You may need to ask your I.T. department to allow outbound traffic to the Easymeeting services. This is because firewall’s with strict configurations block access to the public Internet on high ports typically used for video streams.
Your PC must be able to connect outbound to Easymeeting's services on destination port range 20000 - 30000, TCP and UDP. If these ports are blocked, your WebRTC client will fail to connect properly.
But that's a big port range to open!
We understand your concern, but your network administrator can restrict the port range to the Fully Qualified Domain Name (FQDN) services.easymeeting.
This will restrict video conferencing traffic from your WebRTC clients using destination ports 20000-30000, TCP and UDP, to only work with I.P. addresses contained within the services.easymeeting.net FQDN.