An optional Soft Switch feature that allows you to save money by providing the same DID to multiple clients. When a DID enters the Soft Switch, and your site has a One Number Lookup Table, this table is checked for that DID. If it’s listed there, the ANI or RDNIS associated with the call will be used (instead of the DID) to route the call to the appropriate Scenario. (Note: The Routing Table is not used for calls associated with the One Number Lookup table.) You configure a One Number Lookup Table at Visual Dialplan > One Number Lookup