The document refers to the relevant CCITT recommendations for international interworking between videotex gateways. It defined no additional function. However, optional features of CCITT T.504, CCITT T.541 and CCITT T.523 are specified in more detail.
DIN ETS 300107:1992 history
1992DIN ETS 300107:1992-09 Terminal Equipment (TE); international videotex interworking between gateways; english version ETS 300107:1991
1992DIN ETS 300107:1992 Terminal Equipment (TE); international videotex interworking between gateways; english version ETS 300107:1991