prises separate tasks that may be performed independently. If the project has more avail- able planning resources the tasks are shared and performed concurrently, speeding up project completion. The tasks performed in this module are network blocking analysis, signalling network analysis, traffic routing analysis, network load observation, alarm and fault analysis, and the network synchronisation review. A model of the present state of the network is made to identify bottlenecks, waste capacity, load-distribution problems, protection issues and underperforming parts of the network. The improved network is also modelled with Direct+ and the results are presented in the final report. Optimisation measures are identified and outlined in a report for each separate task. A report on other optimisation measures such as network parameter build upgrade and tuning, capacity upgrade or reshuffling, and technological upgrade performed during the network audit should also be updated and prepared for implementation. Voice Network Plan Review The existing network architecture should be analysed for resilience in failure situation. It is important when determining the number of CS core network elements and their physical interconnections. The number of circuits and circuit groups should be determined. This is important information before collecting circuit group traffic measurements. The destinations, subdestinations and defined routes should be analysed to determine the internal routing strategy. The amount of voice traffic per route depends on the end-to-end routing strategy used in the network. In load-sharing the amount of traffic is shared in proportions defined by the user. If there are two routes to a given destination, the amount of traffic per route may be defined as 50 % and 50 %. This also means that the two routes should have the same capacity. In alternative routing, the traffic to a given destination is routed through the primary route and only in the failure situation is the secondary route used. The primary rout