- 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- Vikings proprietary VOX switching eliminates the need for Push to Talk mode- Selectable auto-answer feature for monitoring- Compatible with Polycom multicast paging- Built-in high ef