Description:? - Includes The X16 Voice Server Equipped For Connection To 4 Telephone Lines But Expandable To 6 Telephone Lines- Comes With Four X16 Digital Speakerphones But Is Expandable Up To 16 Telephones. These Are In The Fashion Color- Charcoal- Auto Attendant Answers And Processes Calls Voicemail Call Waiting Caller Id Cell Phone Like Navigation Keys - External Call Forward Live Call Recording Outgoing Call Log Personal Phone Book - Easy To See Blue And Green Hs Leds External Message/Music-On-Hold Interface- Includes Self-Install Modular Connector Package And Self Install Quick Start GuideXb202204ch