ictbilling
A client management, billing and e-commerce solution
...Client module handles clients user interfaces, subscribed service details, service links, list of available addons and current balance. Another module, ICTService creates simple rules that adds top-up, purchase of add-on, assign/revoke permission, create and assign agent / extensions. ICTService also manages a form that allows new customers to choose a package to subscribe. Ratelist module directly connects with service portal's rate list and imports complete rate list in the Drupal table for rate list.