VoIP-GSM gateway Polygator G8 – tech.sheet

Technical sheet

GSM-gateway with Voice and SMS-features based on OS Linux
A universal hardware platform for lowering calls costs and termination

Back view: SMA-connectors (female) for connecting antennas or combiner, PRI-port (option), COM-port, 2 USB-ports, 1 system USB-port (for applying firmware), Ethernet-port, DC 12V connector

Front view: holders for SIM-cards

Side view: perforated chassis with openings for passive cooling

General view: 1 antenna attached, 3 free SMA-connectors, USB-drive (operational system and software), USB Wi-Fi dongle





Multichannel VoIP/GSM gateway POLYGATOR G8


Metal chassis with passive cooling, 1 slot for installation of channel board (channel board for either 4 or 8 channels)



GSM channels

4 / 8 channels

Network types

Depending on package bundle:
2 bands (900/1800 MHz)
4 bands (850/900/1800/1900 MHz)
4 bands + 3G (WCDMA) (850/900/1800/1900 MHz + 2100 MHz) (option)

GSM modules

QUECTEL M12 (2 bands) or M10 (4 bands) or SimCom 5215 (4 bands + 3G, paid option)

Transmitter power

2 W (1 W)


Small plug-in, 3V

Antenna connector

SMA (female) impedance 50 Ohm

Channel board

4 either 8 GSM-channels with 1 SIM-card per channel, i.e. for installation of 4 either 8 SIM-cards.

It is possible to use almost unlimited quantity of SIM-cards by connecting external/remote SIM-bank.


Voice signaling


Voice channels quantity

4 / 8 channels

Codecs (hardware)

G.711 PCM at 64 kbps, G.729, G.723, G.726, DTMF support

SIM-cards management
SIM-server PolygatorFull protocol support, ready to be connected to existing systems based on SIM-server Polygator
External management protocolSet of commands for managing gateway via port 9005



SMPP v3.4, AT-command mode (GSM-module as Ethernet-modem), Email-to-SMS / SMS-to-Email, custom SMS-protocol (port 9005), SMS via Web-interface, script execution on SMS arrival (Web-hooks), i.e. executing HTTP-request to external address (CURL) with SMS-details as parameters

Other ways to work with SMS"SMS-client" software for port 9005

PRI/E1 (option)

E1 trunk module

May include one or two E1 trunks. 30 channels PCM, flow 2 Mbps standard G.703, G.704 ITU-T

Modulation type

HDB3; A-Law encoding, Master/Slave

PRI ISDN information

EDSS1 (Q.931), DTMF support. Connector RJ45


120 Ohm (standard)


Processor board

One Ethernet 10/100-Base T port, two USB-ports: 1st port – external Flash-memory, 2nd port – free / for WiFi or 3G-modem (optional). One COM-port (RS 232), one port PRI (option).



Angle-type antennas either discrete antennas (3m feeder) on magnetic base

Directional (option)

Amplifying YAGI-antenna with coaxial cable. Cable length: 10m (can be longer if needed)

Antenna combiner (option)

Channels quantity

4/8 channels

Directional antenna

Amplifying YAGI-antenna with coaxial cable. Cable length: 10m (can be longer if needed)

Connection losses

8–15 dB

Input connector type

SMA (female), impedance 50 Ohm

Output connector type

SMA (female), impedance 50 Ohm


Operating system

Linux 2.6.33 Kernel for ARM processor, OS BusyBox

Management software

Elgatos service – provides calls commutation and all gateway features. Web GUI – provides comfortable access to most features and controls, allows to manager gateway via WEB-browser SIP-agent SipUA – provides SIP-protocol implementation and connection to external VoIP/SIP-applications or to preinstalled on-board Asterisk

Additional software

Asterisk 1.6, VPN Client «OpenVPN», IP-Tables, web-server (thttpd)


Power supply standards

External power unit 12–19 V, direct current (DC), 4.5 А

Control features

LED indication

Remote control

TCP/IP (Telnet protocol): SSH via on-board IP/Ethernet: 10/100 Base-T, RJ-45


Dimensions without packing

21 x 11 x 4 cm

Net weight

1 kg

Dimensions with packing

48 х 15 х 8 cm

Gross weight with default bundling (i.e. with no options)

1.8 kg

Operating temperature

10–50 °C

Relative humidity

Below 95 % at 40 °C


Air-conditioned room, UPS, grounding