The ShoreTel ShoreGear 24A supports up to 24 analog extension ports. The ShoreGear 24A interfaces to standard analog telephones (FXS) including CLASS feature phones with Caller ID Name and Number and Message Waiting. Features and Specs include: • 2 - RJ-45 local area network (LAN) connectors • 1 - RJ-21X port for punchdown block, patch panel, or 12-port harmonica connector • 24 - analog extension ports (FXS) • 1 - RJ-11 port for connection to the extension side of the Power Fail Transfer Unit (Extension 9) • 1 - DB-9, RS-232C maintenance port for serial communications • 1 - 3.5 mm stereo input for connecting a music-on-hold source • 1 - 3.5 mm stereo output for connecting to an overhead paging system or night bell • Supports SIP trunks and SIP devices • Input Voltage100-240 VAC, 50-60 Hz • Power Consumption 2A max • Relative humidity 0% - 90% (non-condensing) • Operating temp: 32° - 144° F (0°-50° C) • 1.72 x 17.16 x 14.28 inches (43.68 x 435.86 x 362.71 mm) • 9 lbs. (4.08 kg)