Ultravox Realtime API

openapi: 3.0.3
info:
  title: Ultravox
  version: 0.1.0
  description: API for the Ultravox service.
paths:
  /api/accounts:
    get:
      operationId: accounts_list
      tags:
      - accounts
      security:
      - apiKeyAuth: []
      responses:
        '200':
          content:
            application/json:
              schema:
                type: array
                items:
                  $ref: '#/components/schemas/Account'
          description: ''
  /api/accounts/me:
    get:
      operationId: accounts_me_retrieve
      tags:
      - accounts
      security:
      - apiKeyAuth: []
      responses:
        '200':
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Account'
          description: ''
  /api/accounts/me/billing:
    get:
      operationId: accounts_me_billing_retrieve
      description: Gets high-level billing information for the current account.
      tags:
      - accounts
      security:
      - apiKeyAuth: []
      responses:
        '200':
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/AccountBillingInfo'
          description: ''
  /api/accounts/me/billing/invoices:
    get:
      operationId: accounts_me_billing_invoices_retrieve
      description: Lists invoices for the current account.
      parameters:
      - in: query
        name: cursor
        schema:
          type: string
          minLength: 1
        description: The pagination cursor value.
      - in: query
        name: pageSize
        schema:
          type: integer
          maximum: 100
          minimum: 1
          default: 10
        description: Number of results to return per page.
      tags:
      - accounts
      security:
      - apiKeyAuth: []
      responses:
        '200':
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/PaginatedInvoiceList'
          description: ''
  /api/accounts/me/billing/usage:
    get:
      operationId: accounts_me_billing_usage_retrieve
      description: Gets usage information for the current account in the given period.
      parameters:
      - in: query
        name: fromDate
        schema:
          type: string
          format: date
        description: Start date (UTC, inclusive) for per-day usage information. Defaults
          to the start of monthly billing cycle.
      - in: query
        name: toDate
        schema:
          type: string
          format: date
        description: End date (UTC, exclusive) for per-day usage information. Max
          90 days after fromDate.
      tags:
      - accounts
      security:
      - apiKeyAuth: []
      responses:
        '200':
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/UsageResponse'
          description: ''
  /api/accounts/me/telephony_config:
    get:
      operationId: accounts_me_telephony_config_retrieve
      description: DEPRECATED. Prefer the provider-specific endpoints, e.g. /api/telephony_configs/twilio.
      tags:
      - accounts
      security:
      - apiKeyAuth: []
      deprecated: true
      responses:
        '200':
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/AccountTelephonyConfig'
          description: ''
    patch:
      operationId: accounts_me_telephony_config_partial_update
      description: DEPRECATED. Prefer the provider-specific endpoints, e.g. /api/telephony_configs/twilio.
      tags:
      - accounts
      requestBody:
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/PatchedAccountTelephonyConfig'
      security:
      - apiKeyAuth: []
      deprecated: true
      responses:
        '200':
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/AccountTelephonyConfig'
          description: ''
  /api/accounts/me/tts_api_keys:
    get:
      operationId: accounts_me_tts_api_keys_retrieve
      tags:
      - accounts
      security:
      - apiKeyAuth: []
      responses:
        '200':
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/AccountTtsKeys'
          description: ''
    patch:
      operationId: accounts_me_tts_api_keys_partial_update
      tags:
      - accounts
      requestBody:
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/PatchedSetTtsApiKeysRequest'
      security:
      - apiKeyAuth: []
      responses:
        '200':
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/AccountTtsKeys'
          description: ''
  /api/accounts/me/usage/calls:
    get:
      operationId: accounts_me_usage_calls_retrieve
      description: Gets aggregated call usage.
      parameters:
      - in: query
        name: agentIds
        schema:
          type: array
          items:
            type: string
            format: uuid
        description: Filter calls by the agent IDs.
      - in: query
        name: durationMax
        schema:
          type: string
        description: Maximum duration of calls
      - in: query
        name: durationMin
        schema:
          type: string
        description: Minimum duration of calls
      - in: query
        name: fromDate
        schema:
          type: string
          format: date-time
        description: Start datetime (inclusive) for filtering calls by creation date.
          If no time component is present, this defaults to the start of the day (midnight).
      - in: query
        name: metadata
        schema:
          type: object
          additionalProperties:
            type: string
        description: Filter calls by metadata. Use metadata.key=value to filter by
          specific key-value pairs.
      - in: query
        name: search
        schema:
          type: string
          minLength: 1
        description: The search string used to filter results
      - in: query
        name: timeOfDayEnd
        schema:
          type: string
          format: time
          default: '23:59:59.999999'
        description: 'Filter calls by the time of day of their creation, regardless
          of date. Format: HH:MM:SS. Defaults to 23:59:59 if not specified.'
