Artikel 105

1. The following entities shall be invited to participate in the plenary sessions and committee meetings of Congress, the Council of Administration and the Postal Operations Council as observers:
1.1 the United Nations;
1.2 Restricted Unions;
1.3 members of the Consultative Committee;
1.4 entities authorized to attend Union meetings as observers by virtue of a resolution or decision of Congress.
2. The following entities, if duly designated by the Council of Administration in accordance with article 107.1.12 shall be invited to attend specific meetings of Congress as ad hoc observers:
2.1 specialized agencies of the United Nations and other intergovernmental organizations;
2.2 any international body, any association or enterprise, or any qualified person.
3. In addition to the observers defined in paragraph 1 of this article, the Council of Administration and the Postal Operations Council may designate ad hoc observers to attend their meetings in accordance with their Rules of Procedure, when this is in the interests of the Union and its bodies.