Which of the following describes the capability of 3CX towards dialing operations with supported IP Phones?

The capability of 3CX that enables remote control via CTI (Computer Telephony Integration) is a key feature that enhances the functionality of supported IP phones. This allows users to manage calls from their computers, providing a seamless integration of telephony services with their desktop applications. With CTI, operations such as answering calls, transferring them, and initiating new calls can be performed directly from a computer interface, making it convenient and efficient for users.

This feature allows for improved workflow and productivity, especially in environments where call management is critical. It eliminates the need for physical interaction with the phone for various operations, thus optimizing communication processes.

Other options do not capture the full capability of 3CX regarding dialing operations. For instance, while conference calls are a feature of 3CX, it does not encompass the broader functionalities offered by CTI. Similarly, supporting multiple phone lines and requiring physical access may not accurately represent the full capabilities of remote operation and integration into users' workflows that CTI provides. Thus, the inclusion of remote control via CTI highlights a significant advantage of using 3CX with supported IP phones.