Call pattern data is generated for scheduling calls between a number of sites connected to a communication network. The call pattern data defines instructions for a number of sites to make a number of connections across the network to other sites over a predetermined period. This is achieved by creating a list of calls to be scheduled and then assigning in turn each of the calls to a source and a destination site. The source site and destination site are selected to satisfy one or a number of call constraint criteria associated with each call. The call pattern data representing the call is then generated and stored on a computer storage medium for subsequent download to the sites.
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