The settings of CoWork Calls are set by default so that conferences via voice and video immediately work GDPR-compliant if all participants have a connection to the internet. For the negotiation of the voice and video connection, an STUN server1) is required, which is pre-populated with services located in Germany. The actual voice and video connection then takes place exclusively on secured channels between the participants.
If the negotiation of the connection is also to take place in the local network or via other, private servers, the default setting can be changed.
At least one STUN server is required to exchange connection data between the participants of a call. The STUN servers are asked for information on which IP and port the respective client could be reached. The clients then set up their own network among themselves, over which voice and video are transmitted in encrypted form.
Examples of public STUN servers can be found here.
To revert back to the default servers, all servers can be removed and then saved.
Note: No more than 5 servers should be entered, because otherwise the connection setup can be negatively affected.