Starting from the local names policy:

1) the source country decides on a conversion system from one script to another, or	the source country might not have the means to produce a standard
2) the receiver country decides, or	there are more than 160 receiver countries and we do not want 160 versions of each geographical name [including Kosovo, we count 196 fully independent countries now]
3) both source country and receiver countries try to work out one joint standard for each writing system	cooperation of source country and receiver countries might work out best