n. Service management does not end with provisioning and configuring of the service. This is followed by active monitoring on the service and an infrastructure to deter- mine the quality of service (QoS) actually delivered by the network. Based on the What Is OSS and BSS? events generated during monitoring, the network configuration is fine tuned to rec- oncile the delivered QoS with customer expectations. These events also help in net- work planning, SO that next time a similar service is configured, better results can be obtained from initial settings of the network. Service level events are handled by the support systems. The customer, as well as service providers, also require reports on the service. The customer would be interested in reports like billing, value-added services used, and when a service outage occurred. The service provider would be working on reports related to resource capacity, utilization, bugs raised, and the SLA breaches to be compensated. The generation of reports is a functionality of the support systems. 19.4.3 Support Systems to Manage Resources The infrastructure management is traditionally a part of the support systems. The support system is expected to ensure the proper operation of the network and ele- ments that make the infrastructure for hosting the services. The installation of soft- ware and updates in the elements needs to be managed. When service configuration is triggered, the network and its elements need to be configured before setting the service level configuration. Once the elements are configured with necessary hard- ware and software, the system needs to be tested. This full cycle of network provi- sioning including configurations needs to be managed by the support systems. Inventory management is another important module in support systems. Based on requirements, the inventory needs to be supplied for service fulfillment. Faulty inventory needs to be removed and free resources after use needs to be reallocated. Also included in the management of resource is monito