If you have an important call coming up, such as a family conversation or a business discussion, it is worth spending five minutes checking your connection. Most VoIP problems show up in simple tests before the call begins. This checklist tells you what to run and what to look for.
Step 1: Check that the dialer is registered
Open the dialer and confirm that it shows a registered or connected status. If not, fix this first using our registration checklist.
Step 2: Run a speed test that also shows ping and jitter
Use any reputable online speed test, ideally one that reports latency and jitter as well as download and upload speed. Run it on the same connection you plan to use for the call.
| Result | What to aim for | Notes |
|---|---|---|
| Upload and download speed | Steady results well above one call's needs | One call needs roughly 100 kbps each way with the highest-bandwidth codecs, so even modest connections are enough if stable |
| Ping (latency) | Lower is better; one-way delay under about 150 ms is the usual target | Ping shows round-trip time, so halve it for a rough one-way figure |
| Jitter | Under about 30 ms | High jitter causes choppy audio even with fast speeds |
| Packet loss | Close to zero, ideally under 1 percent | Not every test reports it |
For the reasons these numbers matter, see our call quality guide.
Step 3: Check the signal and the surroundings
- Stand or sit where the Wi-Fi signal is strong. Two bars out of four is often not enough.
- If you use mobile data, check the signal indicator and avoid basements or corners with poor reception.
- Pause large downloads, cloud backups and video streaming.
Step 4: Make a short test call
If you have a friend or colleague who can help, make a one-minute call and ask whether your voice sounds clear. If you are checking an international route, call someone in that country and ask for feedback about delay and clarity. A test like this tells you more than any speed result.
Step 5: Charge the phone and tidy the settings
- Plug in your phone or make sure it has enough battery. Battery saver modes can restrict background activity.
- Allow the dialer to run in the background.
- Turn off any VPN unless it is required.
- Close apps you do not need.
Step 6: Have a backup plan
Keep a second connection ready, such as mobile data if you are using Wi-Fi. If the call degrades, switching can solve the problem quickly. Our guide to Wi-Fi versus mobile data helps you decide which to try first.
Pre-call checklist
- Dialer shows registered.
- Speed, ping and jitter look reasonable.
- Strong signal and no heavy downloads.
- Phone charged and background activity allowed.
- Number written in international format. See how to dial international numbers.
- Balance or minutes available. Check the packages if you need more.
Interpreting your results: three sample outcomes
| Sample result | What it suggests | What to do |
|---|---|---|
| Ping 40 ms, jitter 8 ms, steady speeds | A healthy connection | Go ahead with the call |
| Ping 120 ms, jitter 45 ms, speeds vary | Unstable connection, likely choppy audio | Move closer to the router, pause downloads or switch to mobile data |
| Fast download but upload very low or erratic | Your voice may not reach the other person smoothly | Retest, restart the router, or use a different network |
These are examples, not strict limits. A result that is slightly worse than the ideal can still sound fine, and a result that looks excellent can still hide occasional bursts of packet loss. The real call is the final test.
Test at the right time
Network conditions change during the day. If you often call in the evening, run your test in the evening. A test at 3 pm does not tell you much about how the network will behave at 8 pm. If you can, test at the same time of day and on the same network that you plan to use, and repeat the test twice, because one reading can be a fluke.
If the test fails
- Restart the phone and the router, then test again.
- Move to a spot with a stronger signal.
- Pause downloads and streaming on all devices.
- Try the other connection type, Wi-Fi or mobile data.
- If the problem persists, contact your internet provider about line quality, and tell the person you are calling that the call may need to be rescheduled.
Having a plan in place removes much of the stress from an important call. Even a quick test can prevent the awkward moment when the call breaks up and neither side can hear properly.
Next step: Planning regular international calls? Compare packages so you do not run out of minutes mid-call.
Frequently asked questions
What internet speed do I need for VoIP?
Voice needs very little bandwidth per call. Stability and low jitter matter more than raw speed.
Should I test with a VPN on?
Test the way you intend to call. If you plan to use a VPN, test with it on and compare against it off.
What if the test looks fine but calls still sound bad?
The problem may be at another point along the route or in the app settings. Contact support with details of the call.
