Regarding voluntary measures, ICAO has already developed a template (pdf) for voluntary agreements between the aviation sector and public sector organizations.
This call for States to provide information was sent to all States on 3 October 2006 and renewed on 2 December 2009. Some States had replied to the first State Letter as of 7 December 2006. The information submitted, as well as the information collected prior to February 2007 is available here (pdf). A second State Letter has requested submission of an updated questionnaire by 31 December 2009. Click here to view the latest responses.
ICAO welcomes submissions regarding voluntary activities at any time, in order to ensure that a wide sample of information is collected.