Telephone Preference Service is a Consumer Protection Scheme launched in 1995, consumers who do not wish to receive unsolicited telephone sales and marketing calls may register their telephone number with the TPS. It was created by the DMA together with the Glass and Glazing Federation (GGF), the Institute of Charity Fundraising Managers (ICFM), the Periodical Publishers Association (PPA), BT and Mercury. It is funded by BT and Mercury, and supported by the Office of Telecommunications and the Data Protection Registrar.