Malicious caller identification

Malicious caller identification, activated by Vertical service code Star codes *57, is an upcharge fee subscription service offered by telephone company providers which, when dialed immediately after a malicious call, records meta-data for police follow-up.wikipedia
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Vertical service code

calling featureservice featureCLASS
Malicious caller identification, activated by Vertical service code Star codes *57, is an upcharge fee subscription service offered by telephone company providers which, when dialed immediately after a malicious call, records meta-data for police follow-up. How the user activates this feature depends on their phone system — generally it is either in-band-signaling DTMF sequence such as the *57 Vertical service code or a special button attached to their phone generating an out-of-band signal.

Unlisted number

unlistedUnlisted telephone numberex-directory
The call trace is not dependent upon call duration (as envisioned in dramatic movie plots) and will record all meta-data regardless of source conditions - even if the call was made from an unlisted number, a payphone or a number with caller identification disabled.

Payphone

pay phonepayphonespublic telephone
The call trace is not dependent upon call duration (as envisioned in dramatic movie plots) and will record all meta-data regardless of source conditions - even if the call was made from an unlisted number, a payphone or a number with caller identification disabled.

Dual-tone multi-frequency signaling

DTMFtouch-tonetouch tone
How the user activates this feature depends on their phone system — generally it is either in-band-signaling DTMF sequence such as the *57 Vertical service code or a special button attached to their phone generating an out-of-band signal.

Plain old telephone service

POTSLocal Telephone Servicetelephone
For analogue services, many exchanges will interpret DTMF sequences to activate POTS.

Integrated Services Digital Network

ISDN ISDNISDN30
Digital services, such as ISDN or GSM, enable the CPE to activate MCI via out-of-band signaling.

GSM

GSM (850/900/1800/1900) GSM/GPRS/EDGEGSM technology
Digital services, such as ISDN or GSM, enable the CPE to activate MCI via out-of-band signaling.

Customer-premises equipment

customer premises equipmentCPEcustomer premises
Digital services, such as ISDN or GSM, enable the CPE to activate MCI via out-of-band signaling.

Business telephone system

PBXprivate branch exchangekey telephone system
Often with PABXs with analogue phone connections, the PABX will interpret the DTMF and then activate the out-of-band signaling.

ETSI

European Telecommunications Standards InstituteEuropean Telecommunications Standards Institute (ETSI)ETS
MCI is the ETSI standard, whereas MCT is the American one.

Signalling System No. 7

SS7SS7 NetworkCCS7
Some of the first such services were call management related, call forwarding (busy and no answer), voice mail, call waiting, conference calling, calling name and number display, call screening, malicious caller identification, busy callback.

MCI

Malicious caller identification, a type of enhanced telephone service

Prank call

prank callsprank phone callsprank phone call
Malicious Caller Identification