House intercom
A house intercom is an internal telephone connection from room to room, from apartment to apartment, or from the front door of a house to an apartment.
A house intercom system is usually used at the entrance door for access control .
Devices are now also available that contain a digital camera and a small screen on the opposite side. This means that the conversation partner can also be seen.
To install an intercom system can mostly on wire lines be drawn, what expensive than a radio transmission is.
House intercom systems are not barrier-free : the hard of hearing and deaf people who rely on lip reading cannot operate such systems; Contents are not understood, lip reading is not possible even with an existing screen, since the image quality is usually too low for lip reading.
House intercom outside
House intercom inside
