receptionist_candidate_number_in_use

HTTP 409§9.3 Agents, templates, knowledge packs, voice profiles

The chosen number already has an inbound route (another agent, a voicemail route, or an answering policy). A candidate is staged only on an unrouted number or on its own candidate line; a working line is never replaced.

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/receptionist_candidate_number_in_use",
  "title": "…",
  "status": 409,
  "detail": "…",
  "instance": "/v1/…"
}

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