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53 lines
2.8 KiB
Markdown
53 lines
2.8 KiB
Markdown
# VoIP Conferencing
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This is a draft proposal for a naive voice/video conferencing implementation for
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Matrix clients. There are many possible conferencing architectures possible for
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Matrix (Multipoint Conferencing Unit (MCU); Stream Forwarding Unit (SFU); Peer-
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to-Peer mesh (P2P), etc; events shared in the group room; events shared 1:1;
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possibly even out-of-band signalling).
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This is a starting point for a naive MCU implementation which could provide one
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possible Matrix-wide solution in future, which retains backwards compatibility
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with standard 1:1 calling.
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* A client chooses to initiate a conference for a given room by starting a
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voice or video call with a 'conference focus' user. This is a virtual user
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(typically Application Service) which implements a conferencing bridge. It
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isn't defined how the client discovers or selects this user.
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* The conference focus user MUST join the room in which the client has
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initiated the conference - this may require the client to invite the
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conference focus user to the room, depending on the room's `join_rules`. The
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conference focus user needs to be in the room to let the bridge eject users
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from the conference who have left the room in which it was initiated, and aid
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discovery of the conference by other users in the room. The bridge
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identifies the room to join based on the user ID by which it was invited.
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The format of this identifier is implementation dependent for now.
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* If a client leaves the group chat room, they MUST be ejected from the
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conference. If a client leaves the 1:1 room with the conference focus user,
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they SHOULD be ejected from the conference.
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* For now, rooms can contain multiple conference focus users - it's left to
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user or client implementation to select which to converge on. In future this
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could be mediated using a state event (e.g. `im.vector.call.mcu`), but we
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can't do that right now as by default normal users can't set arbitrary state
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events on a room.
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* To participate in the conference, other clients initiates a standard 1:1
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voice or video call to the conference focus user.
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* For best UX, clients SHOULD show the ongoing voice/video call in the UI
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context of the group room rather than 1:1 with the focus user. If a client
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recognises a conference user present in the room, it MAY chose to highlight
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this in the UI (e.g. with a "conference ongoing" notification, to aid
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discovery). Clients MAY hide the 1:1 room with the focus user (although in
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future this room could be used for floor control or other direct
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communication with the conference focus)
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* When all users have left the conference, the 'conference focus' user SHOULD
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leave the room.
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* If a conference focus user joins a room but does not receive a 1:1 voice or
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video call, it SHOULD time out after a period of time and leave the room.
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