If your company has a firewall which blocks connections to Voximplant cloud, you need to configure the firewall.
Ensure that your corporate firewall has the following ports and IP addresses in its whitelist. You can find all the IP addresses in one JSON file.
Web and mobile SDK traffic
8000-18000 UDP, 20000-30000 UDP, 443 TCP, 12093 TCP ports for Web gateways and media servers
443 port for load balancer. The balancer's IP addresses: