Common VoIP Problems and How to Fix Them

VoIP call quality is usually excellent - often better than old phone lines. But when something's off, it's almost always down to the network rather than the phone system itself. Here are the most common VoIP problems, what causes them, and how to fix them.

1. Choppy or robotic audio

Cause: Usually jitter or packet loss - your network is delivering voice data unevenly or losing some of it.

Fixes:

• Use a wired connection instead of Wi-Fi for desk phones.
• Enable Quality of Service (QoS) on your router to prioritise voice traffic.
• Check nothing is hogging bandwidth (big uploads, backups) during calls.

2. Dropped calls

Cause: An unstable internet connection or an overloaded router.

Fixes:

• Test your connection's stability, not just its speed - see internet speed for VoIP.
• Restart or replace an ageing router.
• Ensure you have enough upload headroom for your concurrent calls.

3. Echo

Cause: Often a hardware issue - a faulty headset, a poor-quality handset, or feedback from a speakerphone.

Fixes:

• Try a different headset or handset to isolate the culprit.
• Lower speaker volume on speakerphone calls.
• Use quality, supported devices.

4. Delay (latency)

Cause: High latency - voice data is taking too long to travel, causing that awkward "talking over each other" lag.

Fixes:

• Choose a provider with a well-connected, voice-optimised network.
• Avoid routing voice through a VPN unless it's set up for it.
• Reduce the number of network "hops" between you and the provider.

5. One-way audio

Cause: Typically a firewall or router configuration blocking voice traffic in one direction.

Fixes:

• Check firewall settings for VoIP/SIP.
• Ensure the router is configured for your phone system (a good provider helps with this).

When to call your provider

If you've checked the basics - wired connection, QoS, healthy internet - and problems persist, it's time to involve your provider. This is exactly where responsive, knowledgeable support earns its keep: they can analyse call quality data and pinpoint the cause quickly.

The bottom line

Almost every VoIP problem traces back to the network, not the phones - and most are fixable with a wired connection, QoS, and a stable, well-provisioned internet line. Get the foundations right and VoIP is rock solid. Struggling with call quality? Request a callback and we'll diagnose it, or explore our Cloud Telephony service.