Patent ID: 6393300
Filing Date: 2002-05-21
Classification: H04W

Abstract:
A telephone interface system, comprising:a telephone switch connected to a plurality of user terminals, each of said user terminals having a distinct identity, said telephone switch being free of a direct connection to a public land mobile network and free of a direct connection to a public switched telephone network; a fixed radiotelephone terminal connected to said telephone switch and comprising: an apparatus for reading a subscriber identity module (SIM) card; a key stored on said SIM card; means for communicating with a radiotelephone network; and means for authenticating said radiotelephone terminal to said radiotelephone network using said key; wherein: said fixed radiotelephone terminal communicates calls of said plurality of user terminals with said radiotelephone network based on said distinct identity and in accordance with an authentication step performed by said means for authenticating; and said means for authenticating performs said authentication step by using the same said key for calls of each one of said plurality of user terminals.