Patent ID: 7949016

Claim:
Communication equipment in an interactive communication system including a plurality of communication equipments that are connected to each other via a communication line, comprising: an error reception unit to receive reception error information at a reception side; a transmission control unit to control transmission from a transmission side to the reception side using the reception error information; an error detection unit to detect transmission error on transmission from the reception side; an error notification unit to notify the reception side of the transmission error when the transmission error is detected; a control information embedding unit to embed control information that is used for controlling communications from the reception side, in a normal communication data without changing a format of voice code data in a voice communication, wherein the control information that is obtained on the reception side is information that shows a condition of a communication line from the transmission side to the reception side, wherein the error detection unit detects, when communications are implemented by embedding other optional data in main communication data in communications from the transmission side to the reception side, an error of communication data, and wherein, when the error of communication data is detected due to a condition of the communication line, the control information embedding unit embeds information about the error detection as the control information; and a normal data reception amount monitoring unit to monitor a reception amount of the other optional data before the error of communication data is detected, wherein the control information embedding unit further embeds a normal data reception amount in addition to the information about the error detection when the error of communication data is detected.