Malicious caller identification
Call trace
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 featureCustom Local Area Signaling Services
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-tonedual-tone multi-frequency
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
Global System for Mobile CommunicationsGSM networkGSM (850/900/1800/1900)
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 exchangePABX
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)Telecommunications in Europe
MCI is the ETSI standard, whereas MCT is the American one.
Signalling System No. 7
SS7Signaling System 7Signalling System 7
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.
Prank call
prank callsprank phone callsprank phone call