ROUTING METHOD FOR INTERNATIONAL ROAMING CALL

PURPOSE: A routing method of an international roaming call is provided to directly set an ISUP(ISDN(Integrated Service Digital Network) User Part) call from a transmitting network to a visiting network without a home network. CONSTITUTION: A switch(210) of a transmitting network receives a roaming number which sets an ISUP route for a switch(230) of a visited network corresponding to a call request signal for an originating terminal from a transmitting terminal located on the transmitting network(S203,S204). The switch of the transmitting network sets an ISUP call for the switch of the visited network by using the roaming number(S205). The roaming number is generated based on response for a message which requests routing information for the visited network transmitted to an SCCP(Signal Control Connection Part) address of an HLR(Home Location Register) of the home network from the switch of the transmitting network. [Reference numerals] (210) Transmission network switchboard; (220) Home network HLR; (230) Visit network switchboard; (S200) Call request;