me location register) or HSS (home subscriber server) and an example of migration is to move data from a legacy HLR to an IP HLR. The provisioning task requires considerable planning and coordination that is managed by the provisioning module. The subscriber solutions are usually generic provisioning modules that facilitate subscriber provisioning across multiple network elements. The migration source and destination can be set or defined by the user. The rich user interface makes it easy for the operator without much prior provisioning experience to effectively do subscriber provisioning and migration without taking inputs from an engineer. In subscriber provisioning, the management module directly interacts with the module that manages and maintains the subscriber data. 41. Network data mediation: These applications take data from multiple network elements and reformat the data to a format that can be used by multiple upper Management Applications layer service and business support modules. Network data mediations mainly provide feed to the monitoring system. The data from the different network elements will be in different formats and the mediation component does the job of converting to a common readable format. Mediation applications are usually used with most OSS system that take data from multiple elements or element management systems. When stan- dard interfaces are not used, change in network element brings in significant development to change the mediation system to support the new or changed element. Control commands and messages can be exchanged through the network data mediation solution. Most of the current mediation solutions are standards based to support the multiple northbound and southbound interfaces. In addition to formatting, some of the other functions performed by mediation system include parsing, correlation, and rule-based message handling. 42. Event management and correlation: Fault data is a critical source of infor- mation in automating management functionality. Predefined actions can