In this article we present the process and results of the research on workload assessment of the customer consultant in call center. The study was conducted in two enterprises, which are responsible for operating helplines of two telecommunications companies. The problems of working conditions and organisation of work as well as the risks of potentially harmful factors and psychosocial burdens were diagnosed. The diagnosis was based on the questionnaire study. Furthermore, we have researched areas, in which legal regulations are not implemented, which may potentially increase the workload. In order to do this the checklist was applied. The research results coincide with each other and let us characterise the workload of the call center customer consultant's workstand and formulate the proposals of preventive action.