Karalee is correct - HipChat Server is self-contained, meaning that it will work for the local network without Internet connectivity.
Keep in mind that some functionality like mobile notifications, video calls and certain integrations that require access to 3rd party services might not work.
Video functionality will not work in a fully isolated environment.
See the Network Requirements for Video in HC Server docs: https://confluence.atlassian.com/hc/video-chat-and-screen-sharing-610435345.html#VideoChatandScreenSharing-Networkrequirements
...have mention name FirstnameLastname. Fe.: @MaartenCautreels This certainly helps to know who is being mentioned in a conversation. Imagine your colleague sends the following message...
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