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 |
| 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 |
| 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. |
JSON Schema
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"$id": "#/components/schemas/CreateByoPhoneNumberDTO",
"title": "CreateByoPhoneNumberDTO",
"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]+$/`).\n\n@default true (E164 check is enabled)",
"default": true
},
"number": {
"type": "string",
"description": "This is the number of the customer.",
"minLength": 3,
"maxLength": 40
},
"credentialId": {
"type": "string",
"description": "This is the credential of your own SIP trunk or Carrier (type `byo-sip-trunk`) which can be used to make calls to this phone number.\n\nYou can add the SIP trunk or Carrier credential in the Provider Credentials page on the Dashboard to get the credentialId."
},
"name": {
"type": "string",
"description": "This is the name of the phone number. This is just for your own reference.",
"maxLength": 40
},
"assistantId": {
"type": "string",
"description": "This is the assistant that will be used for incoming calls to this phone number.\n\nIf neither `assistantId`, `squadId` nor `workflowId` is set, `assistant-request` will be sent to your Server URL. Check `ServerMessage` and `ServerMessageResponse` for the shape of the message and response that is expected."
},
"workflowId": {
"type": "string",
"description": "This is the workflow that will be used for incoming calls to this phone number.\n\nIf neither `assistantId`, `squadId`, nor `workflowId` is set, `assistant-request` will be sent to your Server URL. Check `ServerMessage` and `ServerMessageResponse` for the shape of the message and response that is expected."
},
"squadId": {
"type": "string",
"description": "This is the squad that will be used for incoming calls to this phone number.\n\nIf neither `assistantId`, `squadId`, nor `workflowId` is set, `assistant-request` will be sent to your Server URL. Check `ServerMessage` and `ServerMessageResponse` for the shape of the message and response that is expected."
},
"server": {
"description": "This is where Vapi will send webhooks. You can find all webhooks available along with their shape in ServerMessage schema.\n\nThe order of precedence is:\n\n1. assistant.server\n2. phoneNumber.server\n3. org.server",
"allOf": [
{
"$ref": "#/components/schemas/Server"
}
]
}
},
"required": [
"provider",
"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.
Call it yourself
curl for this page
This JSON Schema
curl "https://apis.io/api/v1/json-schemas/vapi-createbyophonenumberdto"
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.