VoIP call quality: how to fix a robotic voice, echo or choppy audio on your dialer

If you make calls all day, bad audio isn't something you can work with. The prospect can't hear you, asks you to repeat, then hangs up. And teams are often too quick to blame the dialer, when the cause is almost always on the rep's own setup.

What is the best setup for good VoIP call quality?

An Ethernet cable, a wired USB headset and a computer that does nothing else during calls.

1. Ethernet connection (cable) rather than Wi‑Fi.
2. Wired USB headset, with the mic close to your mouth.
3. Unneeded browser tabs closed.
4. No downloads or syncs running: Drive, OneDrive, updates, videos.

Key takeaway: if you only have time to fix one thing, plug in an Ethernet cable. It's the change that solves the most problems.

What audio problem do you have exactly?

Each symptom has a different cause, so a different first test. "It doesn't work" isn't enough to find the fix.

How do you find the cause of bad call audio in 5 tests?

Run these tests in order, changing only one thing at a time. Otherwise you won't know what fixed the problem.

1. Switch to your phone's hotspot, or another stable connection. If the audio is fine again, the problem comes from the office Wi‑Fi or router, not the dialer.
2. Plug in an Ethernet cable and turn off Wi‑Fi.
3. Turn off the VPN. Many VPNs slow calls down, and some block VoIP entirely.
4. Try another headset, ideally a wired USB one.
5. Try another computer with the same headset. If the problem follows the computer, it comes from the browser or an installed app.

Each time, note the time of the call and what you changed: it will help if you need to contact support.

To test your network, run networktest.twilio.com. If an indicator turns red, the problem almost always comes from the connection.

How do you avoid audio problems day to day?

By getting three things right: the network, the headset and the browser settings.

Which network should you call on?

• Avoid guest Wi‑Fi and networks shared by the whole office. You need a connection that is fast and stable: a speed test doesn't show the micro-dropouts that happen during a call.
• When working remotely, sit close to the router and keep your phone's hotspot as a backup.

Which headset should you choose?

• A wired USB headset built for calls gives better results than a high-end music headset. Bose, Sony or AirPods are designed for music and commuting, not for a full day of sales calls (up to 100 an hour with a parallel dialer).
• If you use a Bluetooth headset, plug in the manufacturer's dongle instead of pairing it with the computer's built-in Bluetooth.
• Don't use your laptop's built-in mic in an open office: it picks up all the noise around you.

Which dialer and browser settings should you check?

• In the dialer, select your headset as both microphone and audio output.
• Allow microphone access for the right site.
• Keep your browser up to date.

When should you contact dialer support?

When the audio is still bad after the setup and the 5 tests. To help support find the cause quickly, send:

• the exact time of the call;
• what happened (robotic voice, echo, delay…);
• what you have already tested;
• your browser and your headset.

FAQ

Why does my voice sound robotic on a VoIP call? Almost always because of the connection: it is dropping parts of the call. Test with your phone's hotspot first, then with an Ethernet cable.

Is Wi‑Fi good enough for VoIP calls? Yes, if it is stable and not just fast. For calling all day, an Ethernet cable is the safer choice.

Do you need an expensive headset for cold calling? No. A wired USB headset built for calls sounds better than a high-end music headset. If you use Bluetooth, plug in the manufacturer's dongle.

How do you know if the audio problem comes from the dialer? If the problem persists on two networks, with two headsets and on two computers, it probably comes from the dialer. Contact support with the exact time of the call.