The knowledge mechanisms of call centers have been emphasized by many pervious studies. Yet there is little empirical research that examines the call centers' influence on firms' combinative capabilities. To address this gap, this study examines call center enabled organizational mechanisms that contribute to the firms' combinative capabilities. The study identifies differential effects from three types of combinative capabilities including system capabilities, coordination capabilities, and socialization capabilities. Through in-depth case studies of four Taiwanese call centers, this study finds seven organizational mechanisms including centralized information deployment and knowledge encapsulation, institution changing and foolproof, information hub and relationship management, decision making ladder, training center, network configuration, and job embeddedness . The findings provide practical implications to industry managers engaged in call center implementations from a combinative capabilities perspective. Future research directions are also discussed.