Vapi · Schema

ByoPhoneNumber

Artificial IntelligenceVoiceAgentsReal-TimeCPaaS

Properties

Name Type Description
fallbackDestination object This is the fallback destination an inbound call will be transferred to if: 1. `assistantId` is not set 2. `squadId` is not set 3. and, `assistant-request` message to the `serverUrl` fails If this is
hooks array This is the hooks that will be used for incoming calls to this phone number.
provider string This is to bring your own phone numbers from your own SIP trunks or Carriers.
numberE164CheckEnabled boolean This is the flag to toggle the E164 check for the `number` field. This is an advanced property which should be used if you know your use case requires it. Use cases: - `false`: To allow non-E164 numbe
id string This is the unique identifier for the phone number.
orgId string This is the unique identifier for the org that this phone number belongs to.
createdAt string This is the ISO 8601 date-time string of when the phone number was created.
updatedAt string This is the ISO 8601 date-time string of when the phone number was last updated.
status string This is the status of the phone number.
name string This is the name of the phone number. This is just for your own reference.
assistantId string This is the assistant that will be used for incoming calls to this phone number. If neither `assistantId`, `squadId` nor `workflowId` is set, `assistant-request` will be sent to your Server URL. Check
workflowId string This is the workflow that will be used for incoming calls to this phone number. If neither `assistantId`, `squadId`, nor `workflowId` is set, `assistant-request` will be sent to your Server URL. Check
squadId string This is the squad that will be used for incoming calls to this phone number. If neither `assistantId`, `squadId`, nor `workflowId` is set, `assistant-request` will be sent to your Server URL. Check `S
server object This is where Vapi will send webhooks. You can find all webhooks available along with their shape in ServerMessage schema. The order of precedence is: 1. assistant.server 2. phoneNumber.server 3. org.
number string This is the number of the customer.
credentialId string This is the credential of your own SIP trunk or Carrier (type `byo-sip-trunk`) which can be used to make calls to this phone number. You can add the SIP trunk or Carrier credential in the Provider Cre
View JSON Schema on GitHub

