code: def update(self, ip_address=values.unset, friendly_name=values.unset,
                 cidr_prefix_length=values.unset):
          
          data = values.of({
              'IpAddress': ip_address,
              'FriendlyName': friendly_name,
              'CidrPrefixLength': cidr_prefix_length,
          })
  
          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'],
          )
docs: Update the IpAddressInstance
  
          :param unicode ip_address: An IP address in dotted decimal notation from which you want to accept traffic. Any SIP requests from this IP address will be allowed by Twilio. IPv4 only supported today.
          :param unicode friendly_name: A human readable descriptive text for this resource, up to 64 characters long.
          :param unicode cidr_prefix_length: An integer representing the length of the CIDR prefix to use with this IP address when accepting traffic. By default the entire IP address is used.
  
          :returns: Updated IpAddressInstance
          :rtype: twilio.rest.api.v2010.account.sip.ip_access_control_list.ip_address.IpAddressInstance