a Postal service All postal services, whose scope is determined by the bodies of the Union. The main obligations of postal services are to satisfy certain social and economic objectives of member countries, by ensuring the collection, sorting, transmission and delivery of postal items. b Member country A country that fulfils the conditions of article 2 of the Constitution. с Single postal The obligation upon the contracting parties to territory the UPU Acts to provide for the reciprocal (one and the same exchange of letter-post items, including postal territory) freedom of transit, and to treat postal items in transit from other countries like their own postal items, without discrimination. d Freedom of Obligation for intermediate postal transit administrations to transport postal items passed on to them in transit by another UPU postal administration, providing similar treatment to that given to domestic items. e Letter-post item As described in the Convention. f International Postal operations or services regulated by the postal service Acts; set of these operations or services.