JSON Schema

vapi-byophonenumber-schema.json Raw ↑
{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "#/components/schemas/ByoPhoneNumber",
  "title": "ByoPhoneNumber",
  "type": "object",
  "properties": {
    "fallbackDestination": {
      "description": "This is the fallback destination an inbound call will be transferred to if:\n1. `assistantId` is not set\n2. `squadId` is not set\n3. and, `assistant-request` message to the `serverUrl` fails\n\nIf this is not set and above conditions are met, the inbound call is hung up with an error message.",
      "oneOf": [
        {
          "$ref": "#/components/schemas/TransferDestinationNumber",
          "title": "NumberTransferDestination"
        },
        {
          "$ref": "#/components/schemas/TransferDestinationSip",
          "title": "SipTransferDestination"
        }
      ]
    },
    "hooks": {
      "type": "array",
      "description": "This is the hooks that will be used for incoming calls to this phone number.",
      "items": {
        "oneOf": [
          {
            "$ref": "#/components/schemas/PhoneNumberHookCallRinging",
            "title": "PhoneNumberHookCallRinging"
          },
          {
            "$ref": "#/components/schemas/PhoneNumberHookCallEnding",
            "title": "PhoneNumberHookCallEnding"
          }
        ]
      }
    },
    "provider": {
      "type": "string",
      "description": "This is to bring your own phone numbers from your own SIP trunks or Carriers.",
      "enum": [
        "byo-phone-number"
      ]
    },
    "numberE164CheckEnabled": {
      "type": "boolean",
      "description": "This is the flag to toggle the E164 check for the `number` field. This is an advanced property which should be used if you know your use case requires it.\n\nUse cases:\n- `false`: To allow non-E164 numbers like `+001234567890`, `1234`, or `abc`. This is useful for dialing out to non-E164 numbers on your SIP trunks.\n- `true` (default): To allow only E164 numbers like `+14155551234`. This is standard for PSTN calls.\n\nIf `false`, the `number` is still required to only contain alphanumeric characters (regex: `/^\\+?[a-zA-Z0-9]+$/`).\n\n@default true (E164 check is enabled)",
      "default": true
    },
    "id": {
      "type": "string",
      "description": "This is the unique identifier for the phone number."
    },
    "orgId": {
      "type": "string",
      "description": "This is the unique identifier for the org that this phone number belongs to."
    },
    "createdAt": {
      "format": "date-time",
      "type": "string",
      "description": "This is the ISO 8601 date-time string of when the phone number was created."
    },
    "updatedAt": {
      "format": "date-time",
      "type": "string",
      "description": "This is the ISO 8601 date-time string of when the phone number was last updated."
    },
    "status": {
      "type": "string",
      "description": "This is the status of the phone number.",
      "enum": [
        "active",
        "activating",
        "blocked"
      ]
    },
    "name": {
      "type": "string",
      "description": "This is the name of the phone number. This is just for your own reference.",
      "maxLength": 40
    },
    "assistantId": {
      "type": "string",
      "description": "This is the assistant that will be used for incoming calls to this phone number.\n\nIf neither `assistantId`, `squadId` nor `workflowId` is set, `assistant-request` will be sent to your Server URL. Check `ServerMessage` and `ServerMessageResponse` for the shape of the message and response that is expected."
    },
    "workflowId": {
      "type": "string",
      "description": "This is the workflow that will be used for incoming calls to this phone number.\n\nIf neither `assistantId`, `squadId`, nor `workflowId` is set, `assistant-request` will be sent to your Server URL. Check `ServerMessage` and `ServerMessageResponse` for the shape of the message and response that is expected."
    },
    "squadId": {
      "type": "string",
      "description": "This is the squad that will be used for incoming calls to this phone number.\n\nIf neither `assistantId`, `squadId`, nor `workflowId` is set, `assistant-request` will be sent to your Server URL. Check `ServerMessage` and `ServerMessageResponse` for the shape of the message and response that is expected."
    },
    "server": {
      "description": "This is where Vapi will send webhooks. You can find all webhooks available along with their shape in ServerMessage schema.\n\nThe order of precedence is:\n\n1. assistant.server\n2. phoneNumber.server\n3. org.server",
      "allOf": [
        {
          "$ref": "#/components/schemas/Server"
        }
      ]
    },
    "number": {
      "type": "string",
      "description": "This is the number of the customer.",
      "minLength": 3,
      "maxLength": 40
    },
    "credentialId": {
      "type": "string",
      "description": "This is the credential of your own SIP trunk or Carrier (type `byo-sip-trunk`) which can be used to make calls to this phone number.\n\nYou can add the SIP trunk or Carrier credential in the Provider Credentials page on the Dashboard to get the credentialId."
    }
  },
  "required": [
    "provider",
    "id",
    "orgId",
    "createdAt",
    "updatedAt",
    "credentialId"
  ]
}

Work with this as data

Every JSON Schema here is available over the APIs.io API and to AI agents over MCP.

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

https://apis.io/mcp

Tools for schemas

4 MCP tools reach this
  • find_json_schemasBrowse and filter every JSON Schema in the catalog.
  • apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
  • resolveTurn a domain, URL or GitHub org into the provider it belongs to.
  • find_cohortsEvery scored population of providers in the catalog.
All 92 tools →

Call it yourself

curl for this page
This JSON Schema
curl "https://apis.io/api/v1/json-schemas/vapi-byophonenumber"
All schemas
curl "https://apis.io/api/v1/json-schemas?limit=25"

Discovery needs no key. Ratings and market analysis are Pro.

Get an API key

Free tier, no form to fill in. Signing in shares your email address with us — we store it to create your key and to recognise you if you sign in with another provider. See our Privacy Policy and Terms.

A second provider on the same verified email joins the account you already have.