VoIP-capable built-in door loudspeaker for up to 4 residential units. Four integrated button inputs, can be combined with up to 8 built-in bell button extensions, each with 32 button inputs (ASI31000-0000), microphone can be moved 25cm away for decoupling, connection of bell button modules from the AMI series (Art. AMI1091x-00xx), via 4-pin connector, relay output for switching functions, support of network actuators via HTTP, triggering of switching functions via DTMF, can be integrated behind on-site front panels, peer-to-peer capable, full-duplex VoIP hands-free calling, acknowledgement and error tone output, visual error display, adjustable talk time, optional automatic call acceptance, firmware updates via network using configuration software, RJ45 Ethernet connection with PoE support. LAN interface: IEEE802.3u 10/100BASE-TX/s, Auto MDIX, RJ45 connection. Supported protocols: IPv4, TCP, UDP, DHCP, HTTP, HTTPS, SIP 2.0 (UDP), RTP, Syslog, ICMP, ARP. Audio codecs: G.711a/. Audio transmission: full duplex, echo cancellation, automatic gain control. Power supply: PoE IEEE802.3af <1W, screw terminal 18-30V (DC) <1W. Interfaces: LAN (RJ45), 1x screw terminal power supply (+/-), 1x screw terminal relay output, 1x screw terminal for 2x2 button matrix, 4-pin connector for AMI extension. Controls: error display LED, status LEDs for network. Mechanical properties: Permissible ambient temperature -25 degrees C to 60 degrees C. Dimensions H79mm x W112mm x D34mm