48According to that case-law, although periods of professional inactivity are inherent in on-call duty performed by workers where they are required to be physically present on the employer's premises, given that, unlike during normal working hours, the need for urgent interventions during such duty cannot be planned in advance and the activity actually performed depends on the circumstances, the decisive factor in considering that the characteristic features of the concept of ‘working time’ within the meaning of Directive 93/104 are present in the case of such on-call duty performed by a worker at his actual workplace is that he is required to be physically present at the place determined by the employer and to be available to the employer in order to be able to provide the appropriate services immediately in case of need. Those obligations must therefore be regarded as coming within the ambit of the performance of that worker's duties (see Simap, paragraph 48, and Jaeger, paragraphs 49 and 63).
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