We have added a chapter to the telecom guide with the details of how to configure and extend this new module. The provisioning module was introduced in the 1.1.3 release, about two months ago. It is a complex module that can help greatly with the painful integration needed between the billing system and those systems responsible for serving your services to the end customers.
This module has been designed for flexibility. So much so, that you can use it outside jBilling. You can deploy the provisioning module and use it to simplify the interaction between any system and your services. We use message queues (through JMS) to achieve that level of modularity. In fact, jBilling core acts just like another client when sending and receiving commands to the provisioning module.