The capability of routing 911 calls to a designated alternate location if all 9-1-1 trunks are busy or out of service.

• A. Microwave
• B. Satellite
• C. Alternate routing
• D. 911 Direct Trunking

Answer: (C)

Alternate routing allows 911 calls to be redirected to a designated backup location when all primary 9-1-1 trunks are busy or out of service. This built-in redundancy ensures continued access to emergency help by routing new calls to a prearranged alternate PSAP or backup facility the moment congestion or a failure is detected. It’s a key part of PSAP continuity planning and 911 network design, so even if the main path is saturated or unavailable, callers can still reach emergency responders through the backup site.

The other options describe types of transmission or a different trunking concept, not the automatic rerouting mechanism. Media like microwave or satellite refer to how the signal travels, not the routing decision. 911 Direct Trunking is about the dedicated lines to the PSAP, but it doesn’t inherently specify diverting traffic to an alternate location when the primary path is compromised.