Understanding Telephone Echo


A picture of the word Echo

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Filed under - Industry Insights,

Josh O’Farrell of Spearline introduce us to “telephone echo” and how it can cause headaches for contact centre managers.

Today’s users have very high expectations regarding the quality of phone calls, and there are many issues that can occur with a voice connection, including echo.

Businesses depend on clear communication channels in their customer interactions and more and more are taking a truly proactive approach to audio quality management.

One of the most common, and most irritating, problems which you can face in a call is echo. Echo is the phenomenon wherein speakers hear their own voice echoed back after a brief delay.

Although some technologies mitigate many causes, echo is still a constant problem even with the advent of VoIP.

A notorious cause of customer complaints and churn, constant echo coming from both your agents and customers ends makes it a struggle to understand what is being said, which results in a dropped call.

Similarly, when a conference call suffers from audio issues, including echo, background noise, poor volume, or static, the brain has to work harder to focus on the most important source of the sound.

Organizations actively want to avoid these situations as they lower employee productivity and increase frustrations.

Sidetone is a unique kind of echo where sound effectively loops back between the speaker and microphone at one end of a phone call, as a form of electrical feedback through the telephone hybrid.

While every telephone call has some echo, the concern is whether the echo is noticeable to the callers.

Echo can be caused by two or more call participants being located in the same room, but on individual equipment, with the audio cross-contaminating microphone inputs.

It can also be caused by network issues, cabling, equipment configurations, or even a single user’s own speaker feeding back into his/her microphone.

Echo, overlapping noises, i.e. talking over each other, slow calls, interrupted calls, and disturbed voice and video synchronization are all common effects of poor latency during conferencing.

Research indicates that when there is a delay of 35ms or less in one-way transmission (round-trip delay of <70ms), the speaker cannot distinguish the echo from an acceptable level of sidetone.

However, as one-way delay increases beyond 35ms, the echo grows more problematic. The longer the delay, the more dramatic and invasive the echo becomes.

Echo Reduction

To maintain speech quality, echo reduction and echo cancellation techniques are used in telecommunications networks and network infrastructure. These work to avoid echo or to delete the echo once sensed.

Most network infrastructure in the route of any two callers will have configurations that will help control and mitigate echo, but most phone calls require several networks, and teams making distinct configuration decisions can manage each network.

Echo remains a process which is ever-present.

A thumbnail photo of Josh O’Farrell

Josh O’Farrell

Thankfully, proactive monitoring and testing tools are able to identify these issues before your customer does, preventing your company from facing negative outcomes like customer churn and potential loss in revenue.

These tools run tests that will determine precisely what the problem is, helping you to fix the issue promptly before it becomes too large an obstacle for you and your customers.

To find out about Spearline’s monitoring and testing tools, visit: www.spearline.com

About Spearline

Spearline Spearline provides quality assurance tools for business communication services, allowing you to proactively manage your inbound and outbound voice, SMS, and Fax services.

Read other posts by Spearline

Call Centre Helper is not responsible for the content of these guest blog posts. The opinions expressed in this article are those of the author, and do not necessarily reflect those of Call Centre Helper.

Published On: 15th Feb 2021 - Last modified: 16th Feb 2021
Read more about - Industry Insights,


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