Explanation A CTI adapter is a software component that connects Salesforce to a phone system and enables features such as click-to-dial, screen pop, call logging, and call transfer. A call center definition file is an XML file that defines the settings and behaviors of the CTI adapter for Salesforce users. Both of these are key considerations for integrating a phone system with the Salesforce Service Console. Verified References: Salesforce Help: CTI Adapters and Salesforce Help: Call Center Definition Files