Are 9-1-1 calls routed to the correct PSAP based on the Master Street Address Guide (MSAG)?

The correct answer highlights that 9-1-1 calls are routed to the proper Public Safety Answering Point (PSAP) based on a systematic approach that utilizes the Master Street Address Guide (MSAG). However, this routing is selective and can depend on specific conditions such as the caller's location and jurisdictional boundaries.

The MSAG is a critical component in ensuring that emergency calls are directed to the appropriate PSAP. It contains a database of physical street addresses and the associated emergency service providers for those locations. When a call is made, the automatic location information (ALI) derived from the caller's information is compared against the MSAG to determine which PSAP is responsible for providing assistance.

Selecting this option acknowledges that while the system works efficiently to direct calls, there are instances where the routing might not be perfect due to geographical or jurisdictional complexities. This reasoning validates the importance of maintaining an accurate MSAG and understanding the limitations inherent in the system.