The service monitors each and every call delivery attempt and will automatically switch calls to flow through the secondary path to the customer's network should delivery problems be experienced. Calls are rerouted when the following signals are detected:
- NU (Number Unobtainable)
- Unknown failure (does not include: No answer, Busy or Accept)
The Authorised Contact can force calls to flow through the secondary path at any time by calling the Business Continuity Administration service phone number, entering the correct user ID and password, and then following the menu options.