The purpose of this Recommendation taking into account:that Videotex services have been implemented in different countries hegions using different data syntaxes referred to as Data Syntax I, Data Syntax II and Data Syntax III which have an equal status; that different countries are entitled to use their existing systems;that interworking between Videotex services in different countries may require transcoding and/or conversion;that the interworking between Videotex services may be provided by using different types of networks such as the public switched telephone network (PSTN), packet switched public data network (PSPDN),circuit switched public data network (CSPDN), integrated services digital network (ISDN), etc.;that Videotex interworking protocols should offer a large degree of compatibility with protocols used in other telematic services to facilitate the interworking of different Videotex services;to identify parameters needed to communicate with Videotex terminals:to provide technical recommendations desirable for potential interworking of other telematic services with Videotex services.