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Dual Universal Telephony Adapter (UTA)

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The Dual Universal Telephony Adapter (Dual UTA) is a comprehensive hardware device designed to interface and test the voice and data quality of telecommunication networks. The Dual UTA features all the circuitry necessary to universally adapt to any telephony instrumentation, such as standard Plain Old Telephone Systems (POTS), digital hybrid interfaces, Voice over Internet Protocol (VoIP) networks, wireless cellular phones and mobile radios including devices that utilize Bluetooth®, Broadband 3G/4G, LTE technologies.

As the name implies the Dual UTA contains a Side 1 and a Side 2. These sides are completely independent of each other so interfacing with endpoints of a single network or interfacing with two completely separate networks are plausible scenarios.

Used in conjunction with GL's VQuad™ software application, the Dual UTA simplifies end-to-end testing of voice, data, video quality, Echo & Delay measurements, and FAX in variety of networks, including Wireless (Bluetooth®, Wi-fi, 3G, 4G, LTE, PTT), VoIP, Analog, and TDM, practically allowing any end-point interfaces.

Hardware Interfaces

  • Wireless communication devices (Mobile phones, Smart phones (iPhone, Android), Military/Mobile radio, Bluetooth®, WiMax, WiFi, Broadband 3G/4G, LTE))
  • Mobile Phones:
    • Bluetooth™® – Works with all Bluetooth™® phones for both call control and send/record audio functions. Bluetooth™® also performs RSSI, Battery level functions, Network verification. Supports Bluetooth Wideband (WB) with 16000 sampling rate.*
    • Mobile audio interface for Smartphones (iPhone, Android) – includes Audio Headset Jack - 2.5mm (typical) for mobile phones, 3.5mm terminations for Smartphones (iPhone, Android)
  • Mobile Radios with Push-to-Talk (PTT) functionality: Provides radio keying and sends/records audio.
  • 2-wire Analog Simulation (RJ-11 FXO port) for connecting to ATA, PSTN, Switch Router
    • Detect dial tone, go off hook, CallerID detection, send digits (two stage dialing), answer calls, detect a variety of Special Information Tones (SIT), and much more as well as send/record audio for Voice Quality measurement. 
  • Handset Phones (POTS, Digital, VoIP): Replaces handset of any telephone (POTS, Digital, VoIP) that contains a coiled cord and handset 
  • Balanced I/O for connecting to a VoIP Softphone, Head and Torso Simulator (HATS), or any device supporting audio. 
  • Dual UTA 2-wire FXO or 4-wire analog interfaces supporting Fax testing 

Bluetooth® Wideband support requires newer generation DUAL UTA hardware and firmware upgrades. Contact GL for more details.


  • Send/Record audio for Voice and Data Testing, Echo Measurements over TDM, VoIP, and Wireless networks
  • Network One-way delay measurements. (collocated or geographically separated)
  • Network Round Trip Delay (RTD) measurements. (collocated or geographically separated)
  • Echo measurement and analysis using Echo Measurement Utility (EMU)
  • Automated Data Testing (NetTest) including TCP, UDP capacity, VoIP, Route, HTTP, FTP, DNS and SMS
  • Acoustic echo canceller testing
  • Automatic control of Push-to-talk phones/radios (key/unkey radio)
  • Ability to generate and receive T.30 faxes using the Dual UTA 2-wire FXO or 4-wire analog interfaces. Fax testing for additional interfaces such as T1/E1 and VoIP (T.38) are coming soon.

Dual UTA

Dual UTA Hardware Unit

The Dual UTA features all the circuitry necessary to universally adapt to any telephony instrumentation, such as

  • Mobile audio interface for Smartphones
  • Bluetooth™® (NB and WB)
  • RJ-11 POTS interface 
  • Handset interface  (POTS, Digital, VoIP)
  • Balanced I/O (VoIP, HATS,...)
  • GPS sync port

A GPS sync port on the Dual UTA permits precise time synchronization between two geographically separated systems as well as location information for drive testing. 

