code: def update(self, url=values.unset, method=values.unset, status=values.unset,
                 fallback_url=values.unset, fallback_method=values.unset,
                 status_callback=values.unset, status_callback_method=values.unset):
          
          return self._proxy.update(
              url=url,
              method=method,
              status=status,
              fallback_url=fallback_url,
              fallback_method=fallback_method,
              status_callback=status_callback,
              status_callback_method=status_callback_method,
          )
docs: Update the CallInstance
  
          :param unicode url: The absolute URL that returns TwiML for this call
          :param unicode method: HTTP method to use to fetch TwiML
          :param CallInstance.UpdateStatus status: The new status to update the call with.
          :param unicode fallback_url: Fallback URL in case of error
          :param unicode fallback_method: HTTP Method to use with fallback_url
          :param unicode status_callback: The URL we should call to send status information to your application
          :param unicode status_callback_method: HTTP Method to use to call status_callback
  
          :returns: Updated CallInstance
          :rtype: twilio.rest.api.v2010.account.call.CallInstance