ContactCenterWorld - Definition
Encompass any type of unwanted, unsolicited, telephone call. Common types of nuisance calls include prank calls, telemarketing calls, and silent calls. Obscene phone calls and other threatening calls are criminal acts in most jurisdictions, particularly when hate crime is involved. Unsolicited calls may also be used to initiate telephone frauds. Fax machines may also receive junk faxes via unsolicited calls.