Modern organizations need access to omnipresent telecom networks like PSTN and the new-age internet telephony for the benefits of cost, convenience and quality. On the other hand, modern organizations with IP infrastructure cannot remain isolated from the PSTN. All such organizations need a multi-channel, transparent and flexible VoIP to PSTN gateway.

Matrix presents SETU VFXTH- The multi-channel SIP gateway offering seamless connectivity between VoIP and PSTN networks through multiple FXS and FXO ports. Matrix SETU VFXTH offers universal and transparent call routing irrespective of type of ports – VoIP-FXS, VoIP-FXO and FXS-FXO. Its superior call and signal processing capabilities ensure unrestricted flow of multiple calls with higher speed and better speech quality.

Let Matrix SETU VFXTH be your high-performance bridge to VoIP and PSTN networks.

SETU VFXTH is a family of multi-channel transparent and flexible VoIP to FXS-FXO gateways. On VoIP side, it supports SIP based IP interfaces allowing it to connect to any existing IP network. On the PSTN side, it supports FXS and FXO interfaces. SETU VFXTH supports universal routing facilitating calls between diverse port types. Further, intelligent Least Call Routing selects the most economical call route based on the destination number dialed on per call basis.

SETU VFXTH can register with multiple SIP Servers and IP-PBXs. Single SETU VFXTH can be used to interface with the enterprise IP-PBX for internal calls and public ITSP SIP Servers for international calls. Similarly on the PSTN side, few FXS/FXO ports can be used with the enterprise PBX while the other FXS/FXO ports can be interfaced with the PSTN for public calls.

SETU VFXTH offers extensive range of features including Programmable Access Codes, Allowed and Denies Numbers, Automatic Number Translation, CLI Based Routing, Emergency Number Dialing, Least Cost Routing, Peer-Peer Calling and CDR. On the network side it offers NAT/STUN, PPPoE, Fax over IP, Syslog debug, and others.

In summary, Matrix SETU VFXTH is one of the most flexible, feature-rich and dependable VoIP-FXS-FXO Gateways.

Matrix SETU VFXTH is available in following models:
VoIP-FXO-FXS Gateways
Sr. No. Model Name VoIP Channels FXO Ports FXS Ports
1. SETU VFXTH0808 16 8 8
2. SETU VFXTH1212 24 12 12
3. SETU VFXTH1616 32 16 16
VoIP-FXO Gateways
Sr. No. Model Name VoIP Channels FXO Ports
1. SETU VFXTH0800 8 8
2. SETU VFXTH1600 16 16
3. SETU VFXTH2400 24 24
4. SETU VFXTH3200 32 32
VoIP-FXS Gateways
Sr. No. Model Name VoIP Channels FXS Ports
1. SETU VFXTH0016 16 16
2. SETU VFXTH0024 24 24
3. SETU VFXTH0032 32 32

Application Diagrams

VoIP Gateway for Traditional PBX

SETU VFXTH helps an organization to integrate new communication technologies to its existing infrastructure. Using SETU VFXTH, a traditional PBX system can connect to VoIP networks. With new networks being integrated, communication happens using the most cost-effective networks. Features like Automatic Number Translation, Programmable Access Codes and host of other advanced functionality, enable users to access new networks without changing their dialing habits.
VoIP Gateway for Traditional PBX
SETU VFXTH can be connected to a traditional PBX in two ways. Firstly, the FXS ports of SETU VFXTH can be connected to the FXO ports of the PBX. On dialing prefix assigned in the PBX, the user can access these FXS ports to make VoIP calls. Secondly, the FXS port (SLT port) of the PBX can be connected to FXO port of the SETU VFXTH. PBX users can access VoIP network connected to SETU VFXTH by dialing the FXS port number of the PBX.

PSTN Gateway for IP-PBX

SETU VFXTH enables the IP-PBX users to make calls to the PSTN network. It assures users the most cost effective route of IP for all their calls to PSTN till the last mile of termination.
PSTN Gateway for IP-PBX
SETU VFXTH gets registered to an IP-PBX as a client. Registering multiple gateways to a single IP-PBX, allow the IP-PBX users to relay calls over IP and use the local fixed-line connectivity. Organizations operating widely in varied locations can significantly benefit from such a set-up.

Network Two TDM PBXs over the IP Network

Matrix SETU VFXTH helps an organization to network multiple locations over the IP network. SETU VFXTH forms the gateway to establish seamless connectivity between two locations, using existing PBX systems. Users can make calls to other location using standard telephony instrument connected to the PBX. Extensions of the PBXs can call each other directly without going to the operator. This also avoids the need of changing the habituated dialing habits, with the gateway taking care of it.
Network Two TDM PBXs over the IP Network
SETU VFXTH can be used for connecting multiple locations. It can be used for seamless calling by connecting FXO port of SETU VFXTH to FXS port of the PBX. When the extension of the PBX calls the FXS port of the PBX (connected to FXO port of SETU VFXTH), with the intelligent call routing mechanism, the call is routed to the SETU VFXTH at the other location over the IP network. Once the call reaches the other location the caller can call any extension of the PBX or access the local PSTN network to save long distance call cost.

