... phone directory 3.Private phone directory 4.Clear Voice Dual-module IP PHONE 1.Technical Features:ItemHA6966TI(LCD)-31(IP) ... , *IEEE 802.1XCodecG.723.1 , G.729 A/B , G.711 A/U , G.722QoSTOS,Jiffer Buffer,VAD,CNG,G.168 ... , Voice Prompt, Voice MessageBLF, BLAExpansion InterfaceEXT: ESM32 programmable Key module*USB portApplicationSupport PSTN and VoIPPublic phone directoryPrivate phone directory* Built ...