Call Quality: What It Means and How Businesses Measure It

"Call quality" is one of those phrases used constantly in business calling, often without anyone stopping to define it. Ask a network engineer what it means and they'll talk about audio clarity, delays, and dropped connections. Ask a call center manager and they'll talk about whether the caller followed the process, solved the problem, and treated the customer well.

Both are right. Call quality has two sides: the technical quality of the call itself, and the quality of the conversation that happens on it. A call can fail on either one, and businesses that care about their calls usually measure both.

Part One: Technical Call Quality

Technical call quality is about whether both people can hear each other clearly and talk without interruption. It's easy to take for granted until something goes wrong, and when it does, even the best conversation falls apart.

Most business calls today travel over the internet using VoIP (voice over internet protocol) rather than traditional phone lines. Voice is broken into small packets of data, sent across the network, and reassembled at the other end. Most technical quality problems come from something going wrong along that journey.

The common technical problems

Latency is the delay between someone speaking and the other person hearing them. Small delays go unnoticed, but larger ones cause people to talk over each other or wait awkwardly for a reply. The international telecoms standards body, the ITU, recommends keeping one-way delay below about 150 milliseconds for natural conversation.

Jitter is variation in how long packets take to arrive. When packets arrive unevenly, speech can sound choppy or distorted.

Packet loss happens when some packets never arrive at all. The result is missing syllables, robotic-sounding audio, or brief silences.

Echo is when a speaker hears their own voice repeated back, often caused by equipment or network issues.

Dropped calls are calls that disconnect unexpectedly, which frustrate both sides and often mean starting the conversation over.

Poor audio at either end can come from low-quality headsets, background noise, weak mobile signal, or bad microphone placement.

How technical quality is measured

The most widely used measure is the Mean Opinion Score (MOS), which rates call audio on a scale from 1 (bad) to 5 (excellent). It was originally based on people listening to calls and rating them, but today it's usually estimated automatically from network measurements. Alongside MOS, businesses and phone providers track latency, jitter, packet loss, and the rate of dropped or failed calls.

Improving technical quality

Most technical problems can be reduced with a reliable internet connection with enough capacity for voice traffic, network settings that prioritize voice over other data, a dependable phone or telephony provider, good headsets with noise-cancelling microphones, and a quiet working environment. When problems persist, call quality reports from the phone system usually help pinpoint whether the cause is the network, the provider, or the equipment.

Part Two: Conversation Quality

Conversation quality is about what happens on the call: whether the caller handled it well, followed the right process, gave accurate information, and left the other person with a good experience.

Unlike audio quality, conversation quality can't be measured by a single number from a network report. It needs a clear definition of what a good call looks like, and a consistent way of checking calls against that definition.

What businesses look for

While every business defines quality slightly differently, most quality reviews look at a similar set of areas:

• Opening. Did the call start clearly, with the right greeting and any required disclosures?
• Process and accuracy. Were the right steps followed, and was the information given correct?
• Listening and understanding. Did the caller understand the other person's needs before responding?
• Communication. Was the language clear, polite, and free of jargon?
• Resolution or outcome. Was the issue solved, or did the call reach the right next step?
• Compliance. Were legal and policy requirements met, such as consent, disclosures, and handling of personal data?
• Close. Did the call end with a clear summary and next steps?

Quality assurance scorecards

The most common tool for measuring conversation quality is a quality assurance (QA) scorecard. It's a checklist of the areas above, with each item scored, sometimes as a simple yes or no and sometimes on a scale. Items are often weighted by importance, and some are treated as critical. For example, missing a required legal disclosure might fail the whole call, no matter how well everything else went.

A good scorecard is specific. "Was the agent friendly?" is open to interpretation. "Did the agent confirm the customer's issue before offering a solution?" is something any reviewer can check the same way.

How calls are reviewed

Businesses use several methods to review conversation quality, often in combination.

Call recording and sampling. Calls are recorded, and a sample is reviewed against the scorecard. Because reviewing every call by hand isn't practical in a large operation, sampling gives a representative picture.

Live monitoring. Supervisors listen to calls as they happen. This allows them to spot problems in real time and, where needed, step in to help.

Calibration sessions. Reviewers score the same calls independently and then compare results. This keeps scoring consistent, so a call isn't judged differently depending on who happens to review it.

Speech and text analytics. Software can transcribe calls and scan them automatically for keywords, required phrases, silences, interruptions, and signs of customer frustration. This makes it possible to check far more calls than manual review alone, and to flag the ones that need a person's attention.

Customer feedback. Short surveys after a call ask customers directly how it went. Common measures include customer satisfaction (CSAT), which asks how satisfied the customer was, and Net Promoter Score (NPS), which asks how likely they are to recommend the business. Feedback adds the customer's own view, which internal reviews can miss.

Turning Measurement Into Improvement

Measuring quality is only useful if it leads to better calls. The best quality programs use reviews to find patterns, not just to grade individuals. If many callers are struggling with the same question, the script or training may need updating. If one person consistently misses a step, coaching is the answer. If calls are failing because of poor audio, the fix is technical, not personal.

Feedback is most effective when it's specific, timely, and balanced. Pointing to a particular moment in a recorded call, explaining what could be done differently, and recognizing what went well tends to change behavior far more than a score on its own.

Why Both Sides Matter

Technical and conversation quality depend on each other. A well-trained caller can't help a customer they can't hear, and a perfect connection doesn't fix a confusing or inaccurate conversation. Businesses that take call quality seriously look at both: whether the line is clear, and whether what's said on it is right.

Good call quality, in the end, is simple to describe. Both people could hear each other, understood each other, and the call did what it was meant to do. Measuring it well is how a business makes sure that's true on every call, not just the ones that happen to go well.

Related articles

• Common Call Center Metrics, and What Each One Tells You