Currently maxis only provide private ip for all subscriber by default hence making portforwarding not possible or accessing ur CCTV system from outside not possible.

To obtain a public ip access do the following:-
1) have your account no ready.
2) contacts the service center
3) tell them you need public ip.
4) the Service assistant will submit your request for approval this may take 2 to 5 days
5) once approved their internal team will need to make some modification to ur account.
6) they will contact you when approved & modification is done.
7) they will talk you thru the steps on how to make changes to the router.
8) reboot the device.

Once done you have a Public IP but in order to keep track of it. You need to subscribe to DDNS services like no-ip.org etc as ur ip changes once a while.