There is an issue tracker for the project with bugs and feature requests in it. Please search to see if your bug or feature request is here before posting about it:
http://www.eflo.net/VICIDIALmantisTo see a list of items that have changed or are being worked on, look at the TODO page:
-- in progress --
There is an SVN server of the current codebase. Instructions for accessing it are here:
http://wiki.vicidial.org/doku.php?id=svnIf you are using the SVN 2-X code, you can see a description of the major changes since the last release in the UPGRADE document in the trunk root directory.