Features: ► SIP (RFC 3261) compatible ► Night Ringer function ► Plays audio from multicast ► Web-based configuration ► Paging prioritization and background music ► Web-based firmware upgradeable ► External volume control ► Small footprint ► High efficiency speaker driver ► PoE 802.3af Enabled (Powered-over-Ethernet) ► IGMP l SIP endpoint or multicast group member ► Network-adjustable speaker volume ► Peer-to-peer capable ► Can drive one ext. analog speaker for more volume