Voice quality testing: a practical test plan

Voice testing should reproduce the paths and behaviours that matter: internal calls, carrier calls, Wi-Fi movement, VPN users, transfers, queues, DTMF, and peak-hour congestion.

Test record

Capture the endpoint, network, codec, direction, time, call duration, packet loss, jitter, delay, subjective result, and any SIP or RTP evidence. Repeat tests across locations and busy periods.

Acceptance questions

• Can both parties hear and speak throughout the call?
• Are there gaps, clipping, echo, or talk-over?
• Do DTMF, transfers, hold, and recording work?
• Does the call survive expected roaming or network changes?
• Do alarms and monitoring detect a controlled failure?

Do not accept a single successful call as proof of readiness. Test the failure modes and the recovery path.

Related: QoS, packet captures, and Wi-Fi voice.