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Error - 21205

Invalid URL

You attempted to initiate an outbound phone call, but the URL you specified to handle the call was not a valid URL.

If you specified an Application Sid for your outbound phone call, the application must have a valid VoiceUrl or the call will fail.

Possible Solutions

Make sure you submit a fully qualified URL including:

  • protocol (http:// or https://)
  • hostname
  • file path
  • properly url-encoded query parameters

Twilio must be able to reach this URL over the public Internet.