Calls forwarded to another phone#

I have a question. Why would some of these scammers use toll free numbers and then have the calls forwarded to other phone numbers. when I use FireRTC I can see that they pickup and then it continues to ring in a different tone? any ideas?

@Loki101#52227 One explanation is D.I.D.

(for example to a PBX in India)

Direct Inward Dialing (DID) is a service of a local phone company (or local exchange carrier) that provides a block of telephone numbers for calling into a company’s private branch exchange (PBX) system.