3 Definitions, symbols and abbreviations

22.1733GPPIP Multimedia Core Network Subsystem (IMS) Multimedia Telephony Service and supplementary servicesRelease 17Stage 1TS

3.1 Definitions

Caller Identity Analytics function: A verification function that analyzes a large set of traffic data to identify fraud and caller identity spoofing trends and make risk recommendations about the originating telephone number based on trend analysis.

Block list: List of identities or identity ranges that, for one reason or another, are being denied a particular service.

Spoofed call: A call where caller identity creation, modification or removal in call signalling results in an unauthorized or illegal use of this identity in the call., This typically occurs where the caller intends to defraud the called user or otherwise illegally obscure the real caller identity.

Allow list: List of identities or identity ranges that are provided particular services. Allow list is also named VIP list.

3.2 Symbols


3.3 Abbreviations

For the purposes of the present document, the abbreviations given in TR 21.905 [1] and the following apply. An abbreviation defined in the present document takes precedence over the definition of the same abbreviation, if any, in TR 21.905 [1].

3PTY Three Party

ACR Anonymous Communication Rejection

AOC-C Advice Of Charge – Charging

AOC-D Advice Of Charge – During the communication

AOC-E Advice Of Charge – at the End of the communication

AOC-I Advice Of Charge – Information

AOC-S Advice Of Charge – charging information at communication Set-up time

CAT Customized Alerting Tone

CB Communication session Barring

CCBS Completion of Communication sessions to Busy Subscriber

CD Communication Deflection

CDIV Communication DIVersion

CFB Communication Forwarding Busy

CFNL Communication Forwarding on Not Logged-in

CFNR Communication Forwarding No Reply

CFNRc Communication Forwarding on Subscriber Not Reachable

CFU Communication Forwarding Unconditional

COLP COnnected Line identification Presentation

COLR COnnected Line identification Restriction


CRS Customized Ringing Signal

CS Circuit Switched

CUG Closed User Group

CW Communication Waiting

eCNAM Enhanced Calling Name

ECT Explicit Communication Transfer

FA Flexible Alerting

HOLD Communication HOLD

ICB Incoming Communications Barring

MCID Malicious Communication IDentification

MWI Message Waiting Indication

OCB Outgoing Communications Barring

OIP Originating Identification Presentation

OIR Originating Identification Restriction

PSAP Public Safety Answer Point

PUI Public User Identity

SHAKEN Signature-based Handling of Asserted information using toKENs

STIR Secure Telephone Identity Revisited

TIP Terminating Identification Presentation

TIR Terminating Identification Restriction