How to Evaluate Voice Quality in VOIP Network

VoIP or Voice over Internet Protocol is one of the most popular and effective communication services. VoIP transform voice signals into data packets and transmit them over the internet from one point to another. The use of IP phone has gained immense popularity among small, medium and large businesses. This is largely because it reduces the expense of call transmission.

VOIP-Network

Quality of calls in VoIP has always been a contentious issue. New VoIP or IP phone users are often doubt the quality of calls. Usually people fail to realize that faulty network and low bandwidth results in call quality issues. VoIP implementation has some basic prerequisites. Users will be able to get rid of quality issues forever once these perquisites are fulfilled.

Quality evaluation is needed to grade the call quality of IP phone calls. It helps in evaluating the technical and commercial viability of a communication technology. Similar techniques are used for both improving quality of VoIP call and quality evaluation. This generally involves subjective as well objective voice quality measurement.

he need to evaluate voice quality in VoIP (Voice over IP) applications is an important

requirement for technical and commercial reasons. This may involve subjective and/or

objective voice quality measurements, but existing methods may not always be appropriate

for VoIP applications.

he need to evaluate voice quality in VoIP (Voice over IP) applications is an important

requirement for technical and commercial reasons. This may involve subjective and/or

objective voice quality measurements, but existing methods may not always be appropriate

for VoIP applications.

The need to evaluate voice quality in VoIP (Voice over IP) applications is an important

requirement for technical and commercial reasons. This may involve subjective and/or

objective voice quality measurements, but existing methods may not always be appropriate

The neefor VoIP applications.

Internet-Based MOS Test

MOS test methodology is an extremely popular test to assess the quality of the VoIP network. The test involves quality assessment of the codecs and it can be difficult due to subtle differences in the codecs. Besides this packet loss instances and various limitations of IP phone VoIP applications also need to be taken into account. It has been proven that packet loss is far more fatal than the faulty codecs.

Evaluation of the Voice Quality

This evaluation method uses a PC-based software system. The software simulates key processes of the VoIP technology used by an IP phone. At the same time quality of the speech is also evaluated. It measures the objective voice quality by using ITU PESQ and E-Model evaluation. Comparison between internet-based MOS assessments and more conventional MOS evaluation can also be drawn.

Measurement of Intrusive Conversational Speech Quality

Intrusive Conversational Speech Quality is a great method of predicting one-way speech quality. However, it does not take into account the impact of the end-to-end delay; a vital component of interactivity in communication. This particular test is a conversational method of quality measurement. It truly and properly exploits the accuracy of the Perceptual Evaluation of Speech Quality (PESQ) algorithm.

Non-Intrusive Objective Measurement

There has been an extension of the elementary E-model in multiple directions. This has been coupled with the non-intrusive monitoring of quality for VoIP applications. However, the equation of equipment impairment in case of this assessment is based on the subjective tests. These are conducted to obtain the model parameters for each codec, application as well as the condition prevailing within the network. Naturally, this is pretty time consuming as well as impractical method. It may even prevent the development of a cognitive E-model for designing the future IP phone applications.

Author – Michelle Patterson