- Ring with adjustable volume and cadence- Hearing aid compatible amplified handset with thumbwheel volume control- Optional RC-4A for secure remote relay control see DOD 582- SIP compliant- PoE powered (class 1 <4 Watts)- Outbound Proxy Authentication ID Peer to Peer VLAN Tagging- Network downloadable firmware- Cycles to up to three rollover phone numbers on busy or no-answer- Remotely programmable- Extended temperature range (-40F to 140F)- Selectable auto-answer feature for monitoring- Diagnostics (
