Reachability checks

POST /v1/reachability-checks

{ "numbers": ["9876543210", "9876543211"], "hold_sec": 12, "metadata": { "list": "dpd-8-30" } }

Mode	What happens	Results
`answer` (default)	Rings; if a person answers, holds `hold_sec` and hangs up.	`reachable`, `voicemail`, `no_answer`, `busy`, `switched_off`, `invalid`, `failed`
`ring`	Hangs up as soon as the phone rings: see Missed calls.	`ringing`, `switched_off`, `invalid`, `busy`, `failed`

Up to 1000 numbers. Duplicates and numbers over the daily cap are skipped.
Runs inside your human calling hours; otherwise the check is waiting_window.
Results: GET /v1/reachability-checks/{id}/results, and reachability.result per number, reachability.completed at the end.
Stop: POST /v1/reachability-checks/{id}/cancel.