Viking’s K-1900-6-IP is a durable, attractive and easy-to-use VoIP SIP hot-line phone, capable of withstanding harsh conditions and abuse. The K-1900-6-IP is designed to call a number when the handset is lifted. Once the call is answered, two-way communication is established. If the first number is busy or doesn’t answer, up to four additional numbers can be dialed in a rollover sequence. The K-1900-6-IP is PoE Class 1 powered and VoIP SIP compliant. The K-1900-6-IP flush mounts to a standard double gang box. The built-in relay contacts of the K-1900-6-IP can be programmed to activate when the phone is taken off-hook or when a touch-tone command is entered by the called party. This is perfect for controlling lights and cameras or for activating a door strike or mag lock, granting the caller access to the facility.