xmlns:atom="http://www.w3.org/2005/Atom" xmlns:atom="http://www.w3.org/2005/Atom"
Unaddressed printed matter
Addressed printed matter
Standard letter
Press advertising with order form
Catalogue
Telephone with human intervention
Telephone without human intervention (automatic calling machine, audiotext)
Radio
Videophone (telephone with screen)
Videotex (microcomputer and television screen) with keyboard or touch screen
Electronic mail
Facsimile machine (fax)
Television (teleshopping).