VICIdial Error: WebRTC Connection Failed — Cause & Fix

Error Summary

Error Message

WebRTC Connection Failed

Severity

Critical

Component

Web

What Causes This Error

The browser-based WebRTC softphone cannot establish a connection to the Asterisk server. Causes include: WSS (WebSocket Secure) port not open or blocked by firewall, SSL certificate issues with the WebRTC endpoint, STUN/TURN server not configured, browser doesn't support WebRTC, or Asterisk res_pjsip_transport_websocket module not loaded.

How to Fix It

  1. 1
    Check if WebSocket port (8088/8089) is accessible from agent browser: nc -zv VICIDIAL_SERVER 8089
  2. 2
    Verify SSL certificate is valid for the VICIdial hostname: openssl s_client -connect HOSTNAME:8089
  3. 3
    Check Asterisk has pjsip_transport_websocket: asterisk -rx 'module show like websocket'
  4. 4
    Verify firewall allows port 8089 from agent IPs: iptables -L | grep 8089
  5. 5
    Check http.conf: cat /etc/asterisk/http.conf — enable=yes, bindport=8088
  6. 6
    Load missing module: asterisk -rx 'module load res_pjsip_transport_websocket.so'
  7. 7
    Test from agent browser: open browser console and check WebSocket connection errors

How to Prevent It

Monitor WebRTC connection success rate in agent login reports. Use a wildcard SSL certificate to avoid certificate mismatch issues. Document WebRTC browser requirements for agents. Test WebRTC after any firewall changes.

Critical Phone Login Not Active Web Critical Agent Screen Blank Web Critical SIP Registration Failed Asterisk

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Frequently Asked Questions

What causes the VICIdial "WebRTC Connection Failed" error?
The browser-based WebRTC softphone cannot establish a connection to the Asterisk server. Causes include: WSS (WebSocket Secure) port not open or blocked by firewall, SSL certificate issues with the WebRTC endpoint, STUN/TURN server not configured, browser doesn't support WebRTC, or Asterisk res_pjsip_transport_websocket module not loaded.
How do I fix the VICIdial "WebRTC Connection Failed" error?
Check if WebSocket port (8088/8089) is accessible from agent browser: nc -zv VICIDIAL_SERVER 8089 Then: Verify SSL certificate is valid for the VICIdial hostname: openssl s_client -connect HOSTNAME:8089 Then: Check Asterisk has pjsip_transport_websocket: asterisk -rx 'module show like websocket' Then: Verify firewall allows port 8089 from agent IPs: iptables -L | grep 8089 Then: Check http.conf: cat /etc/asterisk/http.conf — enable=yes, bindport=8088 Then: Load missing module: asterisk -rx 'module load res_pjsip_transport_websocket.so' Then: Test from agent browser: open browser console and check WebSocket connection errors
How can I prevent the "WebRTC Connection Failed" error in VICIdial?
Monitor WebRTC connection success rate in agent login reports. Use a wildcard SSL certificate to avoid certificate mismatch issues. Document WebRTC browser requirements for agents. Test WebRTC after any firewall changes.