How to set up and troubleshoot VoIP phone system audio quality issues

Summary

This guide helps you troubleshoot and resolve: How to set up and troubleshoot VoIP phone system audio quality issues. Follow the steps below to fix the issue.

Common Causes

Maintaining crystal-clear voice quality is essential for professional business communications. VoIP (Voice over Internet Protocol) relies entirely on your network stability; therefore, any congestion or hardware failure can result in distorted audio, delays, or disconnected calls. This guide will help you identify and resolve the most common audio issues affecting your phone system.

Quick Fix Steps

Before diving into deep technical configurations, try these immediate steps to resolve common glitches:

• Restart your hardware: Power cycle your VoIP handset or softphone application and your internet router.
• Check physical connections: Ensure the Ethernet cable is firmly seated in the LAN or Internet port of the phone.
• Test your headset: If using a softphone, plug your headset into a different USB port or test it on another device to rule out hardware failure.
• Check your bandwidth: Ensure no one on your network is performing large file uploads or downloads (such as cloud backups) during your call.

Detailed Instructions for Optimising Audio

Configuring Quality of Service (QoS)

QoS tells your router to prioritise voice traffic over other types of data, preventing "jitter" (choppy audio) when the network is busy.

1. Log into your router's administration panel via your web browser.
2. Navigate to the Advanced or Network tab.
3. Locate the QoS or Traffic Prioritisation menu.
4. Enable QoS and select Voice/VoIP as the highest priority traffic.
5. Save the settings and restart the router.

Optimising Softphone Settings

If you are using a software-based phone on Windows or macOS, ensure the operating system is not throttling the application.

1. Open Settings (Windows) or System Settings (macOS).
2. Go to Privacy & Security > Microphone.
3. Ensure the toggle for your VoIP application is set to On.
4. Within the VoIP app, go to Settings > Audio and manually select your preferred headset rather than leaving it on Default.

Troubleshooting Common Audio Symptoms

Echo and Feedback

Echo usually occurs when the caller's voice is picked up by the receiver's microphone and sent back to them.

• Lower the volume: High speaker volume can bleed into the microphone. Reduce the volume on the handset or headset.
• Use a headset: Speakerphones are more prone to echo than dedicated headsets.
• Check for "Acoustic Echo Cancellation": In your phone's Audio Settings, ensure Echo Cancellation is enabled.

Choppy Audio or Jitter

This is typically caused by packets of data arriving out of order or being dropped entirely.

• Switch to Wired: If using a Wi-Fi connection, switch to a physical Ethernet cable. Wi-Fi is susceptible to interference that causes jitter.
• Disable VPNs: Some VPNs route traffic through distant servers, increasing latency. Try disabling your VPN to see if audio quality improves.
• Update Firmware: Check the System menu on your physical phone to ensure you are running the latest firmware version.

One-Way Audio (You can hear them, but they can't hear you)

This is almost always a firewall or NAT (Network Address Translation) issue where the audio packets are being blocked.

1. Access your router settings and locate the Security or Firewall section.
2. Look for a setting called SIP ALG (Application Layer Gateway).
3. Set SIP ALG to Disabled. While intended to help VoIP, it often corrupts the packets in modern systems.
4. Apply changes and restart the phone.

If you have followed these steps and your audio quality remains poor, please Open a Ticket so our engineers can analyse your line quality and packet loss.

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