The json.org java library is non-free according to Debian and maybe also other distros. As long as jitsi depends on json.org it can not enter the Debian archive.
Hello and thanks for your report!
Note however that as our "Bugs and Issues" page  explains, we expect reports to be submitted in the issue tracker once they have been discussed and confirmed as such on our dev mailing list . This is really important to us and we've tried to made it clear throughout the site. You may also like to check the following page  for the rationale behind our decision.
For all these reason I'll be marking this issue as Incomplete. Feel free to repost it on email@example.com and we will of course reopen it if necessary.
P.S. On a side note, we would be interested to know how you reached the issue tracker without seeing any of the notes where we ask users not to submit issues without discussing them with the developers first.