Is it necessary to map 2 DIDs with a toll free number? Why?

Is it necessary to map 2 DIDs with a toll free number? Why?

Yes, it is necessary to map 2 DIDs with a toll free number. Mapping two DIDs for each toll free number ensures that you do not lose any customer’s call because when the Primary DID breaks down for some reason, the call automatically lands on the Secondary/ Failover DID.