Akuvox R20BX4 On-Wall 4-Button SIP Video Door Phone

Four flats, one front door, and no room for a large panel: that is the job of the Akuvox R20BX4. Its four call buttons sit in a column, each beside its own name plate, on a front of 185 × 84.5 mm, small enough for the side of a building door or the pillar of a gate.

Visitors see who they are calling by name, and the flat they choose answers on its Akuvox indoor monitor, a SIP desk phone or the SmartPlus app, seeing them through the 2MP camera. The lens covers 110° by 58°, video runs at up to 1080p and 30 fps, and infrared night vision with a light sensor handles the evening and the dark stairwell entrance.

The building's own access cards keep working: 125 kHz EM cards and 13.56 MHz Mifare and DESFire cards are both read, and Android phones open it over NFC. It stores 4,000 users and 20,000 cards. Two relays are enough for the building door and a parking gate, two inputs take exit buttons, and RS485 or Wiegand link it to an access control panel. An ONVIF stream lets the building NVR record the entrance.

The front is aluminium alloy, rated IP65, -30 °C to +60 °C, and powered over one 802.3af PoE cable. This is the on-wall build; a flush back box and rain covers are available. With five homes, choose the R20BX5; with three, the R20BX3.