Ideally, you want to make sure that you have a 'complaint friendly' environment. While publicizing the fact that you have a hotline and other avenues for complaints - such as employees' immediate supervisors and HR - you also need to make sure that people understand confidentiality and retaliation. People will not come forward to use whatever avenue you've identified (and more ways to complain are better), unless they know that their complaint will be kept confidential and that retaliation claims will be taking seriously. If certain people in the organization - such as O'Reilly and Roger Ailes at Fox - are viewed as untouchable, people won't complain. Employees need to see visible signs that harassment policies have teeth and will be enforced. Of course, termination of the harasser is always the most tangible sign of action but that may not be the only way, nor may it be appropriate for certain transgressions.