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Microsoft Teams Direct Routing Not Working (2026 Ultimate Fix Guide)
Microsoft Teams Direct Routing is a critical feature for enterprise voice integration. When it fails, calls cannot connect between Teams and PSTN.
This guide provides deep technical troubleshooting including SBC, SIP, and network configuration.
🔍 Common Direct Routing Issues
- SIP signaling failure
- SBC misconfiguration
- TLS certificate issues
- Firewall blocking traffic
⚡ Step 1: Basic Checks
- Restart SBC
- Check Teams service status
📡 Step 2: Verify SBC Configuration
- Check FQDN configuration
- Verify TLS certificates
- Ensure correct IP routing
📞 Step 3: Check SIP Signaling
- Use SIP logs
- Verify INVITE messages
- Check response codes
🔥 Step 4: Firewall Configuration (High-CPC)
- Open required ports
- Allow SIP traffic
🏢 Step 5: Admin-Level Troubleshooting
Check Voice Routing Policies
- Teams Admin Center → Voice → Routing
Check PSTN Connectivity
Ensure external calls are reachable.
⚠️ Common Mistakes
- Incorrect SBC config
- Expired certificates
🔗 Internal Links
❓ FAQs
Why Direct Routing not working?
Due to SBC or SIP configuration issues.
How to troubleshoot Direct Routing?
Check SBC logs and SIP signaling.
📌 Conclusion
Fixing Direct Routing requires deep technical knowledge of SIP, SBC, and network configuration.
