INTERPHONE MASTER UNIT HAVING RECEIVED CALL PATTERN DETECTION FUNCTION

PROBLEM TO BE SOLVED: To provide an interphone device that allows a specific guest to simply select and make a predetermined action while security is being ensured.SOLUTION: An interphone master unit 3 comprises a control part 310 that detects a call pattern of a call button 105 of an interphone slave unit 1, and a call pattern registration part 311 that stores an action corresponding to the call pattern, so that a corresponding predetermined action is triggered when the call button 105 is pressed in a specific pattern. In this manner, only specific guests such as family members and supporters who know the call pattern of the call button 105 can simply select and make a predetermined action, without recognizing that other operations than calling the interphone master unit 3 are possible.