Can I talk to people on other servers?

Yes, with servers you approve.

Your private server connects only to servers on your approved list. Your Server Admin or Co-Admins manage that list, so you can talk with partners on their own servers while staying closed to everyone else. See What can each server role do?

Manage the approved list (Server Admin and Co-Admins)

1. Open GSN and go to Settings (see How do I open Settings?).
2. Under Administration, tap Whitelisted Servers.
3. To add a server, tap +, enter its address in Domain and tap Save.
4. Ask the other server's admin to add your server too. You can talk once both servers have added each other.
5. To remove a server, tap the trash icon next to it, then Remove.