Hi all, I am not a Jitsi dev, but still:
regarding the question
a) is that version (2.4.4997-1) a release you consider suitable for
by Daniel Pocock, I think the answer is no because of a bug discussed in the users mailing list, see
so i think that to do to get Jitsi to work on Debain Wheezy another release will have to be chosen. Hope it helps.