Callsign allocation from the ITU is administered by national political authorities and international mandates .
It is a story of transition , compromise , and internationally unrecognized operation to follow the history of such allocations in the 20th century in this area .
Since callsign allocation from the ITU is administered by national political authorities and international mandates , it is a story of transition , compromise , and internationally unrecognized operation to follow the history of such allocations in the 20th century in this area .