def update(self, ip_address=values.unset, friendly_name=values.unset,<EOL>cidr_prefix_length=values.unset):
return self._proxy.update(<EOL>ip_address=ip_address,<EOL>friendly_name=friendly_name,<EOL>cidr_prefix_length=cidr_prefix_length,<EOL>)<EOL>
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