Which solution ensures consistent call control functionality across both Service app and Service Cloud console?

The choice of Open CTI Implementation is correct because it provides a standardized way to integrate telephony systems directly with Salesforce. Open CTI allows for consistent call control functionality irrespective of the environment—whether users are operating within the Service app or the Service Cloud console. By utilizing web standards, Open CTI enables seamless interactions such as answering, transferring, and logging calls directly within either interface. This consistency is essential for providing agents with a unified experience, making it easier for them to handle customer interactions efficiently and effectively.

In contrast, the other options do not directly address the need for consistent call control functionality across both platforms. For instance, a Custom Developer Console may offer flexibility in development but lacks the specific telephony capabilities integrated into Open CTI. Salesforce Assistant is primarily designed to enhance user productivity through AI-driven assistance rather than providing direct call management features. Interaction Hub focuses on omnichannel engagement but does not specifically ensure call control consistency like Open CTI does. Thus, Open CTI stands out as the optimal solution for achieving unified call control across different Salesforce applications.