{
  "type": "object",
  "properties": {
    "iceServers": {
      "type": "array",
      "maxItems": 8,
      "description": "Optional public STUN configuration passed to the browser's standard RTCIceServer interface. Omitted or empty means no ICE servers. Gathering starts only when a caller deliberately initiates a session. TURN and credentials are excluded.",
      "items": {
        "type": "object",
        "description": "The credential-free public STUN subset of the standard WebRTC RTCIceServer dictionary. URLs are discoverable configuration, never session credentials.",
        "required": [
          "urls"
        ],
        "properties": {
          "urls": {
            "oneOf": [
              {
                "type": "string",
                "description": "Public, credential-free STUN URI using the RFC 7064 stun:host[:port] form. This version supports DNS names and IPv4 hosts, with ports 1 through 65535. IPv6 literals, secure STUN, TURN, paths, queries and fragments are not supported by this configuration subset.",
                "minLength": 6,
                "maxLength": 256,
                "not": {
                  "pattern": "\\s"
                },
                "pattern": "^stun:[A-Za-z0-9](?:[A-Za-z0-9-]*[A-Za-z0-9])?(?:\\.[A-Za-z0-9](?:[A-Za-z0-9-]*[A-Za-z0-9])?)*(?::(?:[1-9][0-9]{0,3}|[1-5][0-9]{4}|6[0-4][0-9]{3}|65[0-4][0-9]{2}|655[0-2][0-9]|6553[0-5]))?$"
              },
              {
                "type": "array",
                "minItems": 1,
                "maxItems": 8,
                "items": {
                  "$ref": "#/properties/iceServers/items/properties/urls/oneOf/0"
                }
              }
            ]
          }
        },
        "additionalProperties": false,
        "title": "RtcIceServer"
      }
    },
    "supportedStreams": {
      "type": "array",
      "description": "Discoverable media streams in SDP offer order. Directions describe the endpoint; the browser reverses SENDONLY and RECVONLY. Omitted means a video SENDONLY stream.",
      "items": {
        "type": "object",
        "description": "A discoverable RTC media stream supported by an endpoint.",
        "additionalProperties": false,
        "required": [
          "id",
          "mediaKind",
          "direction"
        ],
        "properties": {
          "id": {
            "type": "string",
            "description": "Stable identifier for the stream within the endpoint contract."
          },
          "mediaKind": {
            "type": "string",
            "enum": [
              "AUDIO",
              "VIDEO"
            ]
          },
          "direction": {
            "type": "string",
            "description": "Direction from the endpoint perspective; browser SENDONLY and RECVONLY are reversed.",
            "enum": [
              "SENDRECV",
              "SENDONLY",
              "RECVONLY",
              "INACTIVE"
            ]
          },
          "codecs": {
            "type": "array",
            "minItems": 1,
            "maxItems": 16,
            "uniqueItems": true,
            "description": "Ordered permitted RTP codec MIME types, such as audio/opus or video/H264. Omitted uses browser defaults.",
            "items": {
              "type": "string",
              "pattern": "^(audio|video)/[A-Za-z0-9.+-]+$",
              "maxLength": 128
            }
          }
        },
        "title": "RtcSessionSupportedStream"
      }
    },
    "dataChannels": {
      "type": "array",
      "maxItems": 8,
      "description": "Data channels the browser creates after media transceivers, using the standard RTCDataChannelInit options. Omitted means no data channels.",
      "items": {
        "type": "object",
        "description": "Standard WebRTC RTCDataChannelInit options plus the required label passed to createDataChannel. Channels are bidirectional.",
        "additionalProperties": false,
        "required": [
          "label"
        ],
        "properties": {
          "label": {
            "type": "string",
            "maxLength": 256
          },
          "ordered": {
            "type": "boolean"
          },
          "protocol": {
            "type": "string",
            "maxLength": 256
          },
          "maxPacketLifeTime": {
            "type": "integer",
            "minimum": 0,
            "maximum": 65535
          },
          "maxRetransmits": {
            "type": "integer",
            "minimum": 0,
            "maximum": 65535
          },
          "negotiated": {
            "type": "boolean"
          },
          "id": {
            "type": "integer",
            "minimum": 0,
            "maximum": 65534
          }
        },
        "not": {
          "required": [
            "maxPacketLifeTime",
            "maxRetransmits"
          ]
        },
        "allOf": [
          {
            "if": {
              "properties": {
                "negotiated": {
                  "const": true
                }
              },
              "required": [
                "negotiated"
              ]
            },
            "then": {
              "required": [
                "id"
              ]
            }
          }
        ],
        "title": "RtcDataChannel"
      }
    },
    "iceMode": {
      "type": "string",
      "description": "Whether the endpoint expects a full offer up front or supports trickle ICE.",
      "enum": [
        "FULL_OFFER",
        "TRICKLE"
      ]
    },
    "messageAuthorizationRequirements": {
      "type": "array",
      "description": "Per-message authorization requirements for RTC session messages.",
      "items": {
        "type": "object",
        "description": "Authorization requirements for a specific RTC session message.",
        "additionalProperties": false,
        "required": [
          "messageName",
          "authorization"
        ],
        "properties": {
          "messageName": {
            "type": "string"
          },
          "authorization": {
            "type": "array",
            "items": {
              "type": "object",
              "description": "A typed authorization requirement for an RTC session message.",
              "additionalProperties": false,
              "required": [
                "type",
                "required"
              ],
              "properties": {
                "type": {
                  "type": "string"
                },
                "required": {
                  "type": "boolean"
                }
              },
              "title": "RtcSessionAuthorizationRequirement"
            }
          }
        },
        "title": "RtcSessionMessageAuthorizationRequirement"
      }
    }
  },
  "additionalProperties": false,
  "description": "RTC sessions initiate a connection using an offer and return an answer for the session. Follow disconnection events and close the session when the connection is no longer needed."
}