Product features: Use: VoIP-capable indoor station for hands-free talking, HTTP control functions / SIP call: on function keys, number of acoustic call distinctions: 4 (of which up to 2 from outdoor stations), voice transmission: hands-free / two-way communication, can be activated, number of selectable ring tones: 13 automatic hands-free talking after internal call: can be activated, privacy lock: yes, automatic call deactivation: yes, ringtone deactivation: on call-OFF button, ambient lighting: on light switch button, ringtone volume: adjustable, call volume: adjustable. Extended features: Door opener function: on door opener button, Light switch function: on light button, Internal call: can be activated, Automatic door opener: can be activated, Call forwarding: can be activated, Floor door opener function: can be activated, Additional connections: Floor button, LED (red): Ring tone deactivation, LED (green): Door and internal calls (short-term storage), busy indicator, Functionally expandable: Radio signal device, Mounting type: Surface mounting on flush-mounted box, Housing shape: Surface-mounted housing, Housing material: Plastic (ASA), Housing color: white, Base: can be pre-installed with plugged screw terminal, Number of wires: 6-wire required Installation mix audio, video, access in one system: possible Error display: optical / acoustic (sum error display on both LEDs), Commissioning and configuration: manual, with service device, with configuration software. AUDIO SPECIFICATION: Protocols: IPv4, TCP, UDP, CHCP, HTTP, HTTPS, SIP 2.0, RTP, Syslog, ICMP, ARP, Audio code: G.711a/µ, Audio transmission: Full duplex, Echo compensation: yes, Automatic gain control: yes. TECHNICAL DATA: Technology: Ethernet, LAN interface: IEEE802.3u 10/100BASE-TX/s, Auto MDIX, Power supply: PoE IEEE802.3af / screw terminal 18-30 V DC, Surface-mounted housing HxWxD mm: 105x94x17, Permissible ambient temperature: -5 to +40 degrees C, Protection class: IP20