Patent ID: 6311073
Filing Date: 2001-10-30
Classification: H04W

Abstract:
A system for connecting a telephone switch to a fixed telephone network via a radiotelephone network, the system including a plurality of fixed radiotelephone terminals connecting the switch to the radiotelephone network, and a plurality of user terminals connected to the switch, the system comprising:call forwarding means for forwarding a call, addressed to a called one of the user terminals and containing a directory number of the called user terminal, to a mobile service switching center providing access to the called user terminal, the forwarded call containing a directory number designating a first one of said fixed radiotelephone terminals associated with the directory number of the called user terminal; andmeans situated in said center for operating as follows:if said first terminal is busy, forwarding said call to a second one of said fixed radiotelephone terminals designated by its international mobile subscriber identity (IMSI) number, said IMSI number of the second terminal being associated with the directory number of the called user terminal in a visitor location register associated with said center; andif said second terminal is busy, forwarding said call to a third fixed radiotelephone terminal designated by its IMSI number, said IMSI number of the third terminal being associated with the directory number of the called user terminal in the visitor location register associated with said center;if necessary, forwarding said call in like manner to a next IMSI number until an available one of said fixed radiotelephone terminals is found, if any.