Multiple dwelling house interphone system

A multiple dwelling house interphone system comprising:

• a collective entrance machine installed at an entrance for a visitor to call a dweller;
• a dwelling room master device installed in each dwelling unit for responding to the call from the visitor by the dweller;
• and
• a management master device installed in a manager room to speak with the visitor or the dweller, wherein
• the multiple dwelling house interphone system has a reception mode in which a call to any dwelling unit from the collective entrance machine is uniformly transmitted to the management master device, and
• the management master device includes:
• a forwarding button that re-forwards a call in the reception mode to an original calling destination;
• and
• a forwarding control section that re-forwards the call to the dwelling room master device of a dwelling unit as the original calling destination when the forwarding button is operated in a state where a speech path is formed with the collective entrance machine in response to the call forwarded in the reception mode.