Nuisance call

telephone harassmentcallsnuisance callsnuisance phone calls
Nuisance calls encompass any type of unwanted, unsolicited, telephone call.wikipedia
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Prank call

prank callsprank phone callsprank phone call
Common types of nuisance calls include prank calls, telemarketing calls, and silent calls.
It is often a type of nuisance call.

Telemarketing

telemarketertelemarketerstelesales
Common types of nuisance calls include prank calls, telemarketing calls, and silent calls.
Nuisance call

Telephone call

callphone callphone calls
Nuisance calls encompass any type of unwanted, unsolicited, telephone call.

Silent call

silent telephone calls
Common types of nuisance calls include prank calls, telemarketing calls, and silent calls.

Obscene phone call

Telephone scatologialewd phone callsobscene telephone calls
Obscene phone calls and other threatening calls are criminal acts in most jurisdictions, particularly when hate crime is involved.

Hate crime

hate crimesracially motivatedbias-motivated crime
Obscene phone calls and other threatening calls are criminal acts in most jurisdictions, particularly when hate crime is involved.

Phone fraud

telephone fraudtoll fraudcramming
Unsolicited calls may also be used to initiate telephone frauds.

Fax

fax machinefacsimilefax machines
Fax machines may also receive junk faxes via unsolicited calls.

Junk fax

blastfaxing junk fax transmissionsfaxes
Fax machines may also receive junk faxes via unsolicited calls.

Caller ID

caller line identificationCLIcall display
Caller ID provides some protection against unwanted calls, but can still be turned off by the calling party.

Automatic number identification

ANIautomatic number identification (ANI)the caller's number
Even where end-user Caller ID is not available, calls are still logged, both in billing records at the originating telco and via automatic number identification, so the perpetrator's phone number can still be discovered in many cases.

Caller ID spoofing

spoofspoofeda false origin is displayed
However, these do not provide complete protection: harassers can use payphones and, in some cases, caller ID (but not necessarily automatic number identification itself) can be spoofed or blocked.

Voice over IP

VoIPvoice over Internet Protocolvoice-over-IP
Voice over IP users may send bogus caller ID or route calls through servers in multiple countries.

Call screening

screening callsCall screenerscreen her phone calls
Call screening is another countermeasure against unsolicited calls.

Ofcom

Radio AuthorityOffice of CommunicationsOffice of Communications (Ofcom)
In the United Kingdom the communication regulator Ofcom offers a service to report on silent calls while the Telephone Preference Service (TPS) allows consumer to register on a do-not-call-list for marketing calls.

Telephone Preference Service

In the United Kingdom the communication regulator Ofcom offers a service to report on silent calls while the Telephone Preference Service (TPS) allows consumer to register on a do-not-call-list for marketing calls.

Canadian Radio-television and Telecommunications Commission

CRTCCanadian Radio-Television CommissionCanadian Radio-television and Telecommunications Commission (CRTC)
On December 19, 2018, the Canadian Radio-television and Telecommunications Commission (CRTC) announced that beginning December 19, 2019, phone providers will be required to impose universal, network-level filtering of all calls that "[purport] to originate from telephone numbers that do not conform to established numbering plans".

2002 New Hampshire Senate election phone jamming scandal

James Tobin2002 NH phone jamming scandaljamming Democratic Party lines
Verizon was later able to stop most of these calls, but whoever had made them had violated state laws against telephone harassment.

Digital Economy Act 2017

obsolete'.Digital Economy ActDigital Economy Act (2017)
Providing for increased penalties for nuisance calls.

Tsutomu Miyazaki

Saitama serial kidnapping murders of young girls
Police found that the families of the victims had something else in common: all received silent nuisance phone calls.