Manner and device of city routing of fee no-charge call

摘要

(57) Abstract Telephone call, from user position the routing is done to the city telephone call terminal point the toll-free number which turns a dial, by mapping doing to POTS router bull number inside the city tariff access area (LRCA) which includes user position. There are times when enhanced service (for example, protocol conversion and the like) is done with the city telephone call terminal point, continuously POTS router bull number to another number (for example, long distance number) which in the long distance telephone call terminal point relation telephone call the routing can do from the city telephone call terminal point to the remote telephone call terminal point is attached by mapping doing. The toll-free number which turns a dial decides the call NPANXX, for user position makes the city telephone call terminal point match which routing NPANXX to that relation is attached, mapping is done to POTS router bull number by choosing the circuit number for the city telephone call terminal point routing NPANXX and due to the toll-free number which turns a dial. Routing NPANXX is chosen from the 1st table, circuit number is chosen from the 2nd table. These tables are times when it is stored as portion of the SMS/800 service management system database inside the telephone network where this mode is disposed.