Call Connection Method used Common Channel Signalling Module in AICPS

摘要

PURPOSE: A call connection method using common channel signaling module in an AICPS(Advanced Information Communication Processing Subsystem) is provided to execute a call connection based on a common channel signaling module between a telephone exchange and an AICPS. CONSTITUTION: If a telephone exchange transmits a call connection request message to a CNAS(Common channel signaling Network Access Subsystem) through an STP(Signaling Transfer Point) according to a PSTN subscriber's call connection request, the CNAS receives the call connection request message and analyzes it(S21). The CNAS extracts a signaling point and a CIC(Circuit Identification Code) from the call connection request message(S22). Based on the signaling point and the CIC, the CNAS searches a call distribution table, selects a TNAS(Telephone Network Access Subsystem), a link and a channel, and transmits the call connection request message to the selected TNAS through the selected channel(S23-S25). In response to the call connection request, the TNAS transmits a response message to the CNAS(S26).