Out-Of-Session Callback Error

Callback to Out-of-Session handler returned a non-success status code.

• Your Out-of-Session callback URL is invalid.

• Verify that your Out-of-Session callback URL is valid and that your server is correctly processing Out-of-Session callbacks from Proxy.
• Please read over the [Out-Of-Session Callback guide] ( https://www.twilio.com/docs/proxy/out-session-callback-response-guide ) for more detailed information.