SIP compliant- SIP endpoint or multicast group member- SIP/Multicast: SIP page, SIP page and zoned multicast receive- Plays audio from standard multicast sources- Compatible with Polycom multicast paging- Red In.Page/StatusIn. LED indicator- Network downloadable firmware- Support for access code to prevent unwanted SIP calls- Network remote volume control- Paging prioritization- Programmable pre-page alert tone- Powerful 70V amplifier drives up to 250 Watt load- Door chime trigger input- Auxiliary and background music inputs- Individual and master volume controls- Bass and treble controls- LEDs show audio level and activity- Provides loud ringing- 600 Ohm output to drive additional amplifiers- Adjustable Automatic Level Control- Peak limiter and multiple protection modes