Abstract: A method for a fallback core network node within core network nodes for a first mobile terminated call towards a mobile subscriber initially assigned to a failing ore network node (failing CNN). The method includes receiving data associated to International Mobile Subscriber Identity and Location Area Identifier (LAI) of a mobile subscriber handled in the failing CNN. The method includes receiving a service request from a home location register (HLR), whereby the service request indicates that the fallback CNN is acting as a fallback CNN for the failing CNN, and sending a response to the service request towards the HLR comprising the roaming Number assigned by the fallback CNN. The method includes initiating a paging request towards the radio network comprising said received LAI of said mobile subscriber, and sending a Service Request towards the HLR comprising the Mobile Station Integrated Services Digital Network Number of the mobile subscriber.

Abstract: A method for a fallback core network node within core network nodes for a first mobile terminated call towards a mobile subscriber initially assigned to a failing ore network node (failing CNN). The method includes receiving data associated to International Mobile Subscriber Identity and Location Area Identifier (LAI) of a mobile subscriber handled in the failing CNN. The method includes receiving a service request from a home location register (HLR), whereby the service request indicates that the fallback CNN is acting as a fallback CNN for the failing CNN, and sending a response to the service request towards the HLR comprising the roaming Number assigned by the fallback CNN. The method includes initiating a paging request towards the radio network comprising said received LAI of said mobile subscriber, and sending a Service Request towards the HLR comprising the Mobile Station Integrated Services Digital Network Number of the mobile subscriber.

Abstract: According to the invention, it provides a Network Element (NE) acting as an originating NE for End-to-End (E2E) Circuit Service (CS) call tracing functionality, the NE comprising: a receiver configured to receive a trace activation message which contains trace control and configuration parameters, wherein the trace control and configuration parameters include at least a Trace Reference, a start triggering event, a stop triggering event, an E2E call tracing option and an address of a Trace Collection Entity; a storage device configured to store the trace control and configuration parameters received by the receiver; a trace data reporter configured to start a trace session with the Trace Reference, to start a Trace Recording Session with a Trace Recording Session Reference when the start triggering event occurs, and to record and output trace data according to the stored trace control and configuration parameters; and a sender configured to detect that the E2E call tracing option is included in the trace activ