Yes, mapping two Direct Inward Dialing (DID) numbers to a toll-free number is a best practice—and in most cases, required—to ensure uninterrupted call handling.
If the primary DID becomes unreachable (e.g., due to technical failure or downtime), the call is automatically routed to the secondary DID. This avoids service disruption.
The second DID acts as a backup line if:
During high traffic periods, having multiple DIDs allows you to balance call volume more evenly, improving response times and customer satisfaction.
Since toll-free numbers are often used for support, helplines, or campaign response, ensuring maximum uptime is critical.