function :

1)  GSM 850MHz 900MHz 1800MHz 1900MHz / CDMA 800MHz/WCDMA(Optional)

2)  standard RJ-11 to telephone or voip gateway & PABX

3)  450Hz Dial-tone and Busy-tone

4)  50V in idle and 75V in ringing and 9-12V in talking

5)  DTMF detector in RJ-11

6)  precise reverse polarity

7)  caller id (DTMF,ONE RING) to telephone or voip gateway & PABX

    caller id (FSK) to telephone or voip gateway & PABX(Optional)

8)  1 CHL / 4 CHL / 8 CHL/ 16 FWT

9)  1 number calling in, then 8 GSM receiving

10) CLIR(Calling Line Identification Restriction)

11) single-handed power switch

12) LED indicating Hook On/Off,Talking,signal intensity,Power On/Off

13) set dialing delay time

14) talking DTMF Automatic dialing to GSM & to voip gateway & PABX(Optional)

15) SPK & MIC volume regulate

16) provide accumulator charger (Optional)

17) 4SIM automatic rotator (8 CHL 32 SIM cards)(Special Optional)

      - rotator by really clock(4 time oclock)

      - rotator by dial times

      - rotator by total talking minutes

      - rotator by working hours

18) IMEI changing (Special Optional)