This Recommendation specifies requirements for a disaster relief mobile message service. After a disaster occurs@ many people want to contact their immediate family@ relatives or friends to report their condition. In many cases@ communication is via telephone over the mobile or fixed telephone network. However@ due to a large population of users attempting to make similar calls@ they often fail to get through due to heavy network congestion. In contrast@ the characteristics of Internet protocol (IP) packet networks are such that@ although localized congestion may occur@ the user does not experience blocking to the extent that communication is fully cut off@ but still has the ability to transfer information@ although with possibly reduced throughput. As an alternative to using a mobile or fixed telephone network after disasters occur@ an IP-based disaster relief message service provided through the mobile network enables people to inform their friends and family members of their safety or of damage conditions.