Valcom IP Intercom SIP doorphone with door/gate relay For use with Cisco, Nortel, Avaya, and most modern IP telephone solutions Call button calls any SIP address or any Valcom Gateway Automatic talkback VOX operation Includes long line extender up to 300 meters Easy, RJ45 plug in, Cat 5 or 6, LAN/WAN 10/100 Stainless steel For security peer to peer or many to one Companion to IP CCTV cameras SIP or multicast softphone adressable Door ajar notification feature All call 1000's of unites with Valcom Gateway LED Status indicator Weather resistant and tamper proof Compatible with secure Supervision with alert functions Web based firmware upgradeable Web interface for control and setup DHCP High survivability no servers needed