The CallRetryConfig object

Daily time windows in which calls may be placed, on the allowed_days. A call due outside every window waits for the next one to open. Request bodies need at least one window.

Maximum number of call attempts, first call included. Default: 5. Capped by the organization's plan: 5 on Starter, 8 on Business. A contact nobody picks up is billed once all its attempts were placed.

Days of the week when calls are allowed, in the same timezone as the calling windows. Default: Monday through Friday.

Calendar dates on which no call goes out, such as public holidays or days the office is closed, as 'YYYY-MM-DD' (e.g. ['2026-12-25', '2027-01-01']). Read in the same timezone as the calling windows: each callee's local date when timezone is null. A call or retry that would land on an excluded date waits for the next open window after it. Up to 366 dates; duplicates are removed and the list is sorted. A call placed with skip_calling_window ignores them for its first dial only. Default: none.

Double call. If true and max_retry_attempts >= 2, when the first attempt reaches nobody (no answer, declined, voicemail, call screening nobody took), the second attempt is dialed within seconds instead of after retry_delay_seconds, from the same caller number. Two calls in a row from one number raise the pickup rate. Each call is an attempt: the double call counts as 2 when both calls happen, 1 when the first is picked up. Busy or unreachable phones are retried after the normal delay. Calling days and hours still apply. Only the first attempt is doubled; later ones follow retry_delay_seconds. A voicemail_message is left on the second dial only. Default: false.