Method and device for authenticating a subscriber for utilizing services in a wireless lan (wlan)

Procedure for authentication of a user (MT, 6) for utilizing services in a local network wireless LAN (WLAN 10) using an IP multimedia subsystem (IMS, 3) of a mobile radio network, wherein a user ( MT, 6) to authenticate, located in a place with coverage LAN wireless LAN, it receives assigned from the LAN wireless (WLAN, 10) an IP address, after which it is authenticated against the multimedia subsystem IP (IMS, 3) with the indication of the IP and the SIP register address being reported an element (WAGN, 2) of the LAN wireless connection (WLAN, 10) of the result of user authentication (MT, 6) against the IP multimedia (IMS, 3) system.