Physical Dimensions:

Height: 1.60 in. (40.64 mm)
Width: 5.55 in. (140.97 mm)
Depth: 7.45 in. (189.23 mm)
Weight: 1.72 lb. (.778 kg)

Power requirements:

Input Voltage: +5VDC (derived from USB bus)
Current load: 200mA

External Connections:

USB 2.0: Type B USB Jack (Communication with PC and Power)

3.5mm In/Out Jacks (Balanced Audio - Side 1&2 )

  • Input Impedance – 600ohms, 1000 ohms and User-Definable
  • Output Impedance - 600ohms, 1000 ohms and User-Definable

RJ-11 Jacks (FXO - Side 1&2 ) 

RJ-22 Jacks (Handset/Handset Base - Side 1&2 )

3.5mm (Monitor)

Dual RJ-45 Stacked Jacks (GPS In/Out and PTT - Side 1&2 )

  • PTT - Side 1&2 Input Impedance - 600ohms, 1000 ohms and User-Definable
  • PTT - Side 1&2 Output Impedance - 600ohms, 1000 ohms and User-Definable

Bluetooth Antennas - Side 1&2


CE, FCC, TBR21 compliant

Frequency Range Compliance:

FXO PCI card (VQT012)


Dual UTA FXO 2-wire interface (8K samples/sec)


Dual UTA FXO 2-wire WB interface (16K samples/sec)


Dual UTA Balanced, Mobile, PTT, Handset interfaces (8K samples/sec)


Dual UTA Balanced, Mobile, PTT, Handset WB interfaces (16K samples/sec)


Dual UTA Bluetooth interface (8K samples/sec)



Dual UTA – 1U Rack Unit

GL's High Density VQuad™ is a 1U rack unit, which includes Dual UTA PTT/Audio interface and PC interfaces. VQuad™ is capable of generating TTL triggers based on PTT activation.

GL’s VQuad™ can automatically key PTT from the CWP, then transmit and receive audio signals for Voice Quality Assessment and precise delay testing. Delay testing and verification is going to be particularly important with the transition to IP, which will introduce packetization delays as well as jitter buffer delays and other uncertainties.

Dual UTA – 1U Rack Unit

Below is a list of the key features associated with it:

  • 4-Wire Balanced Audio and PTT Contact Closure Interface for connecting to the CWP Dual Jack Module as well as other 4-wire interfaces within the network 
  • Provides 4 types of TTL output - PTT Enable, PTT Disable, Audio Trigger - Start of Audio, & Audio Detect
  • Precise One-Way Delay (OWD) measurements as well as event-based TTL or CMOS trigger outputs that can feed an oscilloscope or other discrete signal loggers
  • Voice Quality Assessment using industry-standard ITU algorithms (PESQ, PAMS, PSQM & POLQA)
  • 4-Wire “Bridge” Mode –  To monitor existing TMG’s and provide event-based trigger outputs (for latency testing)
  • Test Automation Capabilities - GUI-based or SDK and CLI versions

Dual UTA with Netbook Option

Dual UTA is a low power USB device that has been fully tested even with an ultra-portable Dual Core NetBook (no external power required). GL’s VQuad™ with Dual UTA purchased along with the NetBook PC can be conveniently packaged as a portable test unit for field testing. This allows both the VQuad™ and VQT to reside and operate simultaneously on the same NetBook. Up to two Dual UTAs can be supported in a single NetBook (thus allowing a maximum of 4 simultaneous devices). Full support is also available for remote access of the VQuad™ and an SDK directly to the Dual UTA hardware (VQuad™ not required to be running).

NetBook a portable platform for VQuad™ with Dual UTA

Dual UTA Connections

Dual UTA – Front Panel

1 -  FXO Jack: This RJ-11 jack gives the Dual UTA the ability to act as a telephone. This is a 2-Wire POTS interface that allows users to place calls, answer calls and utilize all of the Dual UTA’s voice quality and delay features.

2 -  Push-to-Talk (PTT) LED: When illuminated indicates that the PTT function is active. The active state indicates that the radio has been placed in transmit mode. Conversely, the inactive state (LED off) indicates the radio is in receive mode.

