target to POST /v1/calls. unavailable is true when Voice can’t be asked right now; an account without Voice gets an empty list.
Needs the
calls:read scope.Request
Response
200 OK
Errors
Every refusal is{"error": {"code", "message", "field"}}; field is there when one input is at fault.
Any request can also be refused for its key, its account or its rate (
key_required, invalid_key, account_suspended, plan_excludes_api, address_not_allowed, rate_limited); see the overview.