Patent ID: 6275579
Filing Date: 2001-08-14
Classification: H04Q

Abstract:
A network number management system in a telephone network compromising a plurality of switches, each of said switches covering its own service area, and a telephone number converting apparatus;each of said switches allocated with a first type of exchange number and a second type of exchange number which are peculiar to said switch, each of said switches including:a first table registering a telephone number allocated to a terminal, the telephone number having a combination of the first type of exchange number and a subscriber number;a second table registering non-existence information indicating whether or not the terminal allocated with the telephone number registered in said first table exists in the service area of said switch;a third table registering a network number allocated to the terminal existing in the service area of the switch and having the telephone number registered in said first table of a different switch among said plurality of switches, the network number having a combination of the second type of exchange number and a subscriber number;non-existence judging means, when there is a call setting request containing a connection requested telephone number registered in said first table of the switch, for judging whether or not the terminal allocated with the connection requested telephone number exists in the service area of said switch with reference to said second table; andtransferring means, when said non-existence judging means judges that the terminal does not exist in the service area of said switch, for transferring the call setting request to said telephone number converting apparatus; andsaid telephone number converting apparatus including:a fourth table in which the telephone number registered in said first table of one of said switches corresponds to the network number registered in said third table of another switch with respect to a same terminal;converting means, when receiving the call setting request transferred from one of said switches, for referring to said fourth table and for converting the connection requested telephone number of the call setting request into a corresponding network number; andtransferring means for transferring the call setting connection request containing the connection requested telephone number converted by said converting means to a switch having a second type of exchange number contained in the connection requested telephone number after being converted,wherein the subscriber number contained in the telephone number registered in said first table includes only numerals of 1 through 9 and A based on a hexadecimal number, andwherein the subscriber number contained in the network number registered in said third table includes one of numerals of B through F based on the hexadecimal number.