Speech Quality Assessment of VoIP Devices

31 May 2018

Source: GL Communications Inc. Source: GL Communications Inc.

GL Communications Inc. a provider of telecom test and measurement solutions, announces its latest software solution for simulation of end user equipment (VoIP devices) using VQuad™ Probe HD, and Speech Quality measurement using Voice Quality Analyzer.

“Accurate and reliable assessment of speech quality within VoIP and PSTN networks is vital for the satisfaction of the end-user or customer experience," said senior manager Robert Bichefsky. "Businesses spread across geographic locations and increased telecommuting has triggered drastic demand for VoIP phones. Consequently, VoIP phone manufacturers face tremendous pressure to ensure mass production, while also ensuring devices have the latest features and at the same time they are free of noise, echo and other hindrances which may cause a degraded voice quality.”

He further explained, “GL provides VoIP manufacturers and developers with a test solution to evaluate IP phones according to international ITU-T standards for measuring end-to-end audio performance as well as the acoustic performance. End-to-end speech quality assessment can be done using an objective evaluation method which involves industry standard algorithms such as POLQA and PESQ in order to compare original and processed speech signals.”

Mr. Vijay Kulkarni, CEO of the GL Communications, added, “GL’s solution for VoIP phone speech quality testing includes VQuad™ with Dual UTA HD/VQuad™ Probe HD, VQT POLQA, and WebViewer™ (Central Database).”

Capabilities of the solution:

  • End-to-End Testing where the VQuad™ with Dual UTA HD (or VQuad™ Probe HD) sits as the endpoint in the network, whether as PSTN phone or VoIP phone, and simulates calls to DUT (IP Phones). This solution tests all possible call scenarios and network conditions.
  • Identify and mitigate potential issues in the VoIP terminals that impact voice quality or system performance.
  • Supports the use of head and torso simulator (HATS) or use of simulated ear and mouth for evaluating audio performance of the VoIP phone when operating as a hands-free device (acoustic testing using the speaker mode).

When testing, the customer may place a call between two IP Phones (DUT) with the VQuad™ Probe HD connected to the IP Phone for sending/recording audio. This scenario can also be used to test the VoIP network. Any of the possible scenarios described below can be considered for testing. The results from VQuad™ and VQT will help compare the speech quality measurement scores based on different voice codecs with support for narrowband, wideband and super-wideband. POLQA supports the latest HD-quality speech coding and network transport technology, with higher accuracy for 3G, 4G/LTE and VoIP networks.

Important Features

  • Test VoIP Phones when operating as a handset, a headset or as a hands-free device (speaker mode)
  • Connect to any phone by replacing the handset at the curly cord (VoIP, Analog and Digital Phones supported)
  • Perform VoIP ATA (Analog Telephone Adaptor) and Gateway testing
  • Compact and portable solution for testing end-to-end voice quality
  • Voice Tests per ITU-T algorithms (POLQA NB, WB, SWB and PESQ LQ/LQO/WB)
  • Load testing possible with up to six Dual UTA HD units (12 devices) connected and running tests simultaneously
  • Round Trip Delay and One-Way Delay Measurements as well as Echo Measurements
  • Automatic send/receive of voice files over established calls
  • Time/Digit/Tone triggering of send/receive voice files
  • Synchronized software for sending/recording voice files at multiple locations
  • Additional measurements include Jitter, Latency, Noise and Signal Levels
  • Results available in real-time or post-processing
  • Fully automated and remote accessible via CLI and API
  • Remote accessible via Central Database
  • Feature testing including Caller ID, 3-way call (conference call), call transfer, call forwarding, call waiting with Call ID
  • Send/Detect DTMF and user-specified single/dual-frequency tones
  • Flexible architecture and features for recording locations, parameters, and time
  • Customized consolidated results along with graphical report using WebViewer™ (web browser)
  • Display results in Google Maps using the optional GPS receiver while connected to the VQuad™ Probe HD
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