In accordance with the invention, a Logging Administration Maintenance and Billing Entity (LAMB) is interfaced to a network transport bus for logging network traffic, for error tracking, error replay, and billing functions. In the exemplary embodiment, the LAMB records transactions from a subscriber configuration interface (SCI). Information about SCI transactions may include, for example, time, date, originator information, transaction ID, destination information, message information, SCI functions accessed by the originator, errors, and any other function or process performed by the SCI.