QoS TEST SOLUTIONS Voice / Video / Data

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Voice Quality Testing Software

(POLQA v3, POLQA v2.4, PESQ)

VQuad™ with Dual UTA HD


Latest Software

  • VQuad™ Software Ver 10.7
  • VQT Software Ver 7.9
  • WebViewer™ Software Ver 5.11

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Explore GL's full
Voice Quality Testing Solutions


GL's Voice Quality Testing (VQT) software supports the next-generation voice quality testing standard for fixed, mobile and IP-based networks using POLQA ver 2.4 and optional upgrade ver 3 (ITU-T P.863), PESQ (ITU-T P.862), PESQ LQ / LQO (P.862.1), PESQ WB (P.862.2). VQT analyzes the degraded (received) files and compares them with the reference (sent) files using ITU standard algorithms PESQ LQ/LQO/WB, and POLQA (NB, WB, SWB).

PESQ provides an objective measurement of subjective listening tests on telephony systems. POLQA, Perceptual Objective Listening Quality Analysis, is the successor of PESQ (ITU-T P.862) analysis and the next generation voice quality testing standard for fixed, mobile and IP-based networks.

POLQA® is a registered trademark of OPTICOM. GL is one of the Test & Measurement manufacturers that has adopted POLQA/P.863 in its Voice Quality Test solution, by obtaining the essential rights to use POLQA® standard, and hereby acknowledge that the images or text references to POLQA used in this document originally copyrights with Opticom.

The VQT application is available with the following options:

  • POLQA only (Optional upgrade POLQA v3)
  • PESQ only
  • POLQA (Optional upgrade POLQA v3) with PESQ

VQT works in conjunction with VQuad™ or VQuad™ Probe HD to provide "end-to-end assessment" with additional test and measuring capabilities. VQuad™ scripting allows for automated call control, and traffic simulation to conduct tests on Wireless, IP, PSTN and TDM networks. The captured data are analyzed in VQT and the results of the VQT algorithms, POLQA and PESQ LQ/LQO/WB, are displayed both in tabular format as well as graphically. Additional analytical results are displayed as part of the assessment such as POLQA MOS, E-Model, Signal Level, SNR, jitter, clipping, noise level, and delay (end to end as well as per speech utterance). All results are saved to file and database for post processing viewing along with sophisticated searching on the results within the VQT application and using the WebViewer™ (remote and local access).

VQT POLQA Measurements and Analysis

VQT POLQA Measurements and Analysis


VQuad™ - Voice & Data Testing over Quad Interface (Analog, TDM, VoIP, Wireless)

VQuad™ Probe HD - All-in-one Portable Voice & Data Testing across any Network

Webviewer™ - Centralized Web based Interface for Results, Reports, and Graphs


Main Features

  • Voice Quality Testing (VQT) using POLQA ver 2.4 (ITU-T P.863), optional upgrade POLQA ver3 (ITU-T P.863), and PESQ (ITU-T P.862)
  • Updates associated with POLQA v3 include a redesigned perceptual model for Full Band Audio analysis which is validated for VoLTE, 5G and OTT apps (supporting EVS and OPUS codecs)
  • Supports PESQ ITU-P.862.2 and POLQA for Wideband
  • POLQA ITU-T P.863 for next generation voice quality testing supporting NB (8000 sampling), WB (16000 sampling) and SWB (Super Wideband) (48000 sampling)
  • Evaluate audio quality with MOS, E-Model, SNR, jitter, clipping, signal level, noise level, and delay measurements
  • Measure packet jitter in VoIP networks
  • Analyze the effects of codec compression in wireless networks
  • VQT supports analysis of PCM16 files consisting raw data as well as u-law/a-law encoded data
  • VQT also support analysis of uncompressed wav files consisting of narrow band, wide band and super wide band signals
  • Provides POLQA and PESQ Mean Opinion Score (MOS) results
  • Sophisticated search features on the results within the VQT application
  • Playback and display of audio files from within VQT using Goldwave software
  • Complete automatic logging of all results (both file and database) with the ability to import log back into VQT.
  • All results along with call control information are sent to central database. Query results remotely using the WebViewer™
  • Support for Central DB Primary and Secondary IP addresses for backup and redundancy
  • Real-time mapping (most countries supported) of results when optional GPS is used in conjunction with VQuad™
  • Command Line Interface (CLI) support to control VQT nodes remotely. Supported on Windows® and Linux

POLQA v3 Upgrade Enhancements

  • POLQA v3 Super Wideband supports 14kHz to full audio bandwidth up to 24kHz.
  • Full band analysis improves accuracy in assessment of codecs such as EVS, OPUS, AAC and LC3, as these codecs are used in many OTT applications.
  • With full band support the discriminative power of POLQA at the upper high-quality range of the MOS scale is increased.
  • Current OTT voice services using VoLTE/5G include highly dynamic delay jitter which leads to variations of the duration of very short pauses during speech. POLQA v3 handles these variations with increased precision.
  • POLQA v3 is less sensitive to linear frequency distortions than POLQA v2.4. This makes measurements less dependent on the frequency characteristics of headsets.
  • Perceptual model of POLQA v3 is significantly improved and streamlined.

ITU Algorithms

The GL Voice Quality Testing (VQT) product utilizes several industry standard ITU algorithms in order to measure the speech quality of a transmitted voice file. VQT compares the original unprocessed signal with the degraded version using POLQA (ITU-T P.863) and PESQ (ITU-T P.862+P.862.1) international standard voice quality test methods. The GL VQT can either be installed or operated on a stand-alone system or reside as an optional feature, on other GL products. GL's VQuad™ also supports the POLQA (ITU-T P.863) standard for voice quality analysis

  • Perceptual Objective Listening Quality Analysis (POLQA)
    • Operations Performed by POLQA
    • Results Provided by POLQA
  • Perceptual Evaluation of Speech Quality (PESQ)
    • Operations Performed by PESQ
    • Results Provided by PESQ
  • ITU.56 Measurements

POLQA Vs PESQ - Comparison

Adopted in 2011, ITU-T P.863 Adopted in 2001, ITU-T P.862
Suitable for 3G and 4G networks, VoIP networks and NGN networks delivering HD- quality voice services such as "wideband" and "super-wideband" telephone calls, 7 kHz and 14 kHz frequency range. Suitable for G.711 A law and u law, and low bandwidth 300 to 3400 Hz voice bandwidth. Also supports WB (7kHz frequency range) using PESQ ITU-T P.862.2.
POLQA works quickly and accurately. POLQA is superior to existing standards, and has overcome all known issues and limitations of PESQ

PESQ-based measurements will still be considered an industry standard for several years, also for reasons of backward compatibility

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