This Recommendation defines the technical requirements for interworking between the International Telex service and the videotex service, using a TelexNideotex Conversion Facility (VTXCF).
ITU-T U.206 FRENCH-1993 history
1993ITU-T U.206 FRENCH-1993 TECHNICAL REQUIREMENTS FOR INTERWORKING BETWEEN THE INTERNATIONAL TELEX SERVICE AND THE VIDEOTEX SERVICE