Error 15003

Error - 15003

Call Progress: Error Response to Callback URL

Got an HTTP error in response to the callback URL

Possible Causes

  • Your application returned a 4xx or 5xx HTTP response to Twilio.

Possible Solutions

Ensure your application responds to callbacks with:

  • 200 OK
  • Content-Type: text/xml
  • Valid TwiML

Or respond with 204 No Content and an empty response body.

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