Product name: 8 ports GSM gateway
Frequencies: GSM850/1900MHz, 900/1800MHz
Imei changing by handset/telephone keybaord in unlimited times...Connnect to VoIP gateway/pabx/asterisk

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 (SIM340) 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:
A) GSM 850 GSM 1900:
I) Transmission: 869.2 ~ 893.8MHz I) Transmission: 1, 930 ~ 1, 990MHz
Ii) Reception: 824.2 ~ 848.2MHz 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

Package:
Product dimension: L455x W280 x H45mm
Gift box dimension: L510x W170x H64mm
G. W: 4.5kg