Telecommunications for Disaster Relief (TDR)
is a proposal by the International Telecommunications Union
to establish worldwide standards of interoperability and availability of emergency communications. The notion of establishing such standards was spurred in part by the 2004 Indian Ocean earthquake
and the subsequent tsunami
which devastated Indonesia
Reportedly, Verizon proposed that an international country code of +999 be set aside for use in development and research into TDR. As of 2005, there are no allocated phone numbers in that space.