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Microsoft Teams One-Way Audio Issue (2026 Ultimate Fix Guide)
One-way audio in Microsoft Teams calls is a critical issue where one user can hear the other, but not vice versa. This is common in VoIP environments and usually linked to network, firewall, or routing problems.
🔍 Common Causes
- Firewall blocking UDP traffic
- NAT configuration issues
- Incorrect audio device
- VPN interference
- QoS misconfiguration
⚡ Step 1: Basic Troubleshooting
- Restart Teams
- Check microphone and speaker
- Test with another device
🌐 Step 2: Network Troubleshooting
Check NAT Configuration
Ensure NAT allows bidirectional traffic.
Check Bandwidth
- Minimum 1.5 Mbps
🔥 Step 3: Firewall Configuration
- Allow UDP ports 3478–3481
- Ensure outbound traffic allowed
🚫 Step 4: Disable VPN
VPN can block audio streams.
🏢 Step 5: Admin-Level Fix
Check Call Analytics
Teams Admin Center → Call Analytics
Check QoS
Ensure voice packets prioritized.
🔗 Internal Links
❓ FAQs
Why is audio one-way in Teams?
Usually due to firewall or NAT issues.
How do I fix one-way audio?
Open required ports and check network configuration.
📌 Conclusion
Fixing one-way audio requires network and firewall optimization.
