contact_timezone_unresolved
Dialability cannot be answered because the contact has no resolved timezone, and quiet hours are evaluated in the callee's local time. Fail-closed: no verdict is guessed.
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/contact_timezone_unresolved",
"title": "…",
"status": 409,
"detail": "…",
"instance": "/v1/…"
}