regulated roaming call
as defined in Regulation (EU) No 531/2012 of the European Parliament and of the Council of…, Article 2(2), point (h) (Definitions)
a mobile voice telephony call made by a roaming customer, originating on a visited network and terminating on a public communications network within the Union or received by a roaming customer, originating on a public communications network within the Union and terminating on a visited network