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):
          
          data = values.of({
              'Url': url,
              'Method': method,
              'Status': status,
              'FallbackUrl': fallback_url,
              'FallbackMethod': fallback_method,
              'StatusCallback': status_callback,
              'StatusCallbackMethod': status_callback_method,
          })
  
          payload = self._version.update(
              'POST',
              self._uri,
              data=data,
          )
  
          return CallInstance(
              self._version,
              payload,
              account_sid=self._solution['account_sid'],
              sid=self._solution['sid'],
          )
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