... -64 sims gsm gateway 2,IMEI change automatically 3,Call termination 4,automatic rotate(8ports64SIMcards) 5,SIP Key features:-GSM 850MHz ... 1800MHz 1900MHz-IMEI auto rotate,auto update IMEI number-Call termination-standard RJ-11(FXS) to telephone or voip gateway&PABX ...