3 -  Trigger (TRG) LED: When illuminated indicates that a Round-Trip Delay (RTD) or One-Way Delay (OWD) pulse has been detected. This LED may also illuminate momentarily when connecting or disconnecting audio lines.

4 -  In Jack: This 3.5 mm jack provides a balanced Audio In port. This jack can connect to a wide variety of the network interfacing equipment. Multiple impedance options are also available with this input.

5 -  Out Jack: This 3.5 mm jack provides a balanced Audio Out port. This jack can connect to a wide variety of the network interfacing equipment. Multiple impedance options are also available with this output.

6 -  Handset (HSET) Jack: For use with handset-type phones. Connect the curly cord of the handset to this jack. – This jack works in conjunction with the Handset (HSET) Base jack on the back of the Dual UTA.

7 -  Monitor Jack: This 3.5 mm jack (stereo miniature phone type) provides for connection of a headset or amplified speakers to monitor the Audio In/Out signals on all interfaces.

8 -  Power LED: When illuminated indicates the Dual UTA is receiving power and is ready to operate. The Dual UTA is powered from the USB bus.

9 -  Side: The Dual UTA contains a Side 1 and Side 2. These sides are completely independent of each other, so Mobile Phone Network Testing could be setup on Side 1 while FXO Network Testing could be happening on Side 2.

Dual UTA – Back Panel

10 -  GPS (In): Input from external GPS receiver. The Dual UTA uses location and time to provide additional information to the user. The one pulse-per-second GPS input will allow 1 ms accurate one-way and round-trip-delay measurements. Jack = RJ-45

11 -  GPS (Out): The Dual UTA allows the GPS received data on the GPS (In) port to be transmitted out the GPS (Out) port. This enables a single GPS receiver to provide data to multiple Dual UTAs. Jack = RJ-45

12 -  Handset (HSET) Base: RJ-22 port that connects to a phone base on any telephone (POTS, VoIP, Digital) that contains a handset.

13 -  Bluetooth (BT): The Dual UTA has Bluetooth built in, which allows users to connect to Bluetooth enabled devices. This provides call control (control of phones calling/answering functions) as well as the ability to send/record audio in/out of these devices.

14 -  USB Jack: Communications and power interface connection. Connect to the computer USB port directly or through a USB hub.

15 -  Push-to-Talk (PTT): For use with radios that require activation of a push-to-talk function to transmit or receive audio signals. This RJ-45 jack is connected to the software-controlled relay internal to the Dual UTA. When PTT is active (PTT LED on), pins 4 & 7 are shorted.

Network Types

Automated Testing of Mobile Radio and Wireless Devices

4G LTE, VoLTE, 3G, 2G, WiFi, WiMax, Bluetooth™ ®

Wireless networks can impair voice quality by various means including poor mobile phone quality, voice/video compression and decompression algorithms, delay, loss or gain in speech levels, noise, acoustic and landline echo, and other distortions.

GL provides a compact and portable solution for testing Wireless and Mobile Radio devices for voice, video, and data quality using the GL VQuad™ application with the Dual UTA, or all-in-one VQuad™ Probe.

Some of the important features include:

  • Test mobile end-to-end voice, video, and data, quality measurement and analysis results
  • Mobile Phone call control – supports Bluetooth®,  2.5mm Audio Headset Jack interfaces, and 3.5mm terminations for Smartphones (iPhone, Android)
  • Support for voice quality testing on VoLTE network with AMR Wideband codec (with 16000 Sampling Rate) using Bluetooth® Wideband
  • Control Mobile Radios with Push-to-Talk functionality; Supports radio keying and send/record audio
  • Bluetooth® also performs RSSI, Battery level functions, and Network identity
  • Impair outgoing traffic using a noise file or user-defined white noise
  • All results along with call control information are sent to central database. Query results remotely using the WebViewer™.
  • Compatible with automated GPS location time-stamping

