What billing should be installed with the provider?

Question

Computer networks

The situation is this, I had to take over the network.
About 300 subscribers, connection via static ip, each house has a subnet, one tariff, no billing.
Began to think towards network reassembly. To begin with, I decided to install Ubilling, but the following questions appeared:
1) will I need to install RADIUS as well?
2) I understand that billing will not work on statics? i.e. is it necessary to authorize users?
3) maybe there are better options for Ubilling? freeware.

Answer 1

Actually, among open source certified solutions, there are generally 2 options: Abills and Mikbill.
the latter was chosen.

Answer 2

Certified :)
If a provider providing services to the population, then the billing must be certified - otherwise you will be tempted to prove that the client must pay N rubles, and not M. Well, in Russia at least.