The goal of this study to determine what factors influence the job satisfaction amongst the telemarketers from Call Centre in Spain. We developed a suitable methodology to write a questionnaire, which was filled-in by telemarketers from different companies. By means of a thorough analysis of those completed surveys, we got some important results and conclusions. We have found that job satisfaction in Call Center companies, is an important factor that influences the service they provide to users. We also concluded that the job satisfaction of telemarketers in this sector is especially related to the marital status and educational level.