'Update the IpAddressInstance
:param unicode ip_address: The ip_address
:param unicode friendly_name: The friendly_name
:returns: Updated IpAddressInstance
:rtype: twilio.rest.api.v2010.account.sip.ip_access_control_list.ip_address.IpAddressInstance'

def update(self, ip_address=values.unset, friendly_name=values.unset):

    data = values.of({'IpAddress': ip_address, 'FriendlyName': friendly_name})
    payload = self._version.update('POST', self._uri, data=data)
    return IpAddressInstance(self._version, payload, account_sid=self._solution['account_sid'], ip_access_control_list_sid=self._solution['ip_access_control_list_sid'], sid=self._solution['sid'])
