3 Definitions and abbreviations

24.3153GPPIP Multimedia Subsystem (IMS) Operator Determined Barring (ODB)Release 17Stage 3: protocol specificationTS

3.1 Definitions

For the purposes of the present document, the terms and definitions given in 3GPP TR 21.905 [1] and the following apply. A term defined in the present document takes precedence over the definition of the same term, if any, in 3GPP TR 21.905 [1].

B2BUA, