Cascading in videoconferencing refers to?

• A. Upgrading to fiber optic cables.
• B. Replacing MCU with a different vendor.
• C. Reducing the number of participants to fit single MCU.
• D. Joining another MCU into a session hosted by the primary MCU.

Answer: (D)

Cascading expands the conference capacity by linking another MCU into the session hosted by the primary MCU. The main MCU continues to host the call, while a second MCU is joined into that same session to extend reach and handle additional endpoints or streams. This setup allows more participants and greater scalability than a single MCU could support. It’s not about upgrading cabling, swapping vendors, or simply reducing participant count; those options don’t describe the mechanism of adding another MCU into an ongoing conference.