What feature of 3CX allows users to hold meetings?

The option that signifies the ability to hold meetings in 3CX is the web conferencing feature. This is specifically designed to facilitate virtual meetings by allowing users to share their screens, collaborate in real time, and engage in discussions through audio and video. Web conferencing integrates seamlessly with the 3CX system, enabling smooth scheduling and joining of meetings directly from the phone system or through a web browser.

In contrast, while the call transfer feature allows users to redirect calls to another extension or number, it does not offer the capabilities needed for meeting environments. The online chat feature is aimed at providing instant messaging functionalities, enabling quick communication, but it lacks the structured format required for formal meetings. Voicemail serves a completely different purpose, focusing on recording and storing messages left by callers. Thus, the web conferencing feature is essential for hosting engaging and interactive meetings, making it the correct answer.