Doing a simple " svn co https://svn.java.net/svn/jitsi~svn/trunk jitsi" works perfectly fine for me. Same with the source snapshots at https://download.jitsi.org/jitsi/nightly/src/ . We also had no issues getting our bugfixes into their upstream while we did all the testing. I was wondering about the "observer/member" thing they mention on the website as well, doesn't seem to be relevant though.