1,8 channel-64 sims gsm gateway 2,IMEI change automatically 3,Call termination 4,automatic rotate(8ports64SIMcards) 5,SIP Key features:-GSM ... ,SIG3 and SIG2 and SIG1 LED is on LED Indicating (from the left to the right): Function For Avoiding SIM blocked ... answer incoming call,Auto hang up after 3-4 seconds 5,Auto send SMS,the SMS content can be setted. Auto ...