الغرف الصوتية والتواصل في الألعاب

High-volume live rooms / voice rooms (in-room fan-out is O(online members))

RTC signaling: 1-on-1 / multi-party / PK battle (signaling only — media & game state stay in your engine)

Redis-backed call state for multi-instance deployment and failure cleanup

Gift messages and effects

Presence, lobby and matchmaking chat

In-game IM: squad groups / guild channels / cross-server

Content moderation / sensitive-word filtering