The ShoreTel Voice Switch 90v is a 1U half-width voice switch that supports up to 90 IP phones, 90 voicemail mailboxes, and up to a maximum of 12 analog ports (eight loop start trunks, and four analog extension ports). This switch supports integrated voicemail capability with 56 hours of voicemail storage. The ShoreTel Voice Switch 90v supports ShoreTel IP phones, softphones, and SIP devices The ShoreTel Voice Switch 90v interfaces to standard analog trunks using loop start or wink start signaling as well as to standard analog telephones including CLASS feature phones with Caller ID Name and Number and Message Waiting. Features and Specs include: 90 voicemail mailboxes with a total of 56 hours of voicemail storage • 2 - RJ-45 local area network (LAN) connectors • 1 - RJ-21X port for punchdown block, patch panel, or 12-port harmonica connector • 8 - loop start trunks (FXO) • 4 - telephone ports (FXS) • 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 a overhead paging system or night bell • Supports SIP trunks and SIP devices • Input voltage 100-240 VAC, 50-60 Hz • Power consumption 33 W (max) • Relative humidity 0%-90%, non-condensing • Operating temp: 32° - 144° F (0°-50° C) • 1.69 x 8.39 x 14.28 inches (43 x 213 x 378 mm) • 5.3 lb (2.4 kg)