Some of these applications include

    • Voice Quality Testing (VQT) software for analysis according to widely accepted ITU (International Telecommunications Union) voice comparison algorithms (POLQA, PESQ LQ/LQO/WB)
    • Data Quality Testing (NetTest™)application for performing automated data testing on a wireless or wired network; tests include TCP, UDP, VoIP, Route, HTTP, FTP, DNS, SMS, Email, SIMInfo, Phone Info, and UEInfo
    • Video Quality Testing (VAC™) application for performing fully automated Video Conference testing and get Audio and Video MOS QoS results along with several analytical metrics
    • Echo Measurement Utility (EMU) for echo and delay measurements, including RTD, OWD, ERL, EPD, and more
    • Voice-band Analyzer (VBA) for monitoring voice band traffic (Speech Level, Activity Factor, RMS Factor, DC Level, Noise Level, Jitter, Echo Return Loss, Echo Delay, and Echo Dispersion)
    • Fax Quality Testing for emulation and analysis of T.30 faxes (GLInsight™ or FaxScan™)
    • Drive Testing solution for plotting all results and call control information along with co-ordinates using GPS receiver option in VQuad™, and Google Maps option within WebViewer™
    • WebViewer™ for web based controlling and monitoring VQuad™ nodes over the entire network 

Automated Testing of 2-Wire Analog interface (PSTN, ATA, Media Gateway)

GL's VQuad™ with Dual UTA provides the solution for testing analog 2-wire interfaces (PSTN, ATA, Media Gateway). The Dual UTA supports 2 Analog FXO interfaces (RJ11) and provides Off/On- Hook, DTMF Dialing, Flash Hook, Tone Detection (Dialtone, Ringback, Busy, Fast Busy, SIT) and CallerID. The Dual UTA Analog interface supports two-stage dialing, IVR testing, Voice Quality Testing, Delay Measurements, and Echo Measurements.

GL’s VQuad™ application can also work with vHandi™ - an handheld analog line tester to perform centralized voice quality measurements and analysis. GL’s vHandi™ is a compact portable hand-held FXO simulator (Foreign Exchange Office) that can simulate an analog phone. The vHandi™ call and voice tests can be completely automated or manually performed. Both solutions can be configured to automatically send/record a multitude of voice files and to perform VQT algorithms immediately after the voice file recording is complete.

  • Two Analog FXO ports per Dual UTA (RJ-11 interface).
  • Single FXO port per vHandi™ Handheld (RJ-11 interface)
  • Next generation Dual UTA HD includes support for FXO WB
  • Manual or Automatic operation of traffic generation and full call control
  • Each analog port may be controlled independently for traffic and call control
  • Supports all standard and customized call progress tones
  • Send/detect DTMF /MF digits, and tones of different frequencies (NB – up to 4 KHz, WB – up to 8KHz, SWB – up to 24 KHz)
  • Support for No Call Control (Quick Connect) on FXO interface 
  • Call control with Caller ID detection and display
  • Impair outgoing traffic using a noise file or user-defined white noise
  • Remote Access for starting/stopping the tests along with retrieving results.
  • All results along with call control information are sent to central database. Query results remotely using the WebViewer™.
  • Additional functionalities –

Automated Testing of VoIP (SIP) Interface, Digital VoIP Phones, VoIP Softphones

With the growing requirements for voice quality testing within VoIP networks, a major concern is testing the VoIP Network, VoIP phones, VoIP Softphones, and Analog Telephone Adaptors (ATA).

GL's VQuad™ with VoIP option, provides the ability to perform manual or automated tests on Softphones in the VoIP network.

The VQuad™ provides direct connection to the VoIP network with up to eight user agents per VQuad™ connected simultaneously. VQuad™ with Dual UTA provides the ability to test ATA’s while connected to the VoIP Network.


Automated Testing of TDM T1/E1 Interface (CAS/PRI ISDN) using T1/E1 Analyzer

Voice quality is essential for all networks as well as Gateways and Switches. The VQuad™ with TDM option includes the T1/E1 Analysis cards (PCI or PCIe) or Portable USB based T1 E1 Analyzer units for a truly portable solution.  This system provides the mechanism for signal and voice quality testing over T1/E1 trunks.

