CALL CONNECTION METHOD WHEN MUTUALLY REQUESTING A CALL SIMULTANEOUSLY, PARTICULARLY FOR CONNECTING A CALL OF A CALLER TO A CALLEE WITHOUT REQUESTING A CALL SETUP FROM THE CALLEE WHEN BOTH THE CALLER AND THE CALLEE SIMULTANEOUSLY REQUEST CALL SETUP

摘要

PURPOSE: A call connection method when mutually requesting a call simultaneously is provided to reduce a probability of call failure by flexibly processing calls. CONSTITUTION: A caller terminal requests call setup from a callee terminal(S10). An origination MSC(Mobile Switching Center) requests home location registration from the caller terminal and registers a home location in an origination HLR(Home Location Register)(S20). The origination MSC analyzes an MAP(Mobile Application Part) message and stores a caller's phone number and a callee's phone number in an MAP storing unit(S30). The origination MSC attempts call connection to a termination MSC(S40). The termination MSC checks whether the callee terminal is busy(S50). If the callee terminal is busy, the termination MSC checks whether the callee terminal is requesting call setup(S60). If the callee terminal is requesting call setup, the termination MSC checks a phone number requested for the call setup(S70). If the call setup request phone number is the same as the caller's phone number(S80), the origination MSC does not request call setup from the termination MSC and performs call connection in response to the request signal of the termination MSC(S90).