Patent attributes
A multiple dwelling house interphone system includes a collective entrance machine and dwelling room master devices. When a calling operation section is operated and a dwelling unit number of a calling destination is input, a master device speech control section of the dwelling room master device of the dwelling unit including a plurality of dwelling room master devices performs a calling control of transmitting a call signal to the dwelling room master device of the calling destination having its master device ID, and subsequently forming a speech path when a response operation of the dwelling room master device of the calling destination is performed. The calling and speaking to the other dwelling unit are allowed even in a state where another dwelling room master device of the dwelling unit itself has formed a speech path with the dwelling room master device of the other dwelling unit.
