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 originating and terminating calls that is essentially equivalent within each of the networks, wherein the initial filter criteria for a particular network contains the same applications and ordering as its peer network with the exception of a network application selection server for the particular network that is placed first in a list of criteria for terminating calls; synchronizing the customer's additional mapping and routing data between the multimedia networks; and storing the customer's synchronized initial filter criteria and additional mapping and routing data in a database in each of the multimedia networks.