... and PSTN switchLanguageEnglish,ChineseFunction Keys4 soft keys, 8 Line keys6 Navigation keys(Arrow button, OK button, C ... 9 Level Volume AdjustmentCall ProcessingLine Status Indicator Multi AccountCall Waiting, Call Queuing, Line SwitchingCall Forward, Call Transfer, Call ... Phone/HTTP/Auto-provisionDebug: Telnet/Phone/WebPower SupplyPSTN line can work under no external power supplyPower adapter:AC100 ...