In the digital era, advanced information and communication technologies (ICTs) have steered pure offline and online retailers towards omnichannel retailing. This conceptual paper tries to explore the customer engagement behavior, a critical factor in establishing customer-firm relationship, in the context of omnichannel retailing. The study selects channel integration quality and customer satisfaction to explore their effects on customer engagement behavior based on Stimulus-Organism-Response (SOR) model. In addition, omnichannel compatibility is included as a boundary condition to the relationship between channel integration quality and its consequences. The proposed model will possibly help omnichannel retailers achieve a high level of customer support and enrich the existing research on omnichannel retailing.