If you rely on VoIP for communication, you’re probably familiar with the challenges that come with it!

It is known for issues like distorted audio, delays, or sudden call dropouts. These VoIP call quality issues can significantly impact your conversations, customer relationships, and even business productivity.

These issues are difficult to tackle. 😞

However, there’s good news. With the right practices, you can easily monitor and troubleshoot common VoIP call quality issues effectively. 

In this article, we’ll explore the main causes of poor VoIP call quality and offer actionable tips for troubleshooting VoIP call quality issues. By following these steps, you can improve your VoIP quality and enhance overall customer experiences.

KEY HIGHLIGHTS

• VoIP call quality refers to the clarity and smoothness of audio during a Voice over Internet Protocol (VoIP) call.
• Voice over Internet Protocol (VoIP) is a voice communication technology that converts analog voice signals into digital data packets and transmits them over the Internet.
• In VoIP communication, network stability, bandwidth, and processing of voice data affect call quality, with issues like jitter, latency, and packet loss.
• The best practices to improve VoIP call quality are to make the connection stable, invest in better headsets, upgrade to VoIP-optimized routers, and conduct regular call quality testing. 

What is VoIP?

Voice over Internet Protocol (VoIP) is a voice communication technology over the Internet that converts analog voice signals into digital data packets and transmits them over broadband networks. 

This technology allows users to make calls from anywhere with an internet connection. Since calls travel over the internet, businesses and individuals can reduce expenses associated with landlines. 

In addition, VoIP offers more unique and advanced features than traditional phone lines. These features include call forwarding, power dialer, lead capture, IVR, call whispering, live call monitoring, call listening, and more.

What is Call Quality?

Call quality refers to how clear and reliable a voice call sounds to both the caller and receiver. A high-quality call enhances conversation, while a poor call causes misunderstandings and frustration.

In VoIP communication, several factors affect call quality, including network stability, bandwidth, and processing of voice data. In these factors, issues like jitter, latency, and packet loss affect the call quality, which results in choppy or distorted audio.

Therefore, it is important to regularly monitor these factors to make it easy to find these issues.  To monitor, you can use various VoIP call quality tests to understand audio performance. These tests measure key metrics like Mean Opinion Score (MOS), latency, and packet loss.

On top of monitoring, you can also troubleshoot problems. Troubleshooting VoIP call quality issues can improve clarity and reliability. 

You can also optimize network settings and use quality hardware to enhance call performance significantly.

What Impacts VoIP Call Quality?

Call quality with VoIP depends on a stable and high-speed Internet connection. Without a reliable network, users may experience issues like delays, echoes, choppy audio, or dropped calls.

So, it is important to understand these elements to troubleshoot VoIP call quality issues and improve overall VoIP performance.

Let’s explore the key factors that influence VoIP call quality.

1. Internet Connection Speed and Stability

To use VoIP call quality, you need a fast and stable internet connection with minimal bandwidth. Sometimes, it is compromised due to fluctuations in speed or network congestion. This fluctuation can disrupt communication.

Other times, call quality decreases because of poor connection. Normally, for high-quality VoIP calls, a broadband connection with at least 3-5 Mbps per user is required. If this connection is not established, it will result in dropped calls, distorted voices, and inconsistent audio.

2. Latency (Delay)

Another factor that impacts call quality is latency. In simple terms, latency is the time it takes for voice data to travel from sender to receiver. If you experience high latency, it will create noticeable delays and make conversations feel unnatural.

Ideally, latency should stay below 150 milliseconds for smooth VoIP performance. However, factors like geographic distance, overloaded servers, or poor network routing contribute to latency issues.

3. Jitter

In VoIP, you also need to consider call jitters. A jitter happens when data packets arrive at different time intervals instead of consistently. This variation leads to robotic-sounding audio.

The solution is to use a jitter buffer. A jitter buffer helps to smooth out variations. However, excessive jitter can still degrade call quality. 

4. Packet Loss

During your call, you may hear incomplete words or choppy speech. It is caused due to packet loss. It occurs when voice data fails to reach its destination. Even a small packet loss rate can significantly impact VoIP call quality.

Additionally, network congestion, poor router performance, or weak Wi-Fi signals often cause packet loss.

5. Network Congestion

When too many devices compete for bandwidth, network congestion occurs and affects your VoIP quality. In simple words, video streaming, large downloads, or multiple users on the same network can slow down VoIP traffic.

To prevent congestion, limit bandwidth-heavy activities during VoIP calls. Or, use a dedicated network or VLAN for VoIP to ensure better call quality.

6. VoIP Codecs

VoIP codecs also affect your call quality. Usually, VoIP codecs help to compress and decompress audio signals for transmission. But there’s a catch. It can sometimes affect your bandwidth. 

In general, codecs prioritize low bandwidth usage. However, sometimes, it uses high bandwidth to focus on superior sound quality.

Wideband codecs like G.722 or Opus offer higher VoIP call quality but require more bandwidth. So, make sure to choose the right codec depending on available network resources and call performance needs.

7. Quality of Service (QoS) Settings

QoS settings help prioritize VoIP traffic over other data on a network. Without proper configuration, VoIP packets might compete with background downloads that reduce call quality.

