No audio on FreePBX calls
Fix calls with missing sound.
| What you need | Affects |
|---|---|
| Admin access to the FreePBX admin panel, and router or firewall access | Calls with missing audio |
1. Check FreePBX
- NAT settingsIn Settings → Asterisk SIP Settings, check the external address and local networks.
- RTP portsCheck the RTP port range, often 10000–20000.
2. Check the network
- Open portsOpen the RTP range on your firewall to FreePBX.
- Turn off SIP ALGTurn off SIP ALG on your router.
- TestMake a test call each way.
Troubleshooting
| Problem | Likely cause and fix |
|---|---|
| Only outside calls affected | Usually NAT settings or SIP ALG. |
| Only remote phones affected | Check the remote network and your firewall rules. |