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The Bandwidth Voice API will report call errors via Webhooks to the call status URL defined in your voice application.

Errors can also be found for a specific call by querying the call.

HTTP Status Codes

Bandwidth will return a HTTP-400 Error when the request is malformed or invalid. See the message of the error for tips before trying again.

HTTP/1.1 400 Bad Request
Content-Type: application/json;charset=UTF-8

"type" : "validation",
"description" : "Invalid to: must be an E164 telephone number",
"id" : null