How Toll-Free Database Service Works

When a subscriber calls a toll-free number from your area:

• Your switch receives the call and launches a query over the TNS SS7 network.
• The TNS network routes the query to the Toll-Free Database Service and identifies the appropriate carrier for the call, and other routing information as needed.
• The TNS network returns the response to your Service Switching Point (SSP) for correct call routing.
• TNS offers an electronic monthly 11-50-86 data file that provides customers with a breakdown of query counts by long-distance providers