Abstract: A method of recording the bi-directional communication between a customer premises equipment (CPE) and a server of a stored program controlled system (SPCS) in an analog display services interface (ADSI) for facilitating the troubleshooting therein is disclosed. The present invention includes accessing the telephone set by a user, therefore initiating the communication between the telephone set and the server. After receiving an alerting signal from the server, the alerting signal and the corresponding received time of the alerting signal are recorded into a trace area in the telephone set. A first acknowledgment signal is sent to the server after the alerting signal is recognized, and the first acknowledgment signal is then recorded in the trace area. At least one message is sent from the server, and then the message, a start received time and an end received time of the message are recorded into the trace area and a message buffer.