By enabling QoS, you can ensure VoIP calls receive priority, reducing jitter, packet loss, and latency. Many business routers include QoS features to optimize VoIP performance.

8. Distance from VoIP Server

The further a VoIP call travels, the higher the chances of latency and jitter. In simple words, calls routed through distant servers experience more delays due to extended transmission times.

Therefore, choosing a VoIP provider with servers closer to your location improves call quality. Also, many cloud-based VoIP providers have distributed servers to minimize distance-related issues.

How To Identify & Monitor VoIP Call Issues

You can start by identifying your VoIP call quality issues by monitoring critical metrics like jitter, packet loss, latency, and Mean Opinion Score (MOS). By monitoring these indicators, you get valuable insights into network performance.

But to do so, you can use a VoIP provider. It will track your call quality regularly. On top of that, many VoIP service providers offer built-in analytics that track call health in real-time. You can also identify VoIP call issues by running regular speed tests. It will help you determine if the internet connection meets your VoIP requirements. 

Additionally, another key approach is gathering user feedback. Customers and employees can provide firsthand reports of call issues like echoes, distorted sound, or one-way audio. These complaints often highlight problems that may not be immediately visible in technical metrics. 

Then, you can use this information to monitor call quality. You can do so by cross-referencing subjective feedback with objective data to pinpoint and resolve VoIP call quality issues.

Additionally, you can use a proactive monitoring method. It is the best way to prevent call disruptions. Do it by running test calls from different locations. This will help to detect potential issues before they impact real conversations. 

Troubleshooting VoIP Call Quality Issues

Poor VoIP call quality can disrupt communication and cause frustration for both businesses and customers. While a weak internet connection is a common culprit, several other factors can impact VoIP performance. 

To fix these issues, it is essential to identify the root cause and apply the right solution.

Below are the most critical VoIP call quality issues, listed in order of priority, along with troubleshooting steps.

1. Network Connectivity Problems

The main VoIP call issue is a network connectivity problem. As we all know, a stable Internet connection is essential for high-quality VoIP calls. If it is not available, you may experience dropped calls, choppy audio, or delays.

Solution:

• Run a VoIP call quality test to check for packet loss, latency, and jitter.

• Use a wired Ethernet connection instead of Wi-Fi for more reliable connectivity.

• Restart routers and modems periodically to refresh the network.

• Contact your ISP to upgrade bandwidth if needed.

2. High Jitter Leading to Choppy Audio

Another main issue in VoIP calls is that robotic or distorted sounds happen more than often. This is mainly caused by high jitter rates. It can occur when your voice packets arrive at irregular intervals.

Solution:

• Set up Quality of Service (QoS) settings on your router to prioritize VoIP traffic.

• Increase the jitter buffer in your VoIP system to smooth out variations in packet delivery.

• Minimize network congestion by limiting bandwidth-heavy applications during calls.

3. Latency Causing Delayed Audio

VoIP users also suffer from audio delays. These delays are caused by latency above 150 milliseconds. High latency usually creates noticeable delays, making conversations unnatural. 

Solution:

• Perform a VoIP call quality monitoring test to measure latency.

• Use a low-latency VoIP provider that optimizes routing for voice traffic.

• Upgrade to fiber-optic or high-speed broadband to reduce delay.

4. Packet Loss Resulting in Missing Words

In VoIP calls, you can sometimes experience packet loss. It occurs when voice data fails to reach its destination. These packet losses can lead to gaps in the conversation.

Solution:

• Check for network congestion and allocate sufficient bandwidth for VoIP.

• Use error correction protocols like Forward Error Correction (FEC) to recover lost packets.

• Switch to a higher-quality codec, such as G.71,1, for better sound clarity.

5. Echo and Audio Feedback

Sometimes, you hear an echo in a telephone call. It occurs when the microphone picks up the speaker’s voice and plays it back with a delay.

Solution:

• Use a headset instead of external speakers and microphones.

• Enable echo cancellation features in your VoIP settings.

• Lower the microphone volume to prevent sound from looping back.

6. Dropped Calls

Your call can be randomly discounted. These sudden call disconnections are caused by unstable networks, insufficient bandwidth, or VoIP system misconfigurations.

Solution:

• Ensure firewalls and security settings are not blocking VoIP traffic.

• Check if ISP throttling is affecting VoIP performance, and consider using a VPN.

• Restart network equipment and update firmware regularly.

7. Poor Audio Quality Due to Codec Issues

VoIP codecs compress and transmit voice data. Using the wrong codec can result in low-quality sound.

Solution:

• Use G.711 for the best call quality or G.729 if bandwidth is limited.

• Ensure both ends of the call are using the same codec for compatibility.

• Avoid transcoding between multiple codecs, as it can degrade audio quality.

8. VoIP Hardware and Firmware Problems

Sometimes, using outdated or faulty VoIP hardware can cause inconsistent call quality.

Solution:

• Regularly update firmware on routers, VoIP phones, and network devices.

• Replace old or malfunctioning headsets, handsets, and microphones.

• Invest in business-grade VoIP hardware for better reliability.

