From the NCAA website:
Contact period - permissible for authorized athletic department staff members to make in-person, off-campus recruiting contacts and evaluations.
Dead period - not permissible to make in-person recruiting contacts or evaluations on- or off-campus or permit official or unofficial visits.
Evaluation period - permissible for authorized athletics department staff to be involved in off-campus activities to assess academic qualifications and playing abililties. No in-person, off-campus recruiting contacts with a prospect are permitted.
Quiet period - permissible to make in-person recruiting contacts only on the member institution's campus.