This is from:
http://portal.hud.gov/hudportal/HUD?src=/program_offices/housing/sfh/nsc/qasscra1"All mortgage loans, including conventional mortgages and mortgages insured by HUD are subject to the notification requirement that became effective June 5, 2006. The notice must:
Be sent to all homeowners who are in default on a residential mortgage;
Include the toll-free military one-source number to call if servicemembers or their dependents require further assistance (1-800-342-9647); and
Be made within 45 days from the date a missed payment was due, unless the homeowner pays the overdue amount before the expiration of the 45-day period."