Multi-Site connectivity

Matrix SETU VFXTH facilitates easy and low cost communication between geographically spread, multi-branch offices.
Multi-Site connectivity
A multisite connectivity can be established through the existing IP network. SETU VFXTH connects to existing infrastructure with its varied interfaces. SETU VFXTH located at various branch offices can be registered to the IP-PBX at the head office. This extends the IP-PBX connectivity to the various branch offices. SETU VFXTH can be connected to the local PSTN network via FXO interface. This allows all other registered users of the IP-PBX to access the local PSTN network where the SETU VFXTH is installed, reducing the call cost significantly.

Key Features

Allowed and Denied Numbers

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 in the Allowed List. This provides flexibility of allowing only specific numbers, blocking all others.

Automatic Number Translation

This feature allows the Gateway to translate the number string dialed by the user to a format compatible with the network through which the call is to be routed. So, the user can dial numbers freely without worrying about the network through which the call will be routed.

Call Progress Tones and Rings

The gateway offers flexibility of programming call progress tones and ring cadence to match the standards of the country of installation. Country Specific Call Progress tones like Dial Tone, Ring Back Tone, and Busy Tone etc. can also be programmed.

Caller Line Identification and Presentation (CLIP)

SETU VFXTH can provide Caller Line Identification Presentation (CLIP) on FXS ports. Analog CLIP protocols such as DTMF, FSK ITU-T V.23 and FSK Bellcore 202A are supported by the gateway.

CLI based Call Routing

A call can be routed to a fixed number from the CLI presented on SETU VFXTH. When a call lands on the network ports of the SETU VFXTH, it detects the CLI, verifies the CLI and routes the call to the predefined number.

Call Detail Record (CDR)

SETU VFXTH can store details of 2000 calls in its memory. Call reports can be generated using filters like source port, destination port, calling number, called number, date, time and duration.

Day Light Saving

The Real Time Clock (RTC) of the SETU VFXTH moves forward or backward automatically in tune with the Day Light Saving requirement of the country where it is installed. The options like Week-Day-Month or Date-Month are provided to move the clock forward and backward automatically on the specified day, date and time.

Fax over IP (FoIP)

The Matrix SETU VFXTH user can send and receive Fax over SIP account, when the FAX machine is connected to the FXS port. The SETU VFXTH supports FoIP using T.38 Vocoder and Pass-Through.


The gateway offers FXO port to connect the PSTN network and route incoming calls to VoIP network or the extensions. It can also be used to connect extension of a PBX to network two PBX over VoIP.

Network Port Parameters

Web Jeeves of SETU VFXTH provides a configuration menu to program its network port parameters to match the LAN addressing scheme of the installation site. Parameters such as IP address, subnet mask, connection type, etc., can also be programmed through a telephone instrument connected to the system.

Peer-to-Peer Calling

SETU VFXTH support VoIP calls, between two locations without going through a proxy server. Fixed IP addresses of various locations can be programmed in the Peer-to-Peer table of the gateway to avail this facility. The gateway supports 500 entries in the Peer-to-Peer table. Numerical dialing codes can be defined to simplify the calling between various locations.

PIN Authentication

The gateway uses PIN Authentication to verify a caller’s identity before routing the call from one network to another. It is an important feature that prevents unauthorized usage.

Prefix to Domain Name Conversion

This feature enables the conversion of a numerical code dialed by the user to a domain name. It helps the SIP service provider to understand and route the call to the required destination.

Remote Held/Transfer

The user of SETU VFXTH can keep a called person at remote end on hold or even transfer the call to a third person. This feature can be activated only if the device at the called end supports Call Hold/Call Transfer feature.

SIP Accounts

A maximum of 32 SIP accounts can be programmed and each FXS user can be assigned one of the SIP accounts for outgoing calls. Dynamic allocation of SIP account is also possible using the Dial Plan. These SIP accounts can be from multiple service providers or all from a single service provider.

Universal Routing

Universal Routing allows the gateway to route a call received from one network to another based on the routing mechanism programmed in the system. A source port can be programmed for more than one destination port so that if one port is busy, the call can be routed through another port.

VLAN Tagging

A Virtual Local Area Network (VLAN) may be defined as a group of LANs that have different physical connections, but which communicate as if they are connected on a single network segment. VLANs increase overall network performance by grouping users and resources that communicate most frequently with each other.

