VALCOM VIP-172AL-VRSS IP INTERCOMSIP doorphone with door/gate relayPower over Ethernet (PoE) compatibleUse with Cisco, Nortel, Avaya and most modern IP telephone systemsCall button calls any SIP address or any Valcom GatewayAutomatic talkback VOX operation (no push to talk button needed) Includes long line extenderup to 300 meters between network interface and door speakerEasy, RJ45 plugin connectionStainless steel, brass and vandalresistant (11 gauge steel) Companion to IP CCTV camerasSIP or multicast communicationsLED status indicatorWeather and tamper resistantCompatible with secure networksSupervision with alert functionsDHCP addressableHigh survivabilityno server needed