First, a suggestion:
How about linking to video tutorials that demonstrate core Jitsi
functionality from the FAQ page of the wiki?
1. How to download & install Jitsi:
2. Your first ZRTP voice call with Jitsi:
3. Your first OTR text chat with Jitsi:
Second, some pages of the wiki need some love - e.g.
https://jitsi.org/index.php/Documentation/ZrtpFAQ has a few
typos/misspellings - can I get edit rights to the wiki to correct them, or
would you like a full list in an email to this list?
s/Thise protocols is/These protocols are
s/in clear/in the clear
s/are regarded insecure/are considered insecure