The invention concerns a data transmission terminal which, through exchange means (110, 120), sets up a communication with a corresponding terminal through the switched telephone network (STN) with transmission from one to the other indicating its accessibility through the INTERNET network, and an access characteristic which can be an INTERNET address, a cryptographic key. The active state of the exchange means is sensed by means (111) activating the means (112) for reading the memory (113). The invention is particularly applicable to telefax.
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