whatsapp.call_concurrency_limit

HTTP status	429
Area	WhatsApp (from Meta)
Problem type	https://docs.nexafone.so/errors/whatsapp.call_concurrency_limit

What the detail says

The detail explains the occurrence; it can read, for example:

• This number has too many calls in progress. Try again when one ends.

Handling it

Slow down: wait Retry-After seconds, or back off, then retry.

Example

{
  "type": "https://docs.nexafone.so/errors/whatsapp.call_concurrency_limit",
  "title": "Too Many Requests",
  "status": 429,
  "code": "whatsapp.call_concurrency_limit",
  "detail": "This number has too many calls in progress. Try again when one ends.",
  "requestId": "01J9Z8Q4TQ3W6M5V2X7Y8Z9A0B"
}

Match on code, never on detail: the wording may change. See Problem Details.