Using the T1/E1 Analyzer, the VQuad™ can generate and receive up to 12 simultaneous CAS or PRI ISDN or No Call Control (NOCC) calls on T1 or E1 trunks. Once the call is up, send/record voice via the VQuad™ to get VQT MOS results.

The T1/E1 option includes a script based CAS State Machine for creating any desired CAS protocol. Included with the PRI ISDN are all variants associated with ANSI and ETSI specifications.

  • Supports Call Control for PRI ISDN and CAS Protocols
  • Also supports No Call Control (NOCC), where the T1/E1 call is connected without any call control required.
  • Send/detect DTMF /MF digits, and tones of different frequencies (NB – up to 4 KHz, WB – up to 8KHz, SWB – up to 24 KHz)
  • Supports up to 12 simultaneous T1/E1 channels using VQuad™ interface
  • Impair outgoing traffic using a noise file or user-defined white noise
  • Additional functionalities –

Test Types

Delay Measurements

OWD - End points at same location

OWD - End points at separate location

  • Round Trip Delay (RTD) 
  • One Way Delay (OWD) 
  • Post Dial Delay (PDD)
  • Signal-to-Noise Ratio (SNR = S/N)
  • Oscilloscope and Spectral Display
  • RMS Power as well as C-Message 
  • Supports a new Correlator method for providing extremely accurate delay measurements.
  • Audio analysis feature within VQuad provides overall Frequency Bandwidth and Power associated with the voice file.

Echo Measurements

Echo Identification

Acoustic Echo Canceller Testing

  • Supports echo measurements over any network using EMU
  • Assess sidetone, line, and acoustic echo and the corresponding delays.

Voice Band Analysis

  • Monitor voice band traffic
  • Measure Active Speech Level, Activity Factor, RMS Factor, DC Level, Noise Level, Echo Return Loss, Echo Delay, and Echo Dispersion statistics.

Automated Voice Quality Testing

End points at same location

End points at different location

  • Network-independent VQT – Supports legacy, as well as Next Generation networks
  • POLQA (ITU-T P.863)
  • PESQ (ITU-T P.862), PESQ LQ, LQO (P.862.1), PESQ WB (P.862.2)
  • PAMS (ITU-T P.800)
  • PSQM/PSQM+ (ITU-T P.861)
  • Call control analysis (Failed Calls, Dropped Calls, and Call ID)
  • Monitoring IVR System for voice and data quality
  • Supports PESQ/POLQA (both NB and WB) measurements
  • Supports Narrow band and Wideband audio (both 8k and 16k samples/sec) 
  • Auto detects voice files with wideband attributes
  • All VoIP Codec supported including - G.711, G.711 App II with VAD, G.729, G.726, G.726 with VAD, GSM, AMR NB and WB, EVRC, SMV, iLBC, SPEEX NB and WB, G.722, and G722.1.
  • Visit Voice Codecs webpage for more comprehensive information.

Automated Data Quality Testing

VQuad™ is enhanced to support Data Testing including TCP, UDP, VoIP, Route, HTTP, FTP, DNS, SMS, Email, PhoneInfo, SimInfo, and UEInfo. The Data Tests are configured via the VQuad™ scripting and supports Wireless devices as well as PC Ethernet connections (wired, WiFi, Broadband 3G/4G, and LTE).

  • Network independent, supports 4G LTE, 3G, WiMax, and Wired Internet connections
  • Supports Mobile devices (i.e. iPhone, Android)
  • Supports PC Ethernet connection (Wired, Wi-Fi, Broadband (3G or 4G))
  • Different type of tests supported – TCP, UDP, HTTP, FTP, DNS, VoIP, Route, SMS, Email, PhoneInfo, SimInfo, and UEInfo.
  • End-to-End SMS Testing over wireless network directly and remotely
  • Remotely perform Data tests from GLNetTestApp on mobile devices (iPhone, Android); this requires connection with Mobile Device Controller server. Mobile device communicates with Mobile Device Controller from anywhere in the world.
  • Fully automated and remote testing with all results accessible via WebViewer™.

