Janus WebRTC Gateway is used in several projects for Alcatel-Lucent Enterprise Rainbow platform, we would like to share our experience in module combining, orchestration and scalability to address several communication use-cases:

plugin-mixed architecture to address audio/video conferences with PSTN bridge to handle external users - use case to mix the plugins and to provide PSTN bridge;

large-grid video mode with external video mixer component - if a number of video participants in higher to 20, SFU mode could not be optimal especially on low resources computers, so MCU schema is proposed based on GStreamer component;

Webinar video mode and orchestration practices - use case with large-scale of audio video flows, how can provide an optimal decision to scale the system taking into account distributed conference with multiply instances.