The Video Call system is designed to work in as many different corporate/institutional networks as possible, with little-to-no need for special network configuration.
Each Video Call user's desktop or laptop computer must have access to the Internet via secure port 443. This port is used for secure web browser communication and is the same access requirement as for other secure internet websites.
The Video Call Management Console's background real-time signalling uses secure Websockets in the first instance, and long-polling when Websockets cannot get through a proxy or firewall setting. Long-polling holds web connections open for up to 3 minutes, to allow messages to be sent to the user side as they occur.
Video Call relay servers - technically, Traversal Using Relays around NAT (TURN) servers - have several important functions:
The relay process cannot inspect the encrypted media data; it only forwards the data to the negotiated endpoint.
Relay servers are deployed in several regions, and the closest to participants is automatically used. Variable latency can occur, depending on the location of call participants in relation to the relay server being used for that call.
The Precall test will check the various network and device settings that are used in making a call.