Different telecom networks offer advantages in different aspects. Today’s businesses expect the specific benefits from each of these networks. The ISDN and GSM are two such omni-present networks. Most of the establishments have access to both these networks and need to bridge and interconnect them. This allows them to dynamically select one of the networks on per-call basis for obvious benefits of cost and quality of service (QoS).

Matrix SIMADO GBR is one such gateway equipment offering interfaces for four GSM and two ISDN BRI ports. It can be used with any brand of existing PBX or even in a stand-alone mode. SIMADO GBR supports flexible and intelligent Least Cost Routing (LCR) options providing significant cost savings and round-the-clock connectivity.

Let Matrix SIMADO GBR add a competitive edge to your business by reducing telephone costs!

Matrix SIMADO GBR is a gateway to interface GSM and ISDN BRI networks. On the GSM side, it supports 2G Quad-Band operation and 3G Tri-Band operation, allowing it to work with any GSM/3G network. The ISDN BRI port supports both TE and NT modes. Incoming calls on GSM ports can be routed on BRI TE or BRI NT and GSM ports. Outgoing calls from NT are routed either on GSM ports or on BRI TE ports depending on the least cost routing logic. It can handle calls on all the ports simultaneously allowing full traffic on all the ports.

Existing PBX users can avail the benefit of the low-tariff of GSM networks by connecting SIMADO GBR with the PBX without changing their existing infrastructure. The users continue to make and receive calls without worrying on which network their calls are routed. Matrix SIMADO GBR routes the calls either on ISDN or GSM network depending on the dialed destination numbers and on the type of routing option selected by the users. In addition, SIMADO GBR can also be used without a PBX in stand-alone mode by connecting ISDN terminals directly on the NT port.

Intelligent and flexible routing is the forte of the SIMADO GBR. Various Least Cost Routing (LCR) schemes are offered. The elaborate routing algorithm encompasses different attributes like Port, Calling Number, Called Number and Time. It selects the most cost-effective route for a given number at specified time. In addition, it allows the flexibility of reserving ports for important users. Numbers received from calling network are converted by Automatic Number Translation (ANT) to match with the destination network.

The SIMADO GBR is very easy to install and operate. Jeeves is a Windows based multi-lingual GUI tool used to configure various parameters. The SIM cards can be accessed after removing its top cover. Antenna mixer (4 to 1) is built-in and hence only single antenna is required. The SIMADO GBR can be mounted on a wall or a table-top.

Application Diagrams

SIMADO GBR/SIMADO GBR 3G Stand-Alone Application
SIMADO GBR/SIMADO GBR 3G Stand-Alone Application
SIMADO GBR/SIMADO GBR 3G (TE) with PBX (NT) Application
SIMADO GBR/SIMADO GBR 3G (TE) with PBX (NT) Application
SIMADO GBR/SIMADO GBR 3G (NT) with PBX (TE) Application
SIMADO GBR/SIMADO GBR 3G (NT) with PBX (TE) Application

Key Features

3G Network Support

Matrix SIMADO GBR 3G offers accessibility of 3G networks for Voice communication. It supports Quad-band for 2G Network and Tri-band for WCDMA Network. It supports fallback compatibility and hence offers flexibility to access any available network. Users are always assured for connectivity using the alternate network in case the preferred (3G) network signal is weak or unavailable. With 3G power, an organization experiences Noise-free, Stanch and Crystal Clear Voice Quality, Enhanced Security and Utmost Coverage.

Allowed and Denied Lists

Allowed and Denied Lists are used to restrict dialing of long-distance and international numbers. A number is blocked if its prefix matches with any entry in the Denied Lists. On the other hand, a number is allowed to go through if it matches with any entry of Allowed List. This provides flexibility of allowing only specific numbers while blocking all others.

Automatic Call Distribution

The SIMADO GBR offers different schemes to select destination port for an incoming call. They are First Free and Round Robin.

Automatic Number Translation

The SIMADO GBR modifies the incoming number or part thereof so that it matches with the numbering plan of the destination network. The GSM networks require dialing of complete numbers including the area codes. If a caller has dialed just the local number, the SIMADO GBR adds area code as appropriate prefix.

Call Detail Recording (CDR)

The SIMADO GBR stores up to 200 calls made through the gateway in its internal memory. Reports can be generated on the COMM port using filters like Port, Number, Date, Duration, etc.

Call Duration Control (CDC)

Duration of each call made through SIMADO GBR can be controlled. When the duration of a call exceeds the set time limit, the call is forcefully disconnected. This feature can also be used to release ports that are left open accidentally.

Call Progress Tones

Call Progress Tones like Dial Tone, Ring Back Tone and Busy Tone can be selected to match with the tones used in the region or the country standard where SIMADO GBR is installed.

Caller Line Identification Presentation (CLIP)

The SIMADO GBR supports CLIP on GSM and BRI ports.

CLI Based Routing

The SIMADO GBR can route the call based on the calling party number. This allows routing certain callers to specific ports directly.

Compact and Sturdy

The SIMADO GBR is all-integrated gateway equipment. It can be easily installed on a wall or a table surface.

Day Light Saving

The Real Time Clock (RTC) of the SIMADO GBR moves forward or backward automatically in tune with the Day Light Saving requirements of the country, where it is getting installed.

Emergency Number Dialing

SIMADO GBR allows user to dial emergency numbers for services like Police, Fire Brigade or Ambulance without SIM or without network registering. Maximum 4 emergency numbers can be programmed.

Fixed Number Dialing

Pre-configured number can be dialed out as soon as a call lands on a port. This allows point-to-point connectivity without the repeated need of dialing the same number.

International Mobile Equipment Identity (IMEI) Number

International Mobile Equipment Identity (IMEI) number provided on Matrix SIMADO GBR GSM engine is a unique 15 digit code to identify an individual GSM port. This number can be used to associate the GSM port with a particular GSM network.


Jeeves is a Windows based GUI software tool for programming the SIMADO GBR. It is intuitive, user friendly and supports many languages like English, French, Spanish, German, Russian, Portuguese and Italian

Least Cost Routing (LCR)

The SIMADO GBR selects a port that is offering the least cost for an outgoing call. It supports LCR algorithms based on Time and Number. Port-wise LCR logic not only differentiates between GSM and BRI ports, but also selects the most cost-effective among GSM ports. Thus, each call can be routed on the most economical route

LED Indications

Total 8 dual color LEDs are provided to indicate current status of calls on GSM and BRI ports. Four LEDs-one for each GSM ports and four LEDs showing status of each B-channel of two BRI ports are provided.

Network Selection

Each GSM port can be programmed to work only with a few selected networks preventing a GSM port from registering with an overlapping but costly network. This flexibility is very useful when SIMADO GBR is installed near a state or national border.

PCM-TDM Platform

The SIMADO GBR uses digital switching platform based on PCM-TDM concepts. This architecture provides better speech quality and higher noise immunity.

Port Status

The SIMADO GBR monitors availability of all the ports. If a port is not available for any reason, SIMADO GBR routes the call on the next best-fit port.

Remote Programming

It is possible to change the configuration of the SIMADO GBR from anywhere in the world. System engineer can call on GSM, BRI TE or BRI NT ports and by dialing password he can enter into programming mode to change any configuration.

Returned Calls to Original Caller (RCOC)

The SIMADO GBR maintains records of all the unsuccessful calls on GSM network due to No Answer and such conditions. When such a call is returned, it routes the call to the original caller.

Speech Gain

The SIMADO GBR allows user to set receive and transmit gains of GSM port to improve quality of speech.

Time Zones

Call routing can adapt to different routing needs during day time, lunch time and night hours. Four different time zones can be programmed and each port can be programmed to behave differently in each time zone.

Universal Routing

A call received on a GSM port can be routed on any channel of BRI ports or even another GSM port. Similarly, a call received on any BRI channel can be placed on a GSM port or even another BRI channel.

