Features:
It is a 8 channels GSM Gateway that has 8 ports FXS interfaces.
It can connect with ordinary telephone set,PBX or VOIP Gateway,call back system etc.
Dialing tone frequency:450hz
Employ Industrial module (sim300) to make
SIM card supported (1.8V, 3V)
Caller ID display
DTMF Dialing
Bell signal
Polarity reversal
The RJ-11 socket which connect the phone or billing system for metering purpose
Antenna socket (SMA)
IP Presetting.
Working status indicator
Signal Strength indicator

Technical Specifications
Air interface standard:GSM850/1900Mhz,900/1,800Mhz phase 2+ full band
Frequency ranges:
GSM 1900:
I) Transmission:1, 930 ~ 1, 990MHz

Ii) Reception:1, 850 ~ 1, 910MHz
B) GSM 900:GSM 1800:
I) Transmission:890 ~ 915MHz          I) Transmission:1, 710 ~ 1, 785MHz              
Ii) Reception:935 ~ 960MHz            Ii) Reception:1, 805 ~ 1, 880MHz
Phone interface:Supply RJ-11 Phone Interface
Hanging voltage:45V
Picking off voltage:30mA / 41mA
Dialing tone Frequency:450Hz
Antenna interface:Antenna amplifying>1.5db
Sensitivity:<-104DBM
Transmitting power<3W
Adapter interface:INPUT:AC 175~260V
OUTPUT:+12V/1000MA

Operation Circumstance:
Operation temperature:-10c~60C
Storage temperature:-20C~70C
Operation humidity:45%-95%
Atmosphere pressure:86-106Kpa
Environment noise:<60DB
Transmitting Power:2W
Sensitivity:<-104dbm
Antenna Amplifying:>1.5db
Dialing frequency:450Hz
Hanging voltage:45V
Picking current:30mA/41mA