VoIP hybrid IP PBX system, 124 number of trunks, QSIG digital networking allows basic call handling, closed numbering routing, CLIP / COLP / CLIR / COLR, automatic route selection / least cost routing, external sensor, door opener, reliable networking via T1 / E1 E&M, multi-cell wireless integration, mobile phone integration, PC-phone / PC-console, ISDN capability, advanced call center function, centralized voice mail, TAPI 2 CTI interface, 2 channel cell station to connect DPT interface port.