subscriber services are controlled by said subscriber from said first telecommunications network, and said first telecommunications network is provided with a supplementary subscriber services handling indicator, indicating in which one of said first and second telecommunications network a supplementary subscriber service of a subscriber is to be executed,

• said data management server is arranged for executing a supplementary subscriber services 5 control message forwarded by said first telecommunications network in accordance with a supplementary subscriber services handling indicator stored as a data element in a register of said first telecommunications network.