# The Data Retention Regulations 2014, Paragraph 15: Data necessary to identify users’ communication equipment (or what purports to be their equipment)


(1) In the case of dial-up access, the calling telephone number.
(2) In any other case, the digital subscriber line (DSL) or other end point of the originator of the communication.

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Source: https://www.legislation.gov.uk/ukdsi/2014/9780111118894/schedule/paragraph/15 (the official version)
Page: https://openlegislation.uk/draft-data-retention-regulations-2014/schedule/paragraph-15
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.