Vapi Realtime API (WebSocket Transport + Server URL Events)

asyncapi: 2.6.0
info:
  title: Vapi Realtime API (WebSocket Transport + Server URL Events)
  version: '1.0.0'
  description: |
    AsyncAPI description of Vapi's realtime surfaces:

    1. The WebSocket Transport (`wss://api.vapi.ai/{callId}/transport`) used to
       stream binary audio and JSON control messages to and from an active call.
    2. The Server URL webhook surface — the JSON events Vapi POSTs to a
       customer-controlled HTTPS endpoint over the lifetime of a call, plus
       request/response webhooks (assistant-request, tool-calls,
       transfer-destination-request, knowledge-base-request, voice-request,
       call.endpointing.request).

    All event types, payload fields, and wrapper shapes are drawn from the
    official Vapi documentation:

      - https://docs.vapi.ai/calls/websocket-transport
      - https://docs.vapi.ai/server-url
      - https://docs.vapi.ai/server-url/events

    The Server URL events are conceptually webhooks (HTTPS POST), not WebSocket
    frames, but they are modelled here as messages on logical channels so they
    can sit alongside the WebSocket transport in a single AsyncAPI document.
  contact:
    name: Vapi
    url: https://vapi.ai
  license:
    name: Proprietary
    url: https://vapi.ai/terms-of-service

defaultContentType: application/json

servers:
  websocket:
    url: api.vapi.ai
    protocol: wss
    description: |
      Per-call WebSocket transport. The full URL is returned by
      `POST /call` when the call is created with a WebSocket transport
      configuration, in the form `wss://api.vapi.ai/{callId}/transport`.
      Authentication for the call-creation REST request is via Bearer API key.
  server-url:
    url: '{serverUrl}'
    protocol: https
    description: |
      Customer-controlled HTTPS endpoint that Vapi POSTs server messages to
      (the "Server URL"). Configured per-assistant, per-phone-number, or
      org-wide. Request/response webhooks (assistant-request, tool-calls,
      transfer-destination-request, knowledge-base-request) require a JSON
      reply within Vapi's documented timeout (7.5 seconds end-to-end for
      assistant-request).
    variables:
      serverUrl:
        default: https://example.com/vapi
        description: The HTTPS URL configured as the Vapi Server URL.

channels:

  # ----------------------------------------------------------------------
  # WebSocket transport channel — wss://api.vapi.ai/{callId}/transport
  # ----------------------------------------------------------------------

  '/{callId}/transport':
    description: |
      Per-call WebSocket transport. Carries:
        - Binary audio frames in both directions (PCM s16le or G.711 mu-law,
          format set when the call is created).
        - JSON text frames for client-to-server control messages (`hangup`,
          `end-call`).
    parameters:
      callId:
        description: UUID of the Vapi call this transport belongs to.
        schema:
          type: string
          format: uuid
    bindings:
      ws:
        bindingVersion: '0.1.0'
    publish:
      summary: Frames the client sends to Vapi over the WebSocket transport.
      description: |
        The client publishes two kinds of frames:
          - Binary audio frames containing raw microphone audio in the
            format chosen at call creation (16-bit signed little-endian PCM
            at 16000 Hz, or 8-bit G.711 mu-law at 8000 Hz).
          - JSON text control messages — currently `hangup` and `end-call`.
      message:
        oneOf:
          - $ref: '#/components/messages/ClientAudioFrame'
          - $ref: '#/components/messages/ClientHangup'
          - $ref: '#/components/messages/ClientEndCall'
    subscribe:
      summary: Frames Vapi sends to the client over the WebSocket transport.
      description: |
        Vapi publishes assistant audio as binary frames in the same audio
        format configured for the call. JSON text frames carrying server
        events on the WebSocket transport are not enumerated by the
        WebSocket Transport docs; see the `server-url/*` channels for the
        documented JSON server events delivered over the Server URL.
      message:
        $ref: '#/components/messages/ServerAudioFrame'

