This Recommendation defines an Intelligent Network "Capability Set 1 " (IN CS-1) compliant stage 2 description of Universal Personal Telecommunication (UPT). It does not in any way provide an implementation or technology-dependent description. It identifies the functional capabilities and information flows needed to support the service for UPT Service Set 1 on IN CS-1, the initial phase of UPT introduction, as defined in Recommendations F.850 [1] and F.851 [2]. Recommendation F.851 [2] categorizes the functionality into essential and optional. Not all the features of Recommendation F.851 [2] can be supported by existing networks. This Recommendation includes only those service features achievable with current ITU-T signalling Recommendations. Networks not supporting existing ITU-T signalling Recommendations may be unable to provide all the features in this Recommendation.