Symptoms
Not able to join the meetings via WEBRTC from outside the corporate network
Diagnosis
- CMS setup is single combined with dual domain.
- Taken the inbound packet capture from Expressway Edge.
- Traffic Flow -: Guest PC (Chrome Browser) -> Internet -> Expressway Edge -> CMS Server
- I could also see from the analysis that the client is not receiving any response from the STUN requests sent to the Expressway-E public IP on port 3478.
- Verified the port status from the internet and found connections are closed.
Solution
Ensured that the FW is allowing bi-directional traffic between the External WebRTC client and the Expressway-E’s Public IP on port 3478. Once made the changes, the issue got resolved