  # ----------------------------------------------------------------------
  # Server URL webhook channels — one per documented server message type
  # ----------------------------------------------------------------------

  server-url/assistant-request:
    description: |
      Vapi requests dynamic assistant configuration for an inbound call.
      Customer endpoint must respond within 7.5 seconds end-to-end with
      `{ assistantId }`, `{ assistant }`, `{ destination }`, or `{ error }`.
    subscribe:
      message:
        $ref: '#/components/messages/AssistantRequest'
    publish:
      message:
        $ref: '#/components/messages/AssistantRequestResponse'

  server-url/tool-calls:
    description: |
      Function/tool invocation triggered by the assistant. Customer endpoint
      replies with a `results` array correlating each `toolCallId` to a
      result string.
    subscribe:
      message:
        $ref: '#/components/messages/ToolCalls'
    publish:
      message:
        $ref: '#/components/messages/ToolCallsResponse'

  server-url/transfer-destination-request:
    description: |
      Vapi asks for a transfer destination when the assistant did not
      pre-specify one. Customer endpoint replies with a `destination` and
      optional spoken `message`.
    subscribe:
      message:
        $ref: '#/components/messages/TransferDestinationRequest'
    publish:
      message:
        $ref: '#/components/messages/TransferDestinationRequestResponse'

  server-url/knowledge-base-request:
    description: |
      Vapi asks a custom knowledge base provider for relevant documents.
      Customer endpoint replies with a `documents` array.
    subscribe:
      message:
        $ref: '#/components/messages/KnowledgeBaseRequest'
    publish:
      message:
        $ref: '#/components/messages/KnowledgeBaseRequestResponse'

  server-url/status-update:
    description: Call state changes — scheduled, queued, ringing, in-progress, forwarding, ended.
    subscribe:
      message:
        $ref: '#/components/messages/StatusUpdate'

  server-url/end-of-call-report:
    description: Final summary delivered after the call ends, with recording, transcript, and messages.
    subscribe:
      message:
        $ref: '#/components/messages/EndOfCallReport'

  server-url/hang:
    description: The assistant has failed to reply within the hang threshold.
    subscribe:
      message:
        $ref: '#/components/messages/Hang'

  server-url/conversation-update:
    description: Emitted when the conversation history is committed.
    subscribe:
      message:
        $ref: '#/components/messages/ConversationUpdate'

  server-url/transcript:
    description: |
      Streaming partial and final transcripts from the configured
      transcriber. Filtered by `transcriptType` (`partial` or `final`).
    subscribe:
      message:
        $ref: '#/components/messages/Transcript'

  server-url/speech-update:
    description: Speech-status change (started/stopped) for assistant or user.
    subscribe:
      message:
        $ref: '#/components/messages/SpeechUpdate'

  server-url/assistant-speech-started:
    description: |
      Real-time word-level timing for assistant speech, opt-in via
      `serverMessages`. Variants: ElevenLabs word-alignment, Minimax
      word-progress, or text-only (other providers).
    subscribe:
      message:
        $ref: '#/components/messages/AssistantSpeechStarted'

  server-url/model-output:
    description: Streamed LLM tokens or tool-call outputs, correlated by `turnId`.
    subscribe:
      message:
        $ref: '#/components/messages/ModelOutput'

  server-url/user-interrupted:
    description: User interrupted the assistant — use `turnId` to discard the interrupted turn's tokens.
    subscribe:
      message:
        $ref: '#/components/messages/UserInterrupted'

  server-url/transfer-update:
    description: Confirmation that a transfer executed, with the final destination.
    subscribe:
      message:
        $ref: '#/components/messages/TransferUpdate'

  server-url/language-change-detected:
    description: Transcriber switched its detected language.
    subscribe:
      message:
        $ref: '#/components/messages/LanguageChangeDetected'

  server-url/phone-call-control:
    description: |
      Delegate hangup or forwarding to the customer server. Opt-in via
      `serverMessages`. `request` is either `forward` (with `destination`)
      or `hang-up`.
    subscribe:
      message:
        $ref: '#/components/messages/PhoneCallControl'

  server-url/voice-input:
    description: Custom voice provider receives the user's transcribed input.
    subscribe:
      message:
        $ref: '#/components/messages/VoiceInput'

  server-url/voice-request:
    description: |
      TTS audio request sent to a custom voice server configured via
      `assistant.voice.server.url`. The customer endpoint must respond with
      raw 1-channel 16-bit PCM audio at the requested `sampleRate` (binary,
      not JSON).
    subscribe:
      message:
        $ref: '#/components/messages/VoiceRequest'

  server-url/call-endpointing-request:
    description: |
      Smart endpointing decision delegated to a customer server configured
      via `assistant.startSpeakingPlan.smartEndpointingPlan.server.url`.
      Customer endpoint responds with `{ timeoutSeconds }`.
    subscribe:
      message:
        $ref: '#/components/messages/CallEndpointingRequest'
    publish:
      message:
        $ref: '#/components/messages/CallEndpointingRequestResponse'

