A system for access to multimedia structures has telephone sets capable of connecting to a telephone network, a storage device capable of storing a plurality of multimedia structures representing messages and/or data and/or commands, and a network access server that can be associated with the telephone sets and is capable of selectively instantiating the multimedia structures via an interconnection network. There is also a voice-recognition and speech-synthesis system that can be associated with the network access server and that comprises modules for reading files in XML format and for processing the files so as to obtain files in a format that can be synthesized by a speech synthesizer.