... PHONE 1.Support PSTN and VoIP 2.Public phone directory 3.Private phone directory 4.Clear Voice Dual-module IP PHONE ... , Hands-free,Mute,Headset,Message,MenuDirectory,Service,Hold,Redial, Conference, TransferVoIP protocol SIP 2.0Network ProtocolHTTP , BOOTP , FTP ... Key module*USB portApplicationSupport PSTN and VoIPPublic phone directoryPrivate phone directory* Built-in browser to access the ...