Question 21/I - New services on the ISDN (revised, previously Question 15/I) Considering that (a) the ISDN is being implemented in a number of countries; (b) existing services on dedicated networks are being transferred on the ISDN; (c) Recommendation F.353 contains a guideline for the provision of Telematic and data transmission services on the ISDN; (d) the ISDN offers a wide range of possibilities for -integration of different existing services (e.g. Teletex and facsimile services), -integration of new applications (e.g. multi media, audio visuals and interactive applications), - the use of multi functional terminals; (e) the ISDN offers a wide range of possibilities for new voice oriented services and facilities, the following should be studied: What new and/or revised services should be defined to be offered on the ISDN? Note - The study of this Question should cover services such as: - audio visual services - teleaction services - additional packet mode bearer services - intelligent network services - mobile network services - maintenance and management services - universal personal telecommunication services - multi media applications. Note - This Question should be studied in close conjunction with Question 23/I.