Features List

Software Features

Allowed-Denied Lists Automatic Call Distribution
Auto Port Sensing Automatic Number Translation
Call Detail Recording (CDR) Call Duration Control (CDC)
Call Progress Tones CLIP
Dialed Number Based Routing Emergency Number Dialing
Fixed Number Dialing International Mobile Equipment
Identity(IMEI) Jeeves (Windows based Multilingual GUI Tool)
Least Cost Routing (LCR) Network Code Display
Network Selection Password Protection
Remote Programming Speech Gain Setting
SIM PIN Universal Routing

Hardware Features

3G Network Support (SIMADO GBR 3G) Quad-Band Support
Compact and Sturdy Design RS232C (COM) Port
Digital Switching Platform (PCM-TDM) Real Time Clock (RTC)
LED Indications Wall and Table-top Mounting

Technical Specifications

GSM Port

GSM Band
  • Quad-Band: GSM850, EGSM900, DCS1800, PCS1900
  • Tri-Band: WCDMA 850/1900/2100 MHz
Compliant ETSI GSM Phase2/2+
SIM Card One SIM per GSM Port
SIM Interface 1.8V, 3V
Transmission Power
  • Class 4 (2W) at GSM 850 and EGSM900 MHz band
  • Class 1 (1W) at DCS1800 and PCS1900 MHZ band
  • Class 3 (0.25W) at WCDMA 850/1900/2100
RF Sensitivity
  • Better than -106dBm at GSM850/EGSM900/DCS1800/PCS1900
  • Better than -106dBm at WCDMA 850
  • Better than -108dBm at WCDMA 1900/2100
External Antenna
  • 3.0dBi, 50W, SMA (Male) Connector, Omni Directional with cable of 3 meters length
  • 2.5dBi, 50W, SMA (Male) Connector, Fixed Omni Directional Swivel Antenna
Speech Gain
(Transmit and Receive)

BRI Port

Channels 2B+D
Personality NT or TE (User Programmable)
Signaling ITU I.430, Q.921,Q.931
Interface S/T Interface, Point to Point and Point to Multipoint
Connection RJ45 (120W)
Call Progress Tones Programmable
Rs232 (COMM) Port DB9 Male
LED Indications
  • GSM - 1 LED per Port for Network and Call Status
  • BRI - 2 LED per Port for Each B-channel Status

Power Supply

Input 12VDC @2A Through External Adaptor (90-265VAC, 47-63Hz)
Power Consumption 10W (Typical)
Connector DC Power Jack


Dimensions (W×H×D) 20.0×28.3×6.0 cm (7.9"×11.1"×2.4")
Unit Weight 1.5kg (3.3lbs) Approx.
Shipping Weight 2.5kg (5.5lbs) Approx.
Material ABS Plastic
Installation Mounting Wall and Table-Top


Operating Temperature -10°C to +50°C (-14°F to +122°F)
Storage Temperature -40°C to +85°C (-40°F to +185°F)
Operating Humidity 5-95% RH (Non-Condensing)
Storage Humidity 0-95% RH (Non-Condensing) at 40°C

Matrix SIMADO Range of GSM Products

SIMADO GDT11 GSM FCT for Data Applications with 1 GSM Port and 1 RS232C Port
SIMADO GFX11 GSM FCT for Voice Applications with 1 GSM Port and 1 FXS Port
SIMADO GFX11 3G GSM FCT for Voice Applications with 1 GSM Port and 1 FXS Port with 3G Support
SIMADO GFXD1111S GSM FCT Router for Voice and Data Applications with 1 GSM Port, 1 FXO Port 1 FXS Port and 1 RS232C Port
SIMADO GFXD1111S 3G GSM FCT Router for Voice Applications with 1 GSM Port, 1 FXO Port 1 FXS Port and 1 RS232C Port with 3G Network Support
SIMADO GFX44 GSM-FXS Gateway with 4 GSM Ports and 4 FXS Ports
SIMADO GFX44 3G GSM-FXS Gateway with 4 GSM Ports and 4 FXS Ports with 3G Support
SIMADO GBR21 GSM-ISDN BRI Gateway with 2 GSM Ports and 1 ISDN BRI Port
SIMADO GBR21 3G GSM-ISDN BRI Gateway with 2 GSM Ports and 1 ISDN BRI Port with 3G Support
SIMADO GBR42 GSM-ISDN BRI Gateway with 4 GSM Ports and 2 ISDN BRI Ports
SIMADO GBR42 3G GSM-ISDN BRI Gateway with 4 GSM Ports and 2 ISDN BRI Ports with 3G Support
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