GL Communications Inc.
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VoIP/Digital/Analog Handset Phone Testing

Overview | Main Features | Waveform/Spectral Viewer
Voice Quality Testing (VQT) Results | Buyer's Guide


Testing on the extreme end-point of a network has become a priority for many people. This method of testing represents what an end user is actually experiencing.

Voice quality testing within VoIP and PSTN networks is growing, a major concern is testing the VoIP phones and the analog Telephone Adaptors (ATA) that will be used within the VoIP/PSTN networks. The VoIP phones and ATA's must be free noise and other hindrances that may cause a degraded voice quality when using this equipment. The GL VQuad™ software combined with GL's Voice Quality Testing (VQT) software permits this desired VQT testing, of the VoIP equipment, yielding results that include PESQ/PAMS/PSQM+ Mean Opinion Scores (MOS). These results provide an excellent overall measure of voice quality of the equipment under test.

The Dual UTA contains 2 Handset testing interfaces (RJ22). This allows a user the ability to replace the handset with the Dual UTA, but continue to include the “Telephone Base Unit” in the testing network. Basically, the Dual UTA replaces the handset of any telephone that contains a handset. This includes POTS, Digital PSTN and VoIP telephones that contain a handset.

VQuad™ User's Guide
VQT User's Guide
WebViewer™ User's Guide
VQuad™ Installation
VQuad™ Supplementary Installation Guide
Dual UTA Brochure
Complete VQT Brochure
View Presentation

The Dual Universal Telephony Adapter (Dual UTA) is a comprehensive hardware device designed to interface and test the voice 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® technology.

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 quality, echo, noise, and other impairments of TDM, VoIP, and Wireless networks. A GPS sync port permits precise synchronization of sending and receiving audio functions, one-way delay (OWD), and round trip delay (RTD). The Dual UTA can be directed to automatically send and record sample voice files between nodes of a telephony network. These files can then be submitted to GL's Voice Quality Testing (VQT) software application for analysis according to widely accepted International Telecommunications Union (ITU) voice comparison algorithms. These algorithms include PESQ, PAMS and PSQM.

Main Features:

  • Connect to any phone with a handset
  • Test VoIP, Analog and Digital Phones, thus allowing VoIP ATA testing'
  • Up to two Dual UTA's connected to a single VQuad system.
  • Round Trip Delay and One Way Delay Measurements as well as Echo Measurements
  • Automatic send/receive of voice files over already established calls
  • Time/Digit/Tone triggering of send/receive voice files.
  • Compact and portable solution for testing end-to-end voice quality
  • Synchronized software for sending/recording of voice files at multiple locations
  • Flexible architecture and features for recording locations, parameters, and time
  • GL VQT Automatic Mode allows automatic execution of the VQT algorithms (PESQ LQ/LQO/WB).
  • Additional measurements include Clipping, Jitter, Latency, Noise and Signal Levels.
  • Results available in real-time or post-processing

Waveform/Spectral Viewer

The GL VQT software can be user-configured to provide a rating of each measurement based on the scores, latency, clipping, etc. A poorly rated measurement can be viewed in graphical format using the waveform viewer. Dropouts, noise and other impairments can be examined here.

Screen Shot of Waveform/Spectral Viewer

Voice Quality Testing (VQT) Results

GL's VQT may be executed automatically (real-time and/or post-processing) or manually by entering a Reference File and Degraded File. Regardless of how GL's VQT is initiated, algorithms for PAMS, PSQM, PSQM+, PESQ MOS and PESQ LQ are executed simultaneously for the two voice files and results are shown graphically as well as in a tabular format. GL's VQT also displays cumulative statistics for large scale testing over long periods of time.

Screen Shot of PESQ Measurement Window

Screen Shot of VQT Measurement Results

Screen Shot of VQT Cumulative Statistics

Buyer's Guide:

Item No. Item Description
  VQuad™ Network Options
VQT010 VQuad™ Software (Stand Alone)
VQT013 VQuad™ with SIP (VoIP) Call Control
VQT015 VQuad™ with T1 E1 Call Control
  VQuad™ Miscellaneous
VQT204 GPS for Dual UTA
VQT030 Network Command Center (Multi-Node Command and Control Center for VQuad™ Systems)
VQT011 Dual UTA - Software Development Kit (SDK)
VQT241 VQuad™ Dual UTA with Balanced, Analog FXO, PTT, and Phone Handset Interfaces
VQT242 VQuad™ Dual UTA Bluetooth option for controlling any Bluetooth device (Call Control and Audio)
VQT251 Dual UTA HD Next generation Dual UTA with FXO Wideband support
VQT252 Dual UTA HD – Bluetooth Option
VQT002 Voice Quality Testing (PESQ only)
VBA032 Near Real-time Voice-band Analyzer
EMU037 Echo Measurement Utility (EMU) Software

* Specifications are subject to change without notice.

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