Methods are provided for managing communications over a communications routing network. A data store is maintained of records of communications links established over the communications routing network between a first endpoint of the communications routing network and multiple second endpoints of the communications routing network distinct from the first endpoint. A frequency analysis is performed of the second endpoints to identify a frequency of establishing a communications link between the first endpoint and each of the second endpoints. A list is generated of a subset of the second endpoints in accordance with a result of the frequency analysis.