... .Private phone directory 4.Clear Voice Dual-module IP PHONE 1.Technical Features:ItemHA6966TI(LCD)-31 ... button)Volume adjust, Hands-free,Mute,Headset,Message,MenuDirectory,Service,Hold,Redial, Conference, TransferVoIP protocol SIP 2.0Network ... , Voice MessageBLF, BLAExpansion InterfaceEXT: ESM32 programmable Key module*USB portApplicationSupport PSTN and VoIPPublic phone directoryPrivate phone directory ...