How can I improve call quality on BT Business Broadband?

Joyce922Gaut — Fri, 06 Feb 2026 05:05:35 GMT

I’ve been experiencing intermittent call quality issues when using VoIP services over BT Business Broadband. Sometimes the audio drops or becomes distorted, especially during peak hours. I’ve already checked my router settings and ensured that my devices are updated, but the problem persists.
I’d like to know:
- Are there recommended router configurations or QoS (Quality of Service) settings that can help?
- Could this be related to bandwidth allocation or line stability?
- Has anyone else faced similar issues, and what solutions worked for you?
Any advice from the community or BT experts would be greatly appreciated.

Re: How can I improve call quality on BT Business Broadband?

AlanM1 — Fri, 06 Feb 2026 09:54:45 GMT

Hi there, thanks for sharing this — intermittent VoIP call quality issues can be really frustrating, and we appreciate the detail you’ve already provided.

🔧 Router configuration & QoS
For BT Business Broadband, enabling QoS (Quality of Service) or prioritising voice traffic can make a noticeable difference. If you’re using a BT‑supplied router, this is usually managed automatically, but some third‑party routers allow you to manually prioritise SIP/VoIP traffic. It’s also worth checking that SIP ALG is disabled, as this feature can sometimes interfere with VoIP calls.

📶 Bandwidth or line stability
Yes, both can affect call quality — especially during peak‑time congestion. Even small drops in line stability can cause audio clipping or distortion. Running speed and stability tests at different times of day can help identify patterns.

👥 Others experiencing similar issues
This does come up occasionally with VoIP services. Common solutions include:

Using a wired connection instead of Wi‑Fi
Rebooting the router
Checking for any local broadband issues
Ensuring no uploads/large backups are saturating the line

If the issue continues, the best next step is to run a broadband line test or report a fault so the team can check for stability or congestion issues. You can do that here:
👉 Help and support | BT Business

Hope this helps!

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How can I improve call quality on BT Business Broadband?

Re: How can I improve call quality on BT Business Broadband?