caller_id_is_a_line

HTTP 409§9.17 The customer team workspace on the phone (`/v1/mobile/workspace/*`, `/v1/mobile/voice/token`)

The number is already one of the company's lines on its Twilio account; choose it as caller ID directly.

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

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