METHOD OF CONNECTING PHONE CALL USING SWITCHING TYPE THROUGH TONE SENSING

摘要

PURPOSE: A call connection method which uses a tone sensing switch mode is provided to recognize a call connection state by using a virtual bell. CONSTITUTION: A terminal on a transmission side transmits an IAM(Initial Address Message) to a switching unit. The switching unit receives the IAM and transmits an ACM(Address Complete Message). The switching unit transmits the IAM to a terminal on a transmission side(S10). The ACM is received from the terminal on a transmission side(S12). The switching device receives an ANM(Answer Message) from the terminal from a transmission side.