generated: '2026-10-08'
method: searched
source: https://developers.sinch.com/docs/numbers/api-reference/error-codes/status-codes.md; https://developers.sinch.com/docs/verification/api-reference/errors.md;
  https://developers.sinch.com/docs/number-lookup-api-v2/api-reference/errors.md; https://developers.sinch.com/docs/voice/api-reference/errors.md
name: Sinch documented error references
format: 'per-product JSON error objects: Numbers {error: {code, message, status, details[]}}; Verification and Voice {errorCode
  (five-digit), message}; Number Lookup {code, message, traceId}; Fax and Porting {code, message}; no RFC 9457 problem+json'
envelope: see format
pages:
  Numbers API status codes: https://developers.sinch.com/docs/numbers/api-reference/error-codes/status-codes
  Numbers provisioning errors: https://developers.sinch.com/docs/numbers/api-reference/error-codes/provisioning-errors
  Verification API errors: https://developers.sinch.com/docs/verification/api-reference/errors
  Voice API errors: https://developers.sinch.com/docs/voice/api-reference/errors
  Elastic SIP Trunking errors: https://developers.sinch.com/docs/est/api-reference/errors
  Number Lookup errors: https://developers.sinch.com/docs/number-lookup-api-v2/api-reference/errors
problems:
- status: 200
  title: OK
  description: OK. The request was successful. details summary See a sample This is a sample of the response for a phone number
    search.
  api: Numbers API
  source: https://developers.sinch.com/docs/numbers/api-reference/error-codes/status-codes
- status: 201
  title: Created
  description: Created. The `POST` request was successful and a new resource was created.
  api: Numbers API
  source: https://developers.sinch.com/docs/numbers/api-reference/error-codes/status-codes
- status: 400
  code: 40001
  title: Number +4813 is invalid.  Too short.
  description: The 40001 error indicates a parameter validation failure. This error occurs when one or more parameters in
    the request are invalid. The error message provides specific details about issues in the requ
  api: Verification API
  source: https://developers.sinch.com/docs/verification/api-reference/errors
- status: 400
  code: 40003
  title: Invalid identity or code.
  description: The 40003 error indicates an invalid request. This error occurs when the request cannot be processed, despite
    all parameters being syntactically valid. In some cases, resolving a 40003 error is straig
  api: Verification API
  source: https://developers.sinch.com/docs/verification/api-reference/errors
- status: 401
  code: 40100
  title: Invalid authorization header.
  description: A 40100 error is an authorization header error. It means the authorization header is missing, illegal, or invalid.
    You can fix this by providing a valid [authorization](/docs/verification/api-referenc
  api: Verification API
  source: https://developers.sinch.com/docs/verification/api-reference/errors
- status: 401
  code: 40101
  title: X-Timestamp required.
  description: A 40101 error is a timestamp header error. It means that the `x-timestamp` header is invalid or missing. You
    can fix this by providing a valid [`x-timestamp`](/docs/verification/api-reference/authenti
  api: Verification API
  source: https://developers.sinch.com/docs/verification/api-reference/errors
- status: 401
  code: 40102
  title: Invalid signature.
  description: A 40102 error is an invalid signature error. It means that the signature in your signed request authentication
    is invalid or missing. You can fix this by providing a valid [signature](/docs/verificati
  api: Verification API
  source: https://developers.sinch.com/docs/verification/api-reference/errors
- status: 401
  code: 40104
  title: Authorization required.
  description: A 40104 error is an authorization required error. It means that your request is missing authentication.
  api: Verification API
  source: https://developers.sinch.com/docs/verification/api-reference/errors
- status: 401
  code: 40107
  title: Invalid authorization.
  description: A 40107 error is an invalid authorization error. It means some part of your authentication is incorrect. You
    can fix this by ensuring your authorization configuration is configured correctly.
  api: Verification API
  source: https://developers.sinch.com/docs/verification/api-reference/errors
- status: 402
  code: 40200
  title: Not enough credit.
  description: ''
  api: Verification API
  source: https://developers.sinch.com/docs/verification/api-reference/errors
- status: 403
  code: 40300
  title: Identity is blacklisted.
  description: 'The 40300 error indicates a forbidden request. The Verification API may return this error in various situations,
    including: - Data Verification is not available for the requested destination, - The de'
  api: Verification API
  source: https://developers.sinch.com/docs/verification/api-reference/errors
- status: 403
  code: 40303
  title: Callback URL must be set when using public authorization method.
  description: 'The 40303 error indicates a restricted action. This error typically occurs when the requested action is not
    permitted due to one of the following reasons: - The action was explicitly denied by a callb'
  api: Verification API
  source: https://developers.sinch.com/docs/verification/api-reference/errors
- status: 404
  code: 40400
  title: Requested resource was not found.
  description: 'This error can be returned in various circumstances, including: - Attempting to perform actions such as reporting
    or checking the status of a verification that was not initiated (similar to the 40003 '
  api: Verification API
  source: https://developers.sinch.com/docs/verification/api-reference/errors
- status: 409
  code: 40900
  title: Reference already defined.
