1. In a telecommunications system including at least two multimedia networks, a method for provisioning a peering relationship between the multimedia networks, the method comprising: registering a customer with at least one of the multimedia networks; constructing the customer's initial filter criteria for both origination and terminating calls that is essentially equivalent within each of the networks; synchronizing the customer's mapping and routing data between the multimedia networks; and storing the customer's mapping and routing data in a database in each of the multimedia networks.