      - in: query
        name: timeOfDayStart
        schema:
          type: string
          format: time
          default: 00:00:00
        description: 'Filter calls by the time of day of their creation, regardless
          of date. Format: HH:MM:SS. Defaults to 00:00:00 if not specified.'
      - in: query
        name: toDate
        schema:
          type: string
          format: date-time
        description: End datetime (inclusive) for filtering calls by creation date.
          If no time component is present, this defaults to the end of the day (11:59:59.999999
          PM).
      - in: query
        name: voiceId
        schema:
          type: string
          format: uuid
        description: Filter calls by the associated voice ID
      tags:
      - accounts
      security:
      - apiKeyAuth: []
      responses:
        '200':
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/CallUsage'
          description: ''
  /api/accounts/me/usage/concurrency:
    get:
      operationId: accounts_me_usage_concurrency_retrieve
      description: Gets historical call concurrency for the account.
      parameters:
      - in: query
        name: bucket
        schema:
          enum:
          - minute
          - 5min
          - hour
          - day
          type: string
          default: minute
          minLength: 1
        description: |-
          Bucket size for the time series.

          * `minute` - minute
          * `5min` - 5min
          * `hour` - hour
          * `day` - day
      - in: query
        name: end
        schema:
          type: string
          format: date-time
        description: End datetime for the time range. Defaults to now.
      - in: query
        name: start
        schema:
          type: string
          format: date-time
        description: Start datetime for the time range. Defaults to 24 hours before
          end.
      tags:
      - accounts
      security:
      - apiKeyAuth: []
      responses:
        '200':
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ConcurrencyResponse'
          description: ''
  /api/agents:
    get:
      operationId: agents_list
      parameters:
      - name: cursor
        required: false
        in: query
        description: The pagination cursor value.
        schema:
          type: string
      - name: pageSize
        required: false
        in: query
        description: Number of results to return per page.
        schema:
          type: integer
      - in: query
        name: search
        schema:
          type: string
          minLength: 1
        description: The search string used to filter results
      - name: sort
        required: false
        in: query
        description: Which field to use when ordering the results.
        schema:
          type: string
      tags:
      - agents
      security:
      - apiKeyAuth: []
      responses:
        '200':
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/PaginatedAgentList'
          description: ''
    post:
      operationId: agents_create
      tags:
      - agents
      requestBody:
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/Agent'
      security:
      - apiKeyAuth: []
      responses:
        '201':
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Agent'
          description: ''
  /api/agents/{agent_id}:
    get:
      operationId: agents_retrieve
      parameters:
      - in: path
        name: agent_id
        schema:
          type: string
          format: uuid
        required: true
      tags:
      - agents
      security:
      - apiKeyAuth: []
      responses:
        '200':
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Agent'
          description: ''
    patch:
      operationId: agents_partial_update
      parameters:
      - in: path
        name: agent_id
        schema:
          type: string
          format: uuid
        required: true
      tags:
      - agents
      requestBody:
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/PatchedAgent'
      security:
      - apiKeyAuth: []
      responses:
        '200':
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Agent'
          description: ''
    delete:
      operationId: agents_destroy
      parameters:
      - in: path
        name: agent_id
        schema:
          type: string
          format: uuid
        required: true
      tags:
      - agents
      security:
      - apiKeyAuth: []
      responses:
        '204':
          description: No response body
  /api/agents/{agent_id}/calls:
    get:
      operationId: agents_calls_list
      parameters:
      - in: path
        name: agent_id
        schema:
          type: string
          format: uuid
        required: true
      - name: cursor
        required: false
        in: query
        description: The pagination cursor value.
        schema:
          type: string
      - name: pageSize
        required: false
        in: query
        description: Number of results to return per page.
        schema:
          type: integer
      tags:
      - agents
      security:
      - apiKeyAuth: []
      responses:
        '200':
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/PaginatedCallList'
          description: ''
    post:
      operationId: agents_calls_create
      parameters:
      - in: path
        name: agent_id
        schema:
          type: string
          format: uuid
        required: true
      - in: query
        name: throttle
        schema:
          type: string
          minLength: 1
        description: The name or ID of a call throttle to apply to this call. If the
          throttle's rate limits have been exceeded, the call will be rejected with
          a 429 status.