Automated Video Quality Testing

VQuad™ can now initiate, control, test, and measure video conferencing services over IP, and Wireless networks, using additional support of a Video Controller/Server and Video Clients (Agents).
Video Tests can be configured between any two active video clients with flexibility of specifying the typical characteristics of the Video test.   Video Test agents generates simulated video calls to other test agents as per these test parameters.

  • Fully automated Video Conference testing performed with QoS results provided along with several analytical metrics
  • Support for Android, PC and Linux based video clients (end points) for active Video Quality Testing
  • Both manual and automated tests are supported
  • Tests can be run directly from the Android phone or using the VQuad™ interface
  • Configure unlimited test plans; video test parameters include Codec, Bandwidth, Latency, Frame Rate, GoP (Group of Pictures) Structure, Echo, and Resolution
  • Test results include Video MOS, Audio MOS, and A/V MOS along with a variety of analytical and quality metrics
  • Fully automated and remote testing with all results accessible via WebViewer™.

Drive Testing for Wireless Networks

  • Drive test with any Wireless device with real-time GPS mapping
  • GPS connectivity for recording timing and location of tests performed
  • The GPS mapping records and adds the real-time GPS information to all test results and VQuad™ call control.
  • GPS Location includes stamping each result with Latitude, Longitude, and GPS Time Stamp
  • The Indoor Tracking System (ITS) in VQuad™ is developed to support VQT in remote locations where GPS signal is unavailable
  • The ITS information (location, timestamp) is saved to the database per VQuad™ Measurement
  • GPS information is automatically sent to central database and accessed via Google Maps feature in WebViewer™.

Automated Fax Quality Testing

  • Supports Fax testing (sending and receiving) up to 4 independent and simultaneous T.30 faxes over 2-Wire, and 4-wire analog networks
  • Support higher resolution and multi-page fax TIF files
  • Tx and Rx fax rate from 2400 baud to 33600 baud with V.34 fully supported.
  • Interfaces supported for fax generation include 2-wire FXO and 4-wire analog.
  • Automatically save the fax session (both East and West directions) to a PCM file.
  • Supports higher resolution and multi-page fax TIF files.
  • Use GLInsight™ or GL Fax Scan analysis software packages for further analysis of the recorded fax files. GL's FaxScan™ can be configured for fully automated analysis.

Automated IVR Testing

  • Simulate IVR Users and IVR System
  • Single-box portable solution and Rackmount PC solution for higher density
  • Complete automation with enhanced scripting and remote operation including traffic generation and call control scripting
  • Automate the IVR testing process - call establishment and traffic generation detection process through scripts
  • Monitoring IVR System for voice and data quality
  • Perform Quality of Service (PESQ) or path confirmation tests
  • Within a proper voice call, additional analysis is available such as Round Trip Delay (RTD) and Voice Quality Testing (VQT)
  • Support for Command Line Interface (CLI) to access VQuad™ remotely

Buyer's Guide

Item No. Description
VQT241 Dual Universal Telephony Adapter (UTA)
VQT242 Dual UTA Bluetooth Option
VQT245 Dual UTA - 4 Port TTL Option
  VQuad™ Network Options
VQT010 VQuad™ Software (Stand Alone)
VQT011 Dual UTA - Software Development Kit (SDK)
VQT013 VQuad™ with SIP (VoIP) Call Control
VQT015 VQuad™ with T1 E1 Call Control
VQT270 VQuad™ Probe with Dual UTA
  VQuad™ Miscellaneous
VQT204 GPS for Dual UTA
VQT030 Network Command Center (Multi-Node Command and Control Center for VQuad™ Systems)
VQT601 Mobile Device Controller (MDC) Software
VQuad™ Fax Emulation (2 simultaneous ports)
VQuad™ Fax Emulation (8 simultaneous ports)
VQT442 (cable) Mobile Audio Interface for Smartphones
VQT443 (cable) 3-wire headset interface Adaptor for Smartphones
  VQT Analysis
VQT002 Voice Quality Testing (PESQ only)
VQT006 VQT w/ POLQA Server License
VBA032 Near Real-time Voice-band Analyzer
EMU037 Echo Measurement Utility (EMU) Software
VQT040 Webviewer™


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