Wi-Fi voice troubleshooting

Wi-Fi voice quality depends on radio conditions as well as IP routing. A strong signal alone is not enough: airtime contention, interference, roaming gaps, retransmissions, power-save behaviour, and access-point capacity can all affect a call.

Check in this order

1. Confirm the handset is on the intended SSID and VLAN.
2. Check signal, noise, channel utilisation, and retry rates where available.
3. Look for roaming events and authentication delays during movement.
4. Compare voice symptoms with busy periods and nearby non-voice traffic.
5. Measure packet loss, jitter, and delay from the handset path to the media edge.
6. Verify QoS markings and queue treatment across the wireless and wired network.

Avoid solving a capacity problem by simply increasing transmit power. That can enlarge cells, increase contention, and make roaming decisions worse. Design and validate against the handset model, building, and traffic pattern.

Related: QoS and call quality, networking layers, and packet captures.