In the Huawei collaboration solution architecture, the media processing layer is responsible for handling real-time media streams, including mixing, transcoding, recording, and streaming. The VP9860, as a Multipoint Control Unit (MCU), is a core component for mixing audio and video streams from multiple participants, which is a primary media processing function. The CloudRSE (Recording & Streaming Engine) is specifically designed to record conferences and stream them live or on-demand, another key media processing task. Therefore, both the VP9860 and CloudRSE are deployed at the media processing layer.

A. The SMC (Service Management Center) is a management and control component, operating at the management layer to handle device management, conference scheduling, and control, not media processing.

D. The Box 310 is a video conferencing endpoint/terminal. It belongs to the access layer, where users connect to the collaboration service.

1. Huawei HCIP-Collaboration V4.0 Training Material (2023).

Reference: Chapter 2

"Huawei Video Conferencing Solution Architecture

" Section 2.1. The architecture diagram and component descriptions explicitly place the MCU (e.g.

VP98xx series) and RSE (Recording & Streaming Engine) in the "Media Processing Layer" or "Service Layer." The SMC is shown in the "Management Layer

" and terminals like the Box series are in the "Access Layer."

2. Huawei CloudLink Video Conferencing Solution V600R019C10 Product Documentation.

Reference: "System Architecture" section. This document details the logical architecture

describing the function of each component. It specifies that the Media Exchange Unit (which includes MCU and RSE functionalities) is responsible for media processing services such as multipoint conferencing and recording.

3. Huawei VP9800 Series MCU Product Datasheet.

Reference: "Product Features" section. The datasheet describes the VP9860's core functions as "powerful media processing capabilities

" including 1080p60 full encoding/decoding and audio/video mixing

confirming its role in the media processing layer.