4Ports GSM terminal, FWT with 4 ports, can connect with PBX 4Ports GSM terminalFeatures:1. Using SIM card, 4 ... answering calls after connecting to telephone set3. Available to connect with telephone set, PBX, Billing machine, etc4. Caller ID5. Built ... , working status indicator, breakdown indicator, etc10. Can proceed with setting up and modification of parameters through the phone setTechnique ...