  server-url/chat-created:
    description: A new chat was created.
    subscribe:
      message:
        $ref: '#/components/messages/ChatCreated'

  server-url/chat-deleted:
    description: A chat was deleted.
    subscribe:
      message:
        $ref: '#/components/messages/ChatDeleted'

  server-url/session-created:
    description: A new session was created.
    subscribe:
      message:
        $ref: '#/components/messages/SessionCreated'

  server-url/session-updated:
    description: A session was updated.
    subscribe:
      message:
        $ref: '#/components/messages/SessionUpdated'

  server-url/session-deleted:
    description: A session was deleted.
    subscribe:
      message:
        $ref: '#/components/messages/SessionDeleted'

components:

  messages:

    # --- WebSocket transport messages ---

    ClientAudioFrame:
      name: ClientAudioFrame
      title: Client Audio Frame (Binary)
      summary: Raw microphone audio chunk in the call's configured format.
      contentType: application/octet-stream
      payload:
        type: string
        format: binary
        description: |
          Raw audio bytes. Format is set when the call is created: either
          16-bit signed little-endian PCM at 16000 Hz (`pcm_s16le`), or
          8-bit G.711 mu-law at 8000 Hz (`mulaw`).

    ServerAudioFrame:
      name: ServerAudioFrame
      title: Server Audio Frame (Binary)
      summary: Raw assistant audio chunk in the call's configured format.
      contentType: application/octet-stream
      payload:
        type: string
        format: binary
        description: |
          Raw audio bytes from the assistant, in the same format configured
          for the call (`pcm_s16le` or `mulaw`).

    ClientHangup:
      name: ClientHangup
      title: Hangup Control Message
      summary: Terminate the call.
      payload:
        $ref: '#/components/schemas/HangupControlMessage'

    ClientEndCall:
      name: ClientEndCall
      title: End-Call Control Message
      summary: End the WebSocket call.
      payload:
        $ref: '#/components/schemas/EndCallControlMessage'

    # --- Server URL request/response webhook messages ---

    AssistantRequest:
      name: AssistantRequest
      title: assistant-request
      payload:
        $ref: '#/components/schemas/AssistantRequestPayload'

    AssistantRequestResponse:
      name: AssistantRequestResponse
      title: assistant-request response
      payload:
        $ref: '#/components/schemas/AssistantRequestResponsePayload'

    ToolCalls:
      name: ToolCalls
      title: tool-calls
      payload:
        $ref: '#/components/schemas/ToolCallsPayload'

    ToolCallsResponse:
      name: ToolCallsResponse
      title: tool-calls response
      payload:
        $ref: '#/components/schemas/ToolCallsResponsePayload'

    TransferDestinationRequest:
      name: TransferDestinationRequest
      title: transfer-destination-request
      payload:
        $ref: '#/components/schemas/TransferDestinationRequestPayload'

    TransferDestinationRequestResponse:
      name: TransferDestinationRequestResponse
      title: transfer-destination-request response
      payload:
        $ref: '#/components/schemas/TransferDestinationRequestResponsePayload'

    KnowledgeBaseRequest:
      name: KnowledgeBaseRequest
      title: knowledge-base-request
      payload:
        $ref: '#/components/schemas/KnowledgeBaseRequestPayload'

    KnowledgeBaseRequestResponse:
      name: KnowledgeBaseRequestResponse
      title: knowledge-base-request response
      payload:
        $ref: '#/components/schemas/KnowledgeBaseRequestResponsePayload'

    # --- Server URL informational webhook messages ---

    StatusUpdate:
      name: StatusUpdate
      title: status-update
      payload:
        $ref: '#/components/schemas/StatusUpdatePayload'

    EndOfCallReport:
      name: EndOfCallReport
      title: end-of-call-report
      payload:
        $ref: '#/components/schemas/EndOfCallReportPayload'

    Hang:
      name: Hang
      title: hang
      payload:
        $ref: '#/components/schemas/HangPayload'

    ConversationUpdate:
      name: ConversationUpdate
      title: conversation-update
      payload:
        $ref: '#/components/schemas/ConversationUpdatePayload'

    Transcript:
      name: Transcript
      title: transcript
      payload:
        $ref: '#/components/schemas/TranscriptPayload'

    SpeechUpdate:
      name: SpeechUpdate
      title: speech-update
      payload:
        $ref: '#/components/schemas/SpeechUpdatePayload'

