The article focuses on the work of a call center operating as an inquiry service in a major Russian city. Despite there are multiple studies of call centers within the critical studies of work, their focus traditionally lies on the managerial practices of control, while the “productive” part of work - its content and the professionalism of operators - often remains unstudied. This article examines a key part of the call center work: answering the callers' questions. Utilizing the methodology of conversation analysis to analyze the transcripts of calls, we demonstrate that the operators' work includes much more than simply reading a ready-made text from the database of answers. The operator performs the function of an interpreter, whose key task consists in establishing correspondence between the abstract information of the database and the unique life situations of the callers seeking help in the inquiry service. A professional operator is able to perform this job while balancing between often contradictory norms of everyday communication and the internal rules of the call center. Even though professionals in many spheres approach rules with flexibility, the specific of call center work implies that the professionalism of operators exists under the threat of being punished for deviating from the workplace instructions; the professionalism of operators cannot be institutionalized because of the requirement of standardization in a call center.