Possibly, additional hardware has been supplied by the PTT (french Postal, Telephone, Telecommunications service)...?
== Translated info from french cpcruletcpcrulez.fr ==
LORITEL is certainly one of the oldest linkage maps from computers AMSTRAD to Minitel. Associated with a relatively powerful software, LORITEL offers four main options: DIALOGUE ISSUE, TRANSFER, BACK. DIALOGUE gives access to four options entitled: Network Télétel, Manual, Automatic, Liaison Minitel.