    AssistantSpeechStarted:
      name: AssistantSpeechStarted
      title: assistant.speechStarted
      payload:
        $ref: '#/components/schemas/AssistantSpeechStartedPayload'

    ModelOutput:
      name: ModelOutput
      title: model-output
      payload:
        $ref: '#/components/schemas/ModelOutputPayload'

    UserInterrupted:
      name: UserInterrupted
      title: user-interrupted
      payload:
        $ref: '#/components/schemas/UserInterruptedPayload'

    TransferUpdate:
      name: TransferUpdate
      title: transfer-update
      payload:
        $ref: '#/components/schemas/TransferUpdatePayload'

    LanguageChangeDetected:
      name: LanguageChangeDetected
      title: language-change-detected
      payload:
        $ref: '#/components/schemas/LanguageChangeDetectedPayload'

    PhoneCallControl:
      name: PhoneCallControl
      title: phone-call-control
      payload:
        $ref: '#/components/schemas/PhoneCallControlPayload'

    VoiceInput:
      name: VoiceInput
      title: voice-input
      payload:
        $ref: '#/components/schemas/VoiceInputPayload'

    VoiceRequest:
      name: VoiceRequest
      title: voice-request
      payload:
        $ref: '#/components/schemas/VoiceRequestPayload'

    CallEndpointingRequest:
      name: CallEndpointingRequest
      title: call.endpointing.request
      payload:
        $ref: '#/components/schemas/CallEndpointingRequestPayload'

    CallEndpointingRequestResponse:
      name: CallEndpointingRequestResponse
      title: call.endpointing.request response
      payload:
        $ref: '#/components/schemas/CallEndpointingRequestResponsePayload'

    ChatCreated:
      name: ChatCreated
      title: chat.created
      payload:
        $ref: '#/components/schemas/ChatCreatedPayload'

    ChatDeleted:
      name: ChatDeleted
      title: chat.deleted
      payload:
        $ref: '#/components/schemas/ChatDeletedPayload'

    SessionCreated:
      name: SessionCreated
      title: session.created
      payload:
        $ref: '#/components/schemas/SessionCreatedPayload'

    SessionUpdated:
      name: SessionUpdated
      title: session.updated
      payload:
        $ref: '#/components/schemas/SessionUpdatedPayload'

    SessionDeleted:
      name: SessionDeleted
      title: session.deleted
      payload:
        $ref: '#/components/schemas/SessionDeletedPayload'

  schemas:

    # --- Shared ---

    CallObject:
      type: object
      description: |
        The Vapi Call object. See the Vapi Calls API OpenAPI for the full
        schema; included here as an open object so this AsyncAPI document
        stays self-contained.
      additionalProperties: true

    ServerMessageEnvelope:
      type: object
      description: |
        Wrapper shape used by every Vapi Server URL event — the actual
        event payload lives inside the `message` property.
      required: [message]
      properties:
        message:
          type: object

    # --- WebSocket control messages ---

    HangupControlMessage:
      type: object
      required: [type]
      properties:
        type:
          type: string
          enum: [hangup]
      example:
        type: hangup

    EndCallControlMessage:
      type: object
      required: [type]
      properties:
        type:
          type: string
          enum: [end-call]
      example:
        type: end-call

    # --- assistant-request ---

    AssistantRequestPayload:
      allOf:
        - $ref: '#/components/schemas/ServerMessageEnvelope'
        - type: object
          properties:
            message:
              type: object
              required: [type, call]
              properties:
                type:
                  type: string
                  enum: [assistant-request]
                call:
                  $ref: '#/components/schemas/CallObject'

    AssistantRequestResponsePayload:
      description: |
        One of four response shapes. Customer endpoint must respond within
        7.5 seconds end-to-end.
      oneOf:
        - type: object
          required: [assistantId]
          properties:
            assistantId:
              type: string
              description: ID of an existing assistant.
        - type: object
          required: [assistant]
          properties:
            assistant:
              type: object
              description: Transient assistant configuration.
              additionalProperties: true
        - type: object
          required: [destination]
          properties:
            destination:
              type: object
              description: Direct transfer destination (bypasses the AI).
              additionalProperties: true
        - type: object
          required: [error]
          properties:
            error:
              type: string
              description: Error message to speak to the caller.

