Unable to use meet.jit.si behind Corporate firewall

I have set up my own Jitsi Meet Server. Everything works so far. Thank you for this great software at this point. But I have a problem with some users behind a corporate firewall.

I know that you can only connect to the Internet through your proxy server cluster (unknown product). All direct communication in the firewall is blocked. With Jitsi you can join the channel, but you can’t see or hear anything.

We tried a few sessions on meet.jit.si, but we have the same behavior. External clients are fine, but no connection is possible from this company.
Do you think there is a chance to configure my own server to work in such an environment? Without changes to the rules in this firewall, bevause they don’t want to do this.

Thank you.

Facing same problem, did you figured out something?