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!