    # --- tool-calls ---

    ToolCallsPayload:
      allOf:
        - $ref: '#/components/schemas/ServerMessageEnvelope'
        - type: object
          properties:
            message:
              type: object
              required: [type, call]
              properties:
                type:
                  type: string
                  enum: [tool-calls]
                call:
                  $ref: '#/components/schemas/CallObject'
                toolWithToolCallList:
                  type: array
                  items:
                    type: object
                    additionalProperties: true
                toolCallList:
                  type: array
                  items:
                    type: object
                    required: [name, id]
                    properties:
                      name:
                        type: string
                      id:
                        type: string
                      parameters:
                        type: object
                        additionalProperties: true

    ToolCallsResponsePayload:
      type: object
      required: [results]
      properties:
        results:
          type: array
          items:
            type: object
            required: [name, toolCallId, result]
            properties:
              name:
                type: string
              toolCallId:
                type: string
              result:
                type: string

    # --- transfer-destination-request ---

    TransferDestinationRequestPayload:
      allOf:
        - $ref: '#/components/schemas/ServerMessageEnvelope'
        - type: object
          properties:
            message:
              type: object
              required: [type, call]
              properties:
                type:
                  type: string
                  enum: [transfer-destination-request]
                call:
                  $ref: '#/components/schemas/CallObject'

    TransferDestinationRequestResponsePayload:
      type: object
      required: [destination]
      properties:
        destination:
          type: object
          required: [type]
          properties:
            type:
              type: string
              enum: [number, assistant, sip]
            number:
              type: string
          additionalProperties: true
        message:
          type: object
          additionalProperties: true

    # --- knowledge-base-request ---

    KnowledgeBaseRequestPayload:
      allOf:
        - $ref: '#/components/schemas/ServerMessageEnvelope'
        - type: object
          properties:
            message:
              type: object
              required: [type]
              properties:
                type:
                  type: string
                  enum: [knowledge-base-request]
                messages:
                  type: array
                  items:
                    type: object
                    additionalProperties: true
                messagesOpenAIFormatted:
                  type: array
                  items:
                    type: object
                    additionalProperties: true

    KnowledgeBaseRequestResponsePayload:
      type: object
      required: [documents]
      properties:
        documents:
          type: array
          items:
            type: object
            required: [content]
            properties:
              content:
                type: string
              similarity:
                type: number
              uuid:
                type: string

    # --- status-update ---

    StatusUpdatePayload:
      allOf:
        - $ref: '#/components/schemas/ServerMessageEnvelope'
        - type: object
          properties:
            message:
              type: object
              required: [type, call, status]
              properties:
                type:
                  type: string
                  enum: [status-update]
                call:
                  $ref: '#/components/schemas/CallObject'
                status:
                  type: string
                  enum:
                    - scheduled
                    - queued
                    - ringing
                    - in-progress
                    - forwarding
                    - ended

    # --- end-of-call-report ---

    EndOfCallReportPayload:
      allOf:
        - $ref: '#/components/schemas/ServerMessageEnvelope'
        - type: object
          properties:
            message:
              type: object
              required: [type, call, endedReason, artifact]
              properties:
                type:
                  type: string
                  enum: [end-of-call-report]
                endedReason:
                  type: string
                call:
                  $ref: '#/components/schemas/CallObject'
                artifact:
                  type: object
                  properties:
                    recording:
                      type: object
                      additionalProperties: true
                    transcript:
                      type: string
                    messages:
                      type: array
                      items:
                        type: object
                        additionalProperties: true

    # --- hang ---

    HangPayload:
      allOf:
        - $ref: '#/components/schemas/ServerMessageEnvelope'
        - type: object
          properties:
            message:
              type: object
              required: [type, call]
              properties:
                type:
                  type: string
                  enum: [hang]
                call:
                  $ref: '#/components/schemas/CallObject'

    # --- conversation-update ---

    ConversationUpdatePayload:
      allOf:
        - $ref: '#/components/schemas/ServerMessageEnvelope'
        - type: object
          properties:
            message:
              type: object
              required: [type]
              properties:
                type:
                  type: string
                  enum: [conversation-update]
                messages:
                  type: array
                  items:
                    type: object
                    additionalProperties: true
                messagesOpenAIFormatted:
                  type: array
                  items:
                    type: object
                    additionalProperties: true

    # --- transcript ---

    TranscriptPayload:
      allOf:
        - $ref: '#/components/schemas/ServerMessageEnvelope'
        - type: object
          properties:
            message:
              type: object
              required: [type, role, transcriptType, transcript]
              properties:
                type:
                  type: string
                  enum: [transcript]
                role:
                  type: string
                  enum: [user, assistant]
                transcriptType:
                  type: string
                  enum: [partial, final]
                transcript:
                  type: string
                isFiltered:
                  type: boolean
                detectedThreats:
                  type: array
                  items:
                    type: string
                originalTranscript:
                  type: string

