AstBill

http://astbill.com/whatis

This billing system I have implemented and tested to work for both prepaid and post paid billing

Simple to setup with asterisk and easy to manage.

Uses: AstBill Drupal Mysql Apache

Calls pass to Asterisk from ser for termination to PSTN. They are rated and billed.

I have edited SERWEB to display account records and current prepaid balances from Astbill database

Check it out it works