Web Based Programming

Matrix SETU VFXTH incorporates Built-in HTTP server and web pages for easy configuration. This Web based programming feature allows a user to configure the gateway from any part of the world, once connected to the IP network

Features List

Software Features

Allowed and Denied Numbers Fax over IP (T.38 and Pass-Through)
Attended/Blind Call Transfer Hotline
Automatic Number Translation MAC Cloning
Answer and Disconnect Signaling on FXS Port NAT and STUN Support
Answer and Disconnect Supervision on FXO Port PCAP Trace
Call Detail Record Peer-to-Peer Calling Table
Call Progress Tones PIN Authentication
Caller Line Identification and Presentation (CLIP) PPPoE
Conference Prefix to Domain Name Conversion
CLI on FXS Port Programmable Access Codes
CLI based Authentication Remote Held (SIP Accounts Only)
Date and Time Settings Remote Transfer (SIP Accounts Only)
Day Light Saving Mode Speech Gain Setting
Default the Configuration (System Default) Supplementary Services
Destination Number Determination Method - Call Forward
Destination Port Determination Method - Call Hold
Digest Authentication - Call Waiting
Do Not Disturb System Log Client
Dynamic DNS VLAN Tagging
Emergency Number Dialing Web based Programming

Technical Specifications

FXS Port Parameters

Signaling Loop Start
Connector RJ11
Off Hook AC Impedance 600Ω/900Ω/ Complex
Number of Long Loop Extension 4
Loop Limit 1800 (Max) Excluding Telephone set
On-Hook Voltage(Tip/Ring) -48V
Off Hook Current 25mA (Max)
Ringing Voltage Trapezoidal 60VRMS/25Hz and Sinusoidal 52VRMS/25Hz
Dialling DTMF and Pulse (10 PPS and 20 PPS)
DTMF Detection ITUT Q.24
CLI Presentation DTMF, FSK ITU-T V.23 and FSK Bellcore 202
Protection Over Voltage Secondary Protection
Return Loss >18dB
Longitudinal Balance >50dB
Transmission Level Adjust Tx Gain: -3dB to +6dB,
Rx Gain: -3dB to +6dB

FXO Port Parameters

Signalling Loop Start
Connector RJ11
Off Hook AC Impedance 600Ω/900Ω/Complex
Loop Limit 1200Ω
Pulse Dialling 10 PPS and 20 PPS
DTMF Dialling and Reception ITUT Q.23 and Q.24
CLI Reception DTMF, FSK ITU-T V.23 and FSK Bellcore 202
Protection Over Voltage and Over Current Secondary Protection
Return Loss >18dB
Longitudinal Balance >50dB
Transmission Level Adjust Tx Gain: -15dB to +10dB
Rx Gain: -15dB to +10dB
Call Maturity Delay and Polarity Reversal

VoIP Port Parameters

VoIP Protocols SIP v2, SDP, RTP (RFC 2833)
Network Protocol IPv4,TCP, UDP, DHCP, SNTP STUN, HTTP
SIP 32 SIP Accounts Out Bound Proxy Support
NAT STUN and NAT Keep Alive
Voice CODECS G.711 A-Law, µ-Law, G.723.1, G.729A, G.729B, GSM-FR, GSM-EFR
Line Echo Cancellation G.168 with 128ms Tail Length
Call Progress Tones Dial Tone, Ring Back Tone, Busy Tone, Error Tone
Voice Dynamic Jitter Buffer (Adaptive), Comfort Noise Generation and Voice Activity Detection
Fax T.38 and Pass-Through
Quality of Service Layer 3 DIFFServ and TOS
Data Network WAN Port RJ45 Auto MDIX 10/100 BaseT
Security Password Protected Administration
Physical Connector RJ45

Power Supply

Input 124V DC @2.5A
Power Consumption 60 Watts
Connector DC Power Jack
LED Indications 1 GREEN colour LED for Power, 1 Dual Color LED for Status, 32 Single Colour LEDs for each Port


Dimensions (W×H×D) 40.7 × 5.1 × 17.2 cm (16.0" × 2.0" × 6.8")
Unit Weight 1.610 Kg (3.54 lbs) Approx.
Shipping Weight 2.570 Kg (5.66 lbs) Approx.
Material Aluminium 1.5mm Powder Coated
Installation Mounting Table-Top, Wall and Rack Mount


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

Matrix SETU Range of VoIP Products

ETERNITY IP-PBX The IP-PBX with Universal Connectivity and Seamless Mobility
SAPEX All-in-One Embedded IP-PBX Server
VYOM CCX High-Density Universal Gateway
ETERNITY The Universal Telephony Gateway
SETU VGFX Multi-port SIP based VoIP to GSM-FXO-FXS Gateway
SETU VFXTH Multi-Port VoIP to FXO-FXS Gateway
SETU VFX SIP based VoIP Gateway with 4/8 FXS Ports, 1 FXO (PSTN Pass-Through) and 1 Ethernet Port
SETU ATA211G SIP based Analog Telephone Adaptor with 1 FXS, 1 GSM and 2 Ethernet Ports
SETU ATA211 SIP based Analog Telephone Adaptor with 1 FXO, 1 FXS Port and 2 Ethernet Ports
SETU ATA2S SIP based Analog Telephone Adaptor with 2 FXS Ports and 2 Ethernet Ports
SETU ATA1S SIP based Analog Telephone Adaptor with 1 FXS Port and 2 Ethernet Ports
SETU VP248PE Executive IP-Phone with 6 Lines x 24 Characters LCD Display and PoE
SETU VP248SE Executive IP-Phone with 2 Lines x 24 Characters LCD Display and PoE
SETU VP248P Executive IP-Phone with 6 Lines x 24 Characters LCD Display
SETU VP248S Executive IP-Phone with 2 Lines x 24 Characters LCD Display
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