Voltage: 110V This SOHO-PBX SP-208 system is an ideal telephone system for small offices and home offices. Easy to install and use. Direct or Indirect Dialing Mode. Automated Attendant Mode AND Operator mode. Call hold, transfer,Caller ID (FSK/DTMF/Bellcore). Three-way conferencing. Intercom call--Make internal calls from any extension. Facsimile supported--Any extension can hook up a fax machine or a PC to send or receive facsimiles. Incoming call alert Toll restriction scheme--Long Distance or International Direct Dialing can be disabled on a per extension basis. Secretary assisted dialing Limit CO line call duration Power failure tolerant Do not disturb--Extension with 'do not disturb' turned on will not ring. No response from caller under Auto-attendant mode. CO line ports can be disabled or enabled individually. Flexible Ring delay on incoming calls. Flexible extension number plan. Recording Outgoing Greeting Message (OGM). Playback OGM--User can listen to the recorded OGM or the on-hold music. CO Line ringing assignment.