This Recommendationdefines the stage 1of the teleaction servicefor the Integrated ServicesDigital Network (ISDN) as provided by the public telecommunication operators or recognized operating agencies.Stage 1 is an overall service description from the user’s point of view (see Recommendation 1.130 [i]), but does not deal with the details of the human interface itself.This Recommendation defines the interworking requirements for teleaction services supported by networks other than ISDN with the teleaction services describedin this Recommendation.This Recommendation does not specifj the additional requirements where the service is provided to the user via a telecommunicationsnetwork that is not ISDN but does include interworking requirements of other networks with the public ISDN.Charging principles are outside the scope of this Recommendation.This Recommendation is applicable to the stage 2 and stage 3 Recommendations for the ISDN teleaction service. The terms “stage 2” and “stage 3” are defined in Recommendation 1.130[l].Where the text indicates the status of a requirement (i.e. as strict command or prohibition, as authorization leaving freedom, or as a capability or possibility),this shall be reflected in the text of the relevant stage 2 and stage 3 Recommendations.Furthermore, conformanceto this Recommendationis met by conforming to the stage 3 Recommendationwith the field of application appropriate to the equipment being implemented. Therefore, no method of testing is provided in this Recommendation.