inbound_voicemail_not_found
No inbound voicemail receipt of that id belongs to this tenant. It is intentionally distinct from call_not_found: a receipt exists before audio has been imported into a normal Call.
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/inbound_voicemail_not_found",
"title": "…",
"status": 404,
"detail": "…",
"instance": "/v1/…"
}