- RS232,AT command,SMDR (call log.) - Connected to PBX,VOIP,Cordless phone - Auto IP prefix access code - In coming / Out going call - Call waiting / Conference (**) - Caller ID (FSK or DTMF) - Reverse Polarity/ barring in call - Signal strength indicator Specification : Quad GSM band : 850/900/1800/1900Mhz 3G/UMTS/WCDMA : 2100Mhz Supported SIM card : 3V only Weight/Dimension : 270g/170x113x38mm (L*W*H) Working Temperature : -10c~+50c Input power (V) : 100V-240V/50Hz-60Hz Operation Voltage : DC12V/1A (Standby : 0.2A, Talk : 0.35A - 0.50A) Telephone interface : RJ-11 (Loop start, DTMF, FXS)