Thông tin kỹ thuật Max CO Lines : 640 Max Analog CO's : 640 Max VoIP (H.323) trunks : 32 Max VoIP (SIP) trunksNot Supported Max Total Extensions : 960 (1120 using DXDP) Max Analog Proprietary Extensions : 320 Max Single Line Telephones : 960 Max Digital Proprietary extensions : 512 (640 with T7600, DT300 series) Max IP Proprietary Phone extensions : 640 Multi-Cell Wireless Compatibility : Yes Maximum Cell Stations (Antennas)Up to : 128 Maximum Portable Handsets : 256 ( 512 with memory expansion card) Maximum Doorphones: 64 Centralized Voicemail : Yes, with KX-TVA Voice Mail Systems Direct Station Select (DSS) Consoles : 64 Dimensions (H x W x D)16.3" x 16.9" x 10.6" (per shelf) Weightunder : 35 lbs (per shelf) Warantys: 12 month