def update(self, url=values.unset, method=values.unset, status=values.unset,<EOL>fallback_url=values.unset, fallback_method=values.unset,<EOL>status_callback=values.unset, status_callback_method=values.unset):
data = values.of({<EOL>'<STR_LIT>': url,<EOL>'<STR_LIT>': method,<EOL>'<STR_LIT>': status,<EOL>'<STR_LIT>': fallback_url,<EOL>'<STR_LIT>': fallback_method,<EOL>'<STR_LIT>': status_callback,<EOL>'<STR_LIT>': status_callback_method,<EOL>})<EOL>payload = self._version.update(<EOL>'<STR_LIT:POST>',<EOL>self._uri,<EOL>data=data,<EOL>)<EOL>return CallInstance(<EOL>self._version,<EOL>payload,<EOL>account_sid=self._solution['<STR_LIT>'],<EOL>sid=self._solution['<STR_LIT>'],<EOL>)<EOL>
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