SZRUNSUN GSM gateway:
2)IMEI auto rotate, auto update IMEI number
3)Support Remote update program
4)Call termination and Origination
5)standard RJ-11 (FXS) to telephone or voip gateway & PABX
6)Provide accurate anti-polarity signal,Precise reverse polarity
7)Caller ID
-Callback Function
-Support DTMF;  2nd Stage Dialing
8)Can dial number including * #.
9)-Can set dial speed, quck dial and slow dial.(dial delay time)
10)Support CLIR (calling line identity restriction)
11)Forbid incoming call
12)Set IP number before the number
13)Set the number can not be dialed
14)Set rapid reaction when detecting busy signal
15)Lock network, lock pin
16)Can set auto dial till connect call
17)Number replacement
18)Can dial "00" to "+"
19)Black list and white list
20)Set the talk minutes or call time