- SIP doorphone with door/gate relay- Power over Ethernet (PoE) compatible- Use with Cisco Nortel Avaya and most modern IP telephone systems- Call button calls any SIP address or any Valcom Gateway- Automatic talkback VOX operation (no push to talk button needed)- Includes long line extender - up to 300 meters between network interface and door speaker- Easy RJ45 plug-in connection- Stainless steel brass and vandal-resistant (11 gauge steel)- Companion to IP CCTV cameras- SIP or multicast communications