SYNCHRONIZING CALL STATES OF NETWORK COMPONENT AND MOBILE DEVICE AT SESSION TRANSFER

摘要

A technique for synchronizing a first call state of a network component (340) of a telecommunications network (300) and a second call state of a mobile device (200) is provided. The mobile device (200) is connectable to the telecommunications network (300) via a first Radio Access Technology (310) and a second Radio Access Technology (320). The telecommunications network (300) forwards towards a callee (400) an invitation for a call. The call originates via the first Radio Access Technology (310) from the mobile device (200). The telecommunications network (300) further sends a first message corresponding to a response of the callee (400) towards the mobile device (200). As to a method embodiment of the technique, the network component (340) triggers a transfer of the call session of mobile device (200) from the first Radio Access Technology (310) to the second Radio Access Technology (320). The first call state is set in accordance with the response of the callee (400). Information indicative of the second call state is received from the mobile device (200), and a second message for changing the second call state in accordance with the response is provided to the mobile device (200) in case the first call state and the second call state are inconsistent.