telephony_provider_unsupported

HTTP 503§9.7 Telephony accounts, phone numbers, and pools

The account names a carrier this build registers no adapter for. Raised by adapter_factory_for, the ADAPTER_FACTORIES lookup that is the dispatch since 2026-08-20 - it replaced the single account.provider != TWILIO_PROVIDER comparison that used to be the whole of it, and the detail is byte-identical to what that comparison raised.

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/telephony_provider_unsupported",
  "title": "…",
  "status": 503,
  "detail": "…",
  "instance": "/v1/…"
}

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