Website for VOIP telephony

Good afternoon, dear ones,

There is an order for the creation of a site by type: http://12voip.com

It's VOIP telephony.

But! The site should be running on PHPNuke. I know this system and its resistance to hacking.
Or if you have your own decisions, you can listen to them.

The main task is to create a website that will work on full automation.
The principle is:
A new customer logs in, registers, and associates their phone number with the system. He pays for services and uses telephones. At the same time, the client can check the balance on his account at any time. Add or delete the phone numbers from which he will call.
Payment system: You can simply take from the same site - the system is used on absolutely all sites of this type.
Support for multiple languages. The main European: English, German, French, naturally Russian. That’s why I would like to organize all this on PHPNuke, which supports more than 20 languages.

I would like to know if you can do that. If so, how much will it cost?
All the necessary APIs are in place.

With respect, Peter Podobrikhin