Artikel XVIII

a) Any State whose telecommunications Administration or Recognized Private Operating Agency was, or had the right to become, a signatory Party to the Provisional Agreement at the date on which the Convention is opened for signature, may accede to the Convention from the date on which it ceases to be open for signature, until two years after its entry into force.
b) The provisions of paragraphs c) to e) of this Article shall apply to requests for accession by the following States: i) a State whose telecommunications Administration or Recognized Private Operating Agency was, or had the right to become, a Signatory Party to the Provisional Agreement at the date on which the Convention was opened for signature, which has not become a Party to the Convention in accordance with subparagraphs i) or ii) of paragraph a) of Article XVI of the Convention, or paragraph a) of this Article;
ii) any other European State which is a member of the International Telecommunication Union wishing to accede to the Convention after its entry into force.
i) a State whose telecommunications Administration or Recognized Private Operating Agency was, or had the right to become, a Signatory Party to the Provisional Agreement at the date on which the Convention was opened for signature, which has not become a Party to the Convention in accordance with subparagraphs i) or ii) of paragraph a) of Article XVI of the Convention, or paragraph a) of this Article;
ii) any other European State which is a member of the International Telecommunication Union wishing to accede to the Convention after its entry into force.
c) Any State that wishes to accede to the Convention in the circumstances mentioned in paragraph a) of this Article (“the Applicant State") shall so notify the Executive Secretary in writing and shall supply the latter with all information relevant to the application.
d) The Executive Secretary shall receive the application of the Applicant State and shall submit the same to the Assembly of Parties.
e) The Assembly of Parties shall take a decision on the Applicant State's request within six months following the date on which the Executive Secretary decides that he or she is in possession of all the information required under paragraph c) of this Article. The decision of the Executive Secretary shall be promptly notified to the Assembly of Parties. The decision of the Assembly of Parties shall be taken by secret vote and in accordance with the procedure for decisions on matters of substance. An extraordinary meeting of the Assembly of Parties may be convened for this purpose.
f) The Executive Secretary shall notify the Applicant State of the conditions for accession established by the Assembly of Parties, which shall be the subject of a protocol annexed to the instrument of accession to be deposited by the said State with the Depositary.