A method is dedicated to call transfer between first and second WLAN using a wireless access technology and respective first and second secure gateways connected to a core network of a network offering packet-switched services. This method consists in, when a call has been set up between a mobile communication terminal and the core network via a first secure tunnel set up within the first WLAN network connected through to the first secure gateway and associated with authentication and security data, and if the mobile terminal enters a radio overlap area of the first and second wireless local area networks, i) pre-authenticating the mobile terminal, at the level of an IP layer, vis a vis the second security gateway, via the first tunnel, and using the authentication and security data, ii) then setting up a second secure tunnel between the mobile terminal and the second security gateway, iii) then updating mobility management information via the second tunnel, iv) then proceeding to the transfer between wireless local area networks by sending the second security gateway, via the second tunnel, a peer address updating message in respect of the mobile terminal, and v) continuing the call via the second tunnel.