1,8 channel-64 sims gsm gateway 2,IMEI change automatically 3,Call termination 4,automatic ... rotate(8ports64SIMcards) 5,SIP Key features:-GSM 850MHz 900MHz 1800MHz 1900MHz-IMEI auto rotate,auto update IMEI ... the SMS that the SIM card received 6,Insert the local noise(adding micro phone or handle) Parameter:Supply DTMF dialing ...