Excell's directory assistance database is sourced from telecommunications companies. Data from all seven RBOCS are included, as well as independents from each region. brandmedicines.com

The database provides value-added services such as verifying localities, adding ZIP codes when possible, checking for duplicate listings, and merging data from multiple sources.

Excell contracts with an independent consulting company to perform regular audits of the database accuracy, as well as performing ongoing internal audits. The database consistently scores an accuracy of at least 97%.