<ul><li><a href=https://bip.uke.gov.pl/przeglad-rynkow/ target=_blank>Decision of the Office of  Electronic Communications(Commission Delegated Regulation (EU) 2021/654 of 18 December 2020 supplementing Directive (EU) 2018/1972 of the European Parliament and of the Council by setting a single maximum Union-wide mobile voice termination rate and a single maximum Union-wide fixed voice termination rate, 18.12.2020)</a></li><li><a href=https://isap.sejm.gov.pl/isap.nsf/DocDetails.xsp?id=wdu20041711800 target=_blank>Telecommunication Act(Ustawa Prawo telekomunikacyjne, Dz.U. 2004 nr 171 poz. 1800, Dz. U. z 2017 r. poz. 1907, 2201, z 2018 r. poz. 138, 650., 16 July 2004,  last updated on 3 March 2022, Article 34)</a></li></ul>