dnc_expiry_not_supported

HTTP 422§9.5 Campaigns, scrubbing, consent, and DNC

An internal DNC entry may not carry expires_at. Recording one withdraws the consent behind the number and sets the contact's do-not-call flag, and neither is restorable when a suppression lapses - an expiry would destroy consent evidence permanently and then return the number to dialable. Internal DNC is a suppression that persists.

Problem shape

Every non-2xx response is an RFC 9457 application/problem+json body. The type URI below is stable and machine-matchable, so branch on the final path segment (the code) and treat the status as redundant confirmation. See the error-handling guide.

{
  "type": "https://docs.vocapable.com/errors/dnc_expiry_not_supported",
  "title": "…",
  "status": 422,
  "detail": "…",
  "instance": "/v1/…"
}

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