Your answer:
"A team is not obligated to grant another team permission to discuss employment with a high-level employee (GM, president or equivalent responsibilities) under contract. For other club employees who do not fall into the category of high-level employee, they may be interviewed for a GM position."
http://www.nj.com/jets/index.ssf/2014/12/what_are_the_nfl_rules_for_jets_upcoming_contact_with_coach_general_manager_candidates.html