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Phone Guides

Voice Quality

VoIP call-quality checklist

Before launch

  • Test internal, external, Wi-Fi, VPN, queue, transfer, DTMF, recording, and fax paths.
  • Confirm codec agreement and RTP reachability.
  • Measure loss, jitter, delay, and peak-period congestion.
  • Verify QoS markings and queue treatment.
  • Record a baseline and acceptance threshold.

During an incident

  • Capture the time, endpoints, direction, and symptom.
  • Check whether the problem affects signalling, media, or both.
  • Compare a working and failing call.
  • Inspect SDP and actual RTP flow.
  • Check Wi-Fi, WAN, firewall, SBC, and carrier events.

See the voice quality hub for detailed guides.

Voice quality testing: a practical test plan

Test VoIP quality with repeatable calls, realistic paths, controlled impairments, user scenarios, and measurable acceptance criteria.

VoIP QoS: latency, jitter, packet loss, and capacity

Learn how delay, jitter, packet loss, and congestion affect voice calls, and use a practical checklist to improve call quality.

Packet captures for VoIP troubleshooting

Use a small, repeatable packet-capture method to diagnose SIP failures, missing RTP, DTMF problems, and call-quality symptoms.