  description: 'This error can be returned in one case: - Reference specified in the request is a duplicate'
  api: Verification API
  source: https://developers.sinch.com/docs/verification/api-reference/errors
- status: 422
  code: 42200
  title: Application name has not been configured.
  description: This error is related to misconfiguration of Verification App in [Sinch Dashboard](https://dashboard.sinch.com).
  api: Verification API
  source: https://developers.sinch.com/docs/verification/api-reference/errors
- status: 422
  code: 42201
  title: No route to destination.
  description: The 42201 error indicates that there is no available route to the destination number. Consequently, Sinch is
    unable to send SMS messages, initiate calls, or perform other actions targeting the specifi
  api: Verification API
  source: https://developers.sinch.com/docs/verification/api-reference/errors
- status: 429
  code: 42900
  title: Request capacity exceeded.
  description: This error occurs when rate limit is exceeded. It means that the number of requests sent to the API exceeds
    the allowed limit.
  api: Verification API
  source: https://developers.sinch.com/docs/verification/api-reference/errors
- status: 429
  code: 42901
  title: Cannot initiate verification to the same number too quickly.
  description: This error occurs when verification of the same number is attempted too many times within a short period of
    time.
  api: Verification API
  source: https://developers.sinch.com/docs/verification/api-reference/errors
- status: 500
  code: 50000
  title: Internal server error.
  description: ''
  api: Verification API
  source: https://developers.sinch.com/docs/verification/api-reference/errors
- status: 503
  code: 50300
  title: Service is temporarily unavailable, please try again later.
  description: This error means that service is temporarily down. Try again later.
  api: Verification API
  source: https://developers.sinch.com/docs/verification/api-reference/errors
- status: 503
  code: 50301
  title: Configuration error, please contact support.
  description: 'This error means that there is a misconfiguration in the Sinch system related to your account. Contact support
    to resolve this issue. ## Troubleshooting the Verification API When making phone calls wi'
  api: Verification API
  source: https://developers.sinch.com/docs/verification/api-reference/errors
- status: 400
  title: One or more errors occurred in the request
  description: We cannot process the request due to something incorrect or malformed in the client's request
  remediation: Verify the request model as it is invalid, and adjust it according to the error message.
  api: Number Lookup API v2
  source: https://developers.sinch.com/docs/number-lookup-api-v2/api-reference/errors
- status: 401
  title: Invalid authorization
  description: Incorrect credentials
  remediation: Verify the authorization header to ensure it is correct and adheres to the requirements outlined in the authentication
    section of the documentation.
  api: Number Lookup API v2
  source: https://developers.sinch.com/docs/number-lookup-api-v2/api-reference/errors
- status: 402
  title: Account locked due to insufficient funds
  description: Sinch credit balance is negative
  remediation: Top up balance on Sinch Dashboard or contact your account manager.
  api: Number Lookup API v2
  source: https://developers.sinch.com/docs/number-lookup-api-v2/api-reference/errors
- status: 403
  title: Number lookup for the requested country is disabled.
  description: Number lookup for the requested country is disabled for your account. Please contact support for more information
    on enabling services for this country.
  remediation: Number Lookup for Canadian numbers is only available to customers with a CLNPC license. Please refer [here](/docs/number-lookup-api-v2/overview#canada-number-lookup)
    for information on obtaining a lic
  api: Number Lookup API v2
  source: https://developers.sinch.com/docs/number-lookup-api-v2/api-reference/errors
- status: 403
  title: Line type lookup feature is disabled
  description: Line type lookup feature is disabled for this application
  remediation: Enable line lookup feature for the application on Sinch Dashboard.
  api: Number Lookup API v2
  source: https://developers.sinch.com/docs/number-lookup-api-v2/api-reference/errors
- status: 403
  title: Line type use cases not specified
  description: ''
  remediation: Please refer [here](/docs/number-lookup-api-v2/overview#line-type-use-cases) for information on specifying
    use cases.
  api: Number Lookup API v2
  source: https://developers.sinch.com/docs/number-lookup-api-v2/api-reference/errors
- status: 404
  title: Number not found
  description: Requested number not found from data set
  remediation: Double check if number is correct.
  api: Number Lookup API v2
  source: https://developers.sinch.com/docs/number-lookup-api-v2/api-reference/errors
- status: 429
  title: Rate limit exceeded
  description: ''
  remediation: The default rate limit is 10 requests per second. If a higher capacity is required, please contact us.
  api: Number Lookup API v2
  source: https://developers.sinch.com/docs/number-lookup-api-v2/api-reference/errors
- status: 500
  title: Internal server error
  description: Error occurred on server side
  remediation: The error occurred on the server side. Please provide the `traceId` from the response, so we can investigate
    the issue further.
  api: Number Lookup API v2
  source: https://developers.sinch.com/docs/number-lookup-api-v2/api-reference/errors