It does not replace any of the existing emergency or non-emergency medical services but complements those already existing and enables callers who might not be fully able to diagnose themselves to be directed to care of an appropriate level of urgency, including transport to hospital if the diagnosis merits that action.
It doesn't replace any of the current emergency or non-emergency medical services; rather, it complements them by guiding callers needing urgent care to suitable levels of treatment, which might include hospital transportation when needed.