      tags:
      - agents
      requestBody:
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/ultravox.v1.StartAgentCallRequest'
      security:
      - apiKeyAuth: []
      responses:
        '201':
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Call'
          description: ''
  /api/agents/{agent_id}/scheduled_batches:
    get:
      operationId: agents_scheduled_batches_list
      parameters:
      - in: path
        name: agent_id
        schema:
          type: string
          format: uuid
        required: true
      - name: cursor
        required: false
        in: query
        description: The pagination cursor value.
        schema:
          type: string
      - name: pageSize
        required: false
        in: query
        description: Number of results to return per page.
        schema:
          type: integer
      tags:
      - agents
      security:
      - apiKeyAuth: []
      responses:
        '200':
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/PaginatedScheduledCallBatchList'
          description: ''
    post:
      operationId: agents_scheduled_batches_create
      parameters:
      - in: path
        name: agent_id
        schema:
          type: string
          format: uuid
        required: true
      tags:
      - agents
      requestBody:
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/ScheduledCallBatch'
        required: true
      security:
      - apiKeyAuth: []
      responses:
        '201':
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ScheduledCallBatch'
          description: ''
  /api/agents/{agent_id}/scheduled_batches/{batch_id}:
    get:
      operationId: agents_scheduled_batches_retrieve
      parameters:
      - in: path
        name: agent_id
        schema:
          type: string
          format: uuid
        required: true
      - in: path
        name: batch_id
        schema:
          type: string
          format: uuid
        required: true
      tags:
      - agents
      security:
      - apiKeyAuth: []
      responses:
        '200':
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ScheduledCallBatch'
          description: ''
    patch:
      operationId: agents_scheduled_batches_partial_update
      parameters:
      - in: path
        name: agent_id
        schema:
          type: string
          format: uuid
        required: true
      - in: path
        name: batch_id
        schema:
          type: string
          format: uuid
        required: true
      tags:
      - agents
      requestBody:
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/PatchedScheduledCallBatch'
      security:
      - apiKeyAuth: []
      responses:
        '200':
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ScheduledCallBatch'
          description: ''
    delete:
      operationId: agents_scheduled_batches_destroy
      parameters:
      - in: path
        name: agent_id
        schema:
          type: string
          format: uuid
        required: true
      - in: path
        name: batch_id
        schema:
          type: string
          format: uuid
        required: true
      tags:
      - agents
      security:
      - apiKeyAuth: []
      responses:
        '204':
          description: No response body
  /api/agents/{agent_id}/scheduled_batches/{batch_id}/created_calls:
    get:
      operationId: agents_scheduled_batches_created_calls_list
      parameters:
      - in: path
        name: agent_id
        schema:
          type: string
          format: uuid
        required: true
      - in: path
        name: batch_id
        schema:
          type: string
          format: uuid
        required: true
      - name: cursor
        required: false
        in: query
        description: The pagination cursor value.
        schema:
          type: string
      - name: pageSize
        required: false
        in: query
        description: Number of results to return per page.
        schema:
          type: integer
      tags:
      - agents
      security:
      - apiKeyAuth: []
      responses:
        '200':
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/PaginatedCallList'
          description: ''
  /api/agents/{agent_id}/scheduled_batches/{batch_id}/scheduled_calls:
    get:
      operationId: agents_scheduled_batches_scheduled_calls_list
      description: List scheduled calls within a batch.
      parameters:
      - in: path
        name: agent_id
        schema:
          type: string
          format: uuid
        required: true
      - in: path
        name: batch_id
        schema:
          type: string
          format: uuid
        required: true
      - name: cursor
        required: false
        in: query
        description: The pagination cursor value.
        schema:
          type: string
      - name: pageSize
        required: false
        in: query
        description: Number of results to return per page.
        schema:
          type: integer
      - in: query
        name: status
        schema:
          enum:
          - FUTURE
          - PENDING
          - SUCCESS
          - EXPIRED
          - ERROR
          type: string
          minLength: 1
        description: |-
          * `FUTURE` - FUTURE
          * `PENDING` - PENDING
          * `SUCCESS` - SUCCESS
          * `EXPIRED` - EXPIRED
          * `ERROR` - ERROR
      tags:
      - agents
      security:
      - apiKeyAuth: []
      responses:
        '200':
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/PaginatedScheduledCallList'
          description: ''
  /api/agents/{agent_id}/telephony_xml:
    post:
      operationId: agents_telephony_xml
      description: Allows supported telephony providers to create incoming calls with
        an agent, returning XML instructions for handling the call.
      parameters:
      - in: path
        name: agent_id
        schema:
          type: string
          format: uuid
        required: true
      tags:
      - agents
      requestBody:
        content:
          application/x-www-form-urlencoded:
            schema:
              description: Provider-defined request.
          application/json:
            schema:
              description: Provider-defined request.
      responses:
        '200':
          content:
            text/xml:
              schema:
                description: XML appropriate for the telephony provider.
          description: ''
  /api/agents/usage:
    get:
      operationId: agents_usage_list
      parameters:
      - in: query
        name: agentIds
        schema:
          type: array
          items:
            type: string
            format: uuid
        description: Filter calls by the agent IDs.
