Alternate routing is also referred to as 'overflow' routing. When does it occur?

Alternate routing is also referred to as 'overflow' routing. When does it occur?

• A. It reroutes calls during a PSAP outage to a different PSAP.
• B. It redirects calls to a predesignated location when all 911 circuits to a PSAP are busy.
• C. It is used to forward all calls to backup centers during routine maintenance only.
• D. It sends calls to the most distant PSAP for load balancing.

Answer: (B)

Overflow routing redirects new 9-1-1 calls to a predesignated backup location when all 911 circuits to the primary PSAP are busy. This keeps emergency access available even during high call volumes by handing off incoming calls to another answering point that’s prepared to handle them. It isn’t about outages or routine maintenance, and it isn’t about sending calls to the farthest PSAP; the backup location is specifically chosen to manage load and maintain timely response.

Overflow routing redirects new 9-1-1 calls to a predesignated backup location when all 911 circuits to the primary PSAP are busy. This keeps emergency access available even during high call volumes by handing off incoming calls to another answering point that’s prepared to handle them. It isn’t about outages or routine maintenance, and it isn’t about sending calls to the farthest PSAP; the backup location is specifically chosen to manage load and maintain timely response.