$schema: https://json-schema.org/draft/2020-12/schema

type: object
description: This event is sent by the caller when they wish to establish a call.
x-weight: 10
allOf:
- $ref: core-event-schema/room_event.yaml
properties:
  content:
    type: object
    allOf:
    - $ref: core-event-schema/call_event.yaml
    properties:
      offer:
        type: object
        title: Offer
        description: The session description object
        properties:
          type:
            type: string
            enum:
            - offer
            description: The type of session description.
          sdp:
            type: string
            description: The SDP text of the session description.
        required:
        - type
        - sdp
      lifetime:
        type: integer
        description: The time in milliseconds that the invite is valid for. Once the invite age exceeds this value, clients should discard it. They should also no longer show the call as awaiting an answer in the UI.
      invitee:
        type: string
        description: The ID of the user being called. If omitted, any user in the room can answer.
        x-addedInMatrixVersion: '1.7'
        format: mx-user-id
        pattern: "^@"
      sdp_stream_metadata:
        $ref: components/sdp_stream_metadata.yaml
    required:
    - offer
    - lifetime
  type:
    type: string
    enum:
    - m.call.invite