Most (but not all) Telepathy components use the freedesktop bugzilla.

• Empathy uses the Gnome Bugzilla.
• See all open Telepathy bugs in the freedesktop bugzilla.
• File a new bug against the Telepathy component in the freedesktop bugzilla. If you're looking for some bugs to fix as a starting point for getting involved, take a look at the Empathy bugs tagged with ‘gnome-love’ or Telepathy bugs tagged with ‘love’. Feel free to drop by #empathy on Gnome IRC or #telepathy on Freenode!