    # --- speech-update ---

    SpeechUpdatePayload:
      allOf:
        - $ref: '#/components/schemas/ServerMessageEnvelope'
        - type: object
          properties:
            message:
              type: object
              required: [type, status, role]
              properties:
                type:
                  type: string
                  enum: [speech-update]
                status:
                  type: string
                  enum: [started, stopped]
                role:
                  type: string
                  enum: [assistant, user]
                turn:
                  type: integer

    # --- assistant.speechStarted ---

    AssistantSpeechStartedPayload:
      allOf:
        - $ref: '#/components/schemas/ServerMessageEnvelope'
        - type: object
          properties:
            message:
              type: object
              required: [type, text]
              properties:
                type:
                  type: string
                  enum: [assistant.speechStarted]
                text:
                  type: string
                turn:
                  type: integer
                source:
                  type: string
                  enum: [model, force-say, custom-voice]
                timing:
                  description: |
                    Provider-dependent timing payload — `word-alignment`
                    (ElevenLabs), `word-progress` (Minimax), or omitted for
                    text-only providers.
                  oneOf:
                    - type: object
                      required: [type, words]
                      properties:
                        type:
                          type: string
                          enum: [word-alignment]
                        words:
                          type: array
                          items:
                            type: string
                        wordsStartTimesMs:
                          type: array
                          items:
                            type: number
                        wordsEndTimesMs:
                          type: array
                          items:
                            type: number
                    - type: object
                      required: [type]
                      properties:
                        type:
                          type: string
                          enum: [word-progress]
                        wordsSpoken:
                          type: integer
                        totalWords:
                          type: integer
                        segment:
                          type: string
                        words:
                          type: array
                          items:
                            type: string

    # --- model-output ---

    ModelOutputPayload:
      allOf:
        - $ref: '#/components/schemas/ServerMessageEnvelope'
        - type: object
          properties:
            message:
              type: object
              required: [type, output]
              properties:
                type:
                  type: string
                  enum: [model-output]
                output:
                  description: A streamed token or a tool-call output.
                  oneOf:
                    - type: string
                    - type: object
                      additionalProperties: true
                turnId:
                  type: string

    # --- user-interrupted ---

    UserInterruptedPayload:
      allOf:
        - $ref: '#/components/schemas/ServerMessageEnvelope'
        - type: object
          properties:
            message:
              type: object
              required: [type]
              properties:
                type:
                  type: string
                  enum: [user-interrupted]
                turnId:
                  type: string

    # --- transfer-update ---

    TransferUpdatePayload:
      allOf:
        - $ref: '#/components/schemas/ServerMessageEnvelope'
        - type: object
          properties:
            message:
              type: object
              required: [type, destination]
              properties:
                type:
                  type: string
                  enum: [transfer-update]
                destination:
                  type: object
                  required: [type]
                  properties:
                    type:
                      type: string
                      enum: [assistant, number, sip]
                  additionalProperties: true

    # --- language-change-detected ---

    LanguageChangeDetectedPayload:
      allOf:
        - $ref: '#/components/schemas/ServerMessageEnvelope'
        - type: object
          properties:
            message:
              type: object
              required: [type, language]
              properties:
                type:
                  type: string
                  enum: [language-change-detected]
                language:
                  type: string

    # --- phone-call-control ---

    PhoneCallControlPayload:
      allOf:
        - $ref: '#/components/schemas/ServerMessageEnvelope'
        - type: object
          properties:
            message:
              type: object
              required: [type, request]
              properties:
                type:
                  type: string
                  enum: [phone-call-control]
                request:
                  type: string
                  enum: [forward, hang-up]
                destination:
                  type: object
                  additionalProperties: true

    # --- voice-input ---

    VoiceInputPayload:
      allOf:
        - $ref: '#/components/schemas/ServerMessageEnvelope'
        - type: object
          properties:
            message:
              type: object
              required: [type, input]
              properties:
                type:
                  type: string
                  enum: [voice-input]
                input:
                  type: string

    # --- voice-request ---

    VoiceRequestPayload:
  

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# Full source: https://raw.githubusercontent.com/api-evangelist/vapi-ai/refs/heads/main/asyncapi/vapi-asyncapi.yml