Extension Users:100 Concurrent Calls:30 Conference Room:20 Ports Type:GSM PSTN WCDMA Analog Ports 8 Supported Module:2GSM 4GSM 2FXOS 4FXO 4FXS 2WCDMA 4WCDMA VOIP Trunk:Unlimited SDRAM:1GB DDR3 Memory (default):8GB SD card Certificate:CE, FCC, ISO9001, RCM