shared_phone_hold_music_invalid
Not usable hold music. errors[0].reason: not_base64, unsupported_format (only MP3 or WAV, sniffed from the bytes), undecodable, too_short (under a second), too_long (over 10 minutes) or too_large (over 5 MB).
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/shared_phone_hold_music_invalid",
"title": "…",
"status": 422,
"detail": "…",
"instance": "/v1/…"
}