Best Practices To Improve VoIP Call Quality

Clear and effective communication is crucial for every support and sales team. Understanding and applying the best practices empowers employees to be productive.

Below are some of the best practices to improve your business VoIP call quality. 

1. Make Your Internet Connection Stable

First, be sure that your internet bandwidth is enough to support a high-quality voice without any quality issues or congestion. If possible, upgrade to a business-class internet plan that ensures sufficient bandwidth for uploading and downloading even in peak usage times. 

A minimum of 25-50 Mbps upload speed is required to avoid any network issues. In addition, you can install a better-quality router and utilize its QoS system to prioritize the voice packets on your network. 

Remember to check if your device also supports the internet; it’s recommended to allocate one between 2.4Ghz and 5Ghz wifi bands. 

2. Get New Software for Compression

VoIP networks rely on digital signal compression to transmit data efficiently. In case of incompatible or too aggressive compression software, it might degrade voice quality. 

Having said that, it’s important to get suitable compression software. Since the excessive compression might also distort the audio, investing in a more compatible compression software might be a good start for clear and crisp audio. 

3. Invest in Better Headsets

Hardware matters equally! Even if you have better software or a stable network, your voice might seem robotic and unclear without proper headphones consisting of high-quality microphones. 

Good-quality headsets can prevent sound distortion, one-way audio, and other common issues. Reliable hardware makes sure that calls throughout the call centers sound professional and clear, which improves communication effectiveness. 

4. Upgrade to a VoIP-Optimized Router

We all know that standard routers are not designed to prioritize VoIP traffic. These routers usually cause call drops and latency issues. Therefore, it is best to upgrade to a VoIP-optimized router. This router prioritizes voice packets and reduces delays and jitter.

So, it is best to look for routers that support features like Session Initiation Protocol (SIP) and Virtual LAN (VLAN) capabilities. These settings allow better management of data flow and ensure a stable calling experience.

5. Minimize Network Interference

It is known to all that network congestion and interference significantly impact VoIP call quality. It means devices such as microwaves, Bluetooth devices, and other wireless electronics cause signal disruptions.

To reduce these interferences, you must use wired connections whenever possible. However, if  WiFi is necessary, you must ensure that the router is placed strategically. It will help to minimize signal disruptions. Additionally, limit bandwidth-heavy activities like video streaming and large file downloads during important calls.

6. Enable VoIP Call Quality Monitoring

It is also very effective to use VoIP call quality monitoring tools. By implementing these tools, you can get insights into latency, jitter, and packet loss. With regular monitoring, you can identify VoIP call quality issues. 

Then, you can use this information to troubleshoot VoIP call quality issues in real time. Plus, you can also take proactive steps to improve overall VoIP performance.

7. Conduct VoIP Call Quality Tests Regularly

You can also ensure consistent performance by regularly conducting VoIP call quality tests. Performing VoIP call quality tests helps detect issues early and optimize network settings accordingly.

For that, use built-in VoIP tools or third-party solutions to measure Mean Opinion Score (MOS), latency, and jitter. This practice helps businesses fine-tune their systems and maintain a high standard of call quality.

Conclusion

VoIP call quality plays a crucial role in business communication. It has a direct relation with a business’s image and its success. A good VoIP call quality will help to improve conversations, customer relationships, and even business productivity.

So, by understanding the factors that affect VoIP performance, a business can apply appropriate solutions and achieve call clarity and stability. 

Therefore, you must understand all call quality factors, from optimizing network settings to using VoIP call quality monitoring tools. It will help you achieve a better user experience. 

By following these steps, you should be able to improve communication, enhance customer relations, and ensure maximum efficiency.

FAQs

What is VoIP call quality?

VoIP call quality is the clarity and consistency of a voice transmission through an internet connection. Factors like jitter, packet loss, latency, and overall signal strength of the internet determine it. 

Are VoIP calls good quality?

Yes, VoIP calls are considered to be very good quality. However, it depends on various factors, such as internet connection, proper setup, and the VoIP provider you choose. 

Why does good VoIP call quality matter?

Disruptions in voice quality not only harms the communication but the whole business’s productivity. That’s the reason a good & reliable VoIP call quality is a must for businesses aiming for growth and higher efficiency. 

How to measure VoIP call quality?

You can measure the VoIP call quality using network assessment tools and VoIP-specific software. These tools help you identify issues that affect the latency, jitter, and loss of packets. 

What is the signal quality of VoIP calls?

The signal quality of VoIP calls is the consistency and clarity of the transmission of voice. High signal quality refers to reduced jitter and minimal latency, which makes it uninterrupted communication. 

How to test VoIP call quality?

There are multiple software such as Onsip VoIP test, Voiptoners, and Speedtest.net for analyzing VoIP call performance metrics. In addition, they provide call record histories that allow you to conduct sample calls and monitor clarity and quality. 

What are the most common types of VoIP call quality issues?

Common VoIP call quality issues include poor call quality or choppy audio, dropped calls, echoes, latency, jitter, and calls connecting with no sound. These problems often stem from insufficient bandwidth, network congestion, packet loss, improper QoS settings, or issues with the hardware or software being used.