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Microsoft Teams PSTN Call Quality Issues (2026 Ultimate Fix Guide)
Poor PSTN call quality in Microsoft Teams can lead to dropped calls, echo, jitter, and bad user experience. This guide provides deep troubleshooting including network, QoS, and enterprise-level fixes.
🔍 Common PSTN Call Quality Issues
- Audio delay (latency)
- Jitter or choppy audio
- Packet loss
- Echo issues
- One-way audio
⚡ Step 1: Basic Troubleshooting
- Restart Teams
- Restart system
- Check headset
🌐 Step 2: Network Optimization (High-CPC Topic)
Recommended Network Requirements
- Latency: < 100 ms
- Packet loss: < 1%
- Jitter: < 30 ms
Pro Tip: Use wired Ethernet for best performance.
🎯 Step 3: Enable QoS (Quality of Service)
QoS prioritizes Teams traffic over other applications.
- Configure DSCP values
- Prioritize voice packets
🚫 Step 4: Avoid VPN
VPN increases latency and reduces call quality.
🏢 Step 5: Admin-Level Troubleshooting
Check Direct Routing / Operator Connect
- Verify SBC configuration
- Check SIP signaling
Monitor Call Analytics
Use Teams Admin Center → Call Analytics
⚠️ Common Mistakes
- Using Wi-Fi instead of LAN
- Ignoring QoS setup
- Using low-quality headsets
🔗 Internal Links
❓ FAQs
Why is Teams call quality bad?
Due to network latency, jitter, or packet loss.
Does QoS improve Teams calls?
Yes, it prioritizes voice traffic.
📌 Conclusion
Improving PSTN call quality requires network optimization, QoS configuration, and proper device setup.
