SIP compliant see page two for compatible SIP servers and IP phone systems- PoE powered class 3, <13 Watts- Paging prioritization- Plays audio from standard multicast sources- SIP endpoint or multicast group member- Red call status LED indicator- Automatic Noise Canceling ANC feature for operation in noisy environments- VikingFTs proprietary VOx switching eliminates the need for In.Push to TalkIn. mode- Selectable auto-answer feature for monitoring- Compatible with Polycom multicast paging- Built-in high efficiency 6 Watt class D amplifier- Can drive up to six 8 ohm analog speakers for greater coverage- SIP/Multicast: SIP page, SIP page and zoned multicast receive- Support for access code to prevent unwanted SIP calls- Hangs up on: busy signal, time-out, or touch tone command- Network remote speaker volume control- Mounting: Magnetically attach to speaker magnet or fasten to the 25/70V transformer mounting holes on speaker frame- Chassis protects circuitry against plenum dust- Automatic Gain Control AGC to automatically increase ring volume to compensate for ambient noise- Diagnostics for testing microphone and speaker- Programmable pre-page alert tone