Multiple Service Type Calls

This document provides a review of the topics that are associated with the practice of delivering more than one type of an emergency call over the same trunk group into a legacy type E9-1-1 selective router.   It describes the market forces leading to the implementation of the practice as well as the technological pros and cons associated with it. The technical and operational implications of the practice are addressed from the perspective of many separate areas, including groups such as the originating service provider, network aggregator, E9-1-1 system service provider, Public Safety Agency (i.e., PSAP management/call takers), and regulatory bodies that govern 9-1-1 operations.