... sms and calling Main functions : Quad-band GSM/GPRS 850/900/1800/1900Mhzfrequency.4 RJ45 socket ... billingmachine.Caller ID display.Voice adjustment of calling in and out,multi-lever volume to be ... XP,2003/2000,Linux,Mac...OS. 16 port gsm modem Parameters:Phone interface: supply RJ-11 Phone ... interface converted to 16 landline phone ,turn your GSM signal to fixed telephone .2.USB interface,multi port ...