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700001: line busy: one call at a time per dongle

HTTP status: 409
Where you see it: HTTP

Why it happens

The line already has a call up, through the API or its SIP login: it's one SIM in one dongle.

What to do

Wait for the call to end, then try again. Calls are never queued.

The error body

{
  "code": 700001,
  "message": "line busy: one call at a time per dongle",
  "more_info": "https://docs.dongleswithwings.com/errors/700001",
  "status": 409
}