MSC4196: MatrixRTC voice and video conferencing application m.call

proposals/4196-matrixrtc-m-call.md

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+# MSC4196: MatrixRTC voice and video conferencing application `m.call`
+
+## Proposal
+
+We define a MatrixRTC application type of `m.call`.
+
+### `m.rtc.member` state event
+
+A valid `m.rtc.member` state event with application `m.call` has the following fields in addition to the fields defined in [MSC4143](https://github.com/matrix-org/matrix-spec-proposals/pull/4143):
+
+- `session` required object:
+  - `application` required string: `m.call`
+  - `call_id` required string: The call ID of the session. Use `""` for a room level call.
+  - `scope` required string: The scope of the call. One of: `m.room`. More scopes may be added in the future.
+
+For example:
+
+```json5
+// event type: "m.rtc.member"
+// MSC3757 formatted state key: "@user:matrix.domain_xyzABCDEF10123"
+{
+  // standard fields from MSC4143:
+  "member": {
+    "id": "xyzABCDEF10123",
+    "device_id": "DEVICEID",
+    "user_id": "@user:matrix.domain"
+  }
+  "focus_active": { ...focus_1 },
+  "foci_preferred": [
+    { ...focus_1 },
+  ],
+  "session": {
+    "application": "m.call",
+    // additional fields for m.call:
+    "call_id": "",
+    "scope": "m.room"
+  }
+}
+```
+
+### Ringing with the `m.rtc.notify` room event
+
+A valid `m.rtc.notify` event with application `m.call` has the following fields in addition to the fields defined in [MSC4075](https://github.com/matrix-org/matrix-spec-proposals/pull/4075):
+
+- `session` required object: the contents of the `session` from the `m.rtc.member` event.
+
+```json5
+// event type: "m.rtc.notify"
+{
+  "content": {
+    // standard fields from MSC4075:
+    "application": "m.call",
+    "m.mentions": {"user_ids": [], "room": true },
+    "notify_type": "notification",
+    "session": {
+      "application": "m.call",
+      // for application = "m.call":
+      "call_id": ""
+    }
+  }
+}
+```
+
+## Potential issues
+
+## Alternatives
+
+## Security considerations
+
+## Unstable prefix
+
+The `m.call` application type is already within unstable prefixed entries (e.g.
+`org.matrix.msc3401.call.member`) and as such doesn't need its own unstable prefix.
+
+## Dependencies
+
+This MSC builds on [MSC4143](https://github.com/matrix-org/matrix-spec-proposals/pull/4143) and [MSC4075](https://github.com/matrix-org/matrix-spec-proposals/pull/4075).