Which feature allows users to participate in conferences on the IPO Platform?

The Conference Bridge feature is specifically designed to facilitate conference calls on the IPO Platform. It allows multiple users to connect to a single call simultaneously, enabling audio conferencing where participants can engage in discussion. This feature effectively manages the conference by routing calls and maintaining the connections among participants.

While other options like the Call Manager and Group Call Scheduler may assist in call management and organizing group calls, they do not directly provide the necessary infrastructure for conferencing. The Virtual Meeting Room also refers generally to a virtual space for meetings but does not specifically denote the live connection capabilities like the Conference Bridge does. This makes the Conference Bridge the dedicated feature that specifically allows for multi-user participation in conference calls.