      - in: query
        name: durationMax
        schema:
          type: string
        description: Maximum duration of calls
      - in: query
        name: durationMin
        schema:
          type: string
        description: Minimum duration of calls
      - in: query
        name: fromDate
        schema:
          type: string
          format: date-time
        description: Start datetime (inclusive) for filtering calls by creation date.
          If no time component is present, this defaults to the start of the day (midnight).
      - in: query
        name: metadata
        schema:
          type: object
          additionalProperties:
            type: string
        description: Filter calls by metadata. Use metadata.key=value to filter by
          specific key-value pairs.
      - in: query
        name: search
        schema:
          type: string
          minLength: 1
        description: The search string used to filter results
      - in: query
        name: timeOfDayEnd
        schema:
          type: string
          format: time
          default: '23:59:59.999999'
        description: 'Filter calls by the time of day of their creation, regardless
          of date. Format: HH:MM:SS. Defaults to 23:59:59 if not specified.'
      - in: query
        name: timeOfDayStart
        schema:
          type: string
          format: time
          default: 00:00:00
        description: 'Filter calls by the time of day of their creation, regardless
          of date. Format: HH:MM:SS. Defaults to 00:00:00 if not specified.'
      - in: query
        name: toDate
        schema:
          type: string
          format: date-time
        description: End datetime (inclusive) for filtering calls by creation date.
          If no time component is present, this defaults to the end of the day (11:59:59.999999
          PM).
      - in: query
        name: voiceId
        schema:
          type: string
          format: uuid
        description: Filter calls by the associated voice ID
      tags:
      - agents
      security:
      - apiKeyAuth: []
      responses:
        '200':
          content:
            application/json:
              schema:
                type: array
                items:
                  $ref: '#/components/schemas/AgentUsage'
          description: ''
  /api/api_keys:
    get:
      operationId: api_keys_list
      description: Gets the current user's API keys.
      parameters:
      - name: cursor
        required: false
        in: query
        description: The pagination cursor value.
        schema:
          type: string
      - name: pageSize
        required: false
        in: query
        description: Number of results to return per page.
        schema:
          type: integer
      tags:
      - api_keys
      responses:
        '200':
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/PaginatedAPIKeyList'
          description: ''
    post:
      operationId: api_keys_create
      description: Creates a new API key.
      tags:
      - api_keys
      requestBody:
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/APIKeyCreate'
        required: true
      responses:
        '201':
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/APIKeyCreate'
          description: ''
  /api/api_keys/{api_key_prefix}:
    get:
      operationId: api_keys_retrieve
      description: Gets an API key.
      parameters:
      - in: path
        name: api_key_prefix
        schema:
          type: string
        required: true
      tags:
      - api_keys
      responses:
        '200':
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/APIKey'
          description: ''
    put:
      operationId: api_keys_update
      description: Updates an API key.
      parameters:
      - in: path
        name: api_key_prefix
        schema:
          type: string
        required: true
      tags:
      - api_keys
      requestBody:
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/APIKey'
      responses:
        '200':
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/APIKey'
          description: ''
    patch:
      operationId: api_keys_partial_update
      description: Updates an API key.
      parameters:
      - in: path
        name: api_key_prefix
        schema:
          type: string
        required: true
      tags:
      - api_keys
      requestBody:
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/PatchedAPIKey'
      responses:
        '200':
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/APIKey'
          description: ''
    delete:
      operationId: api_keys_destroy
      description: Deletes an API key.
      parameters:
      - in: path
        name: api_key_prefix
        schema:
          type: string
        required: true
      tags:
      - api_keys
      responses:
        '204':
          description: No response body
  /api/call_throttles:
    get:
      operationId: call_throttles_list
      description: Lists call throttles for the current account.
      parameters:
      - name: cursor
        required: false
        in: query
        description: The pagination cursor value.
        schema:
          type: string
      - name: pageSize
        required: false
        in: query
        description: Number of results to return per page.
        schema:
          type: integer
      tags:
      - call_throttles
      security:
      - apiKeyAuth: []
      responses:
        '200':
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/PaginatedCallThrottleList'
          description: ''
    post:
      operationId: call_throttles_create
      description: Creates a new call throttle.
      tags:
      - call_throttles
      requestBody:
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/CallThrottle'
        required: true
      security:
      - apiKeyAuth: []
      responses:
        '201':
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/CallThrottle'
          description: ''
  /api/call_throttles/{throttle_id}:
    get:
      operationId: call_throttles_retrieve
      description: Gets a call throttle.
      parameters:
      - in: path
        name: throttle_id
        schema:
          type: string
          format: uuid
        required: true
      tags:
      - call_throttles
      security:
      - apiKeyAuth: []
      responses:
        '200':
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/CallThrottle'
          description: ''
    put:
      operationId: call_throttles_update
      description: Updates a call throttle (full replacement).
      parameters:
      - in: path
        name: throttle_id
        schema:
          type: string
          format: uuid
        required: true
      tags:
      - call_throttles
      requestBody:
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/CallThrottle'
        required: true
      security:
      - apiKeyAuth: []
      responses:
        '200':
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/CallThrottle'
          description: ''
    patch:
      operationId: call_throttles_partial_update
      description: Partially updates a call throttle.
      parameters:
      - in: path
        name: throttle_id
        schema:
          type: string
          format: uuid
        required: true
      tags:
      - call_throttles
      requestBody:
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/PatchedCallThrottle'
      security:
      - apiKeyAuth: []
      responses:
        '200':
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/CallThrottle'
          description: ''
    delete:
      operationId: call_throttles_destroy
      description: Deletes a call throttle.
      parameters:
      - in: path
        name: throttle_id
        schema:
          type: string
          format: uuid
        required: true
      tags:
      - call_throttles
      security:
      - apiKeyAuth: []
      responses:
        '204':
          description: No response body
  /api/calls:
    get:
      operationId: calls_list
      parameters:
      - in: query
        name: agentIds
        schema:
          type: array
          items:
            type: string
            format: uuid
        description: Filter calls by the agent IDs.
      - name: cursor
        required: false
        in: query
        description: The pagination cursor value.
        schema:
          type: string
      - in: query
        name: durationMax
        schema:
          type: string
        description: Maximum duration of calls
      - in: query
        name: durationMin
        schema:
          type: string
        description: Minimum duration of calls
      - in: query
        name: fromDate
        schema:
          type: string
          format: date-time
        description: Start datetime (inclusive) for filtering calls by creation date.
          If no time component is present, this defaults to the start of the day (midnight).
      - in: query
        name: metadata
        schema:
          type: object
          additionalProperties:
            type: string
        description: Filter calls by metadata. Use metadata.key=value to filter by
          specific key-value pairs.
      - name: pageSize
        required: false
        in: query
        description: Number of results to return per page.
        schema:
          type: integer
      - in: query
        name: search
        schema:
          type: string
          minLength: 1
        description: The search string used to filter results
      - name: sort
        required: false
        in: query
        description: Which field to use when ordering the results.
        schema:
          type: string
      - in: query
        name: timeOfDayEnd
        schema:
          type: string
          format: time
          default: '23:59:59.999999'
        description: 'Filter calls by the time of day of their creation, regardless
          of date. Format: HH:MM:SS. Defaults to 23:59:59 if not specified.'
      - in: query
        name: timeOfDayStart
        schema:
          type: string
          format: time
          default: 00:00:00
        description: 'Filter calls by the time of day of their creation, regardless
          of date. Format: HH:MM:SS. Defaults to 00:00:00 if not specified.'
      - in: query
        name: toDate
        schema:
          type: string
          format: date-time
        description: End datetime (inclusive) for filtering calls by creation date.
          If no time component is present, this defaults to the end of the day (11:59:59.999999
          PM).
      - in: query
        name: voiceId
        schema:
          type: string
          format: uuid
        description: Filter calls by the associated voice ID
      tags:
      - calls
      security:
      - apiKeyAuth: []
      responses:
        '200':
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/PaginatedCallList'
          description: ''
    post:
      operationId: calls_create
      parameters:
      - in: query
        name: enableGreetingPrompt
        schema:
          type: boolean
          default: true
        description: Adds a prompt for a greeting if there's not an initial message
          that the model would naturally respond to (a user message or tool result).
      - in: query
        name: priorCallId
        schema:
          type: string
          format: uuid
        description: The UUID of a prior call. When specified, the new call will use
          the same properites as the prior call unless overriden in this request's
          body. The new call will also use the prior call's message history as its
          o

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# Full source: https://raw.githubusercontent.com/api-evangelist/fixie/refs/heads/main/openapi/fixie-ultravox-openapi-original.yml