... and PSTN switchLanguageEnglish,ChineseFunction Keys4 soft keys, 8 Line keys6 Navigation keys(Arrow button, OK button, C ... AdjustmentCall ProcessingLine Status Indicator Multi AccountCall Waiting, Call Queuing, Line SwitchingCall Forward, Call Transfer, Call Holding, Call Pickup, ... Phone/HTTP/Auto-provisionDebug: Telnet/Phone/WebPower SupplyPSTN line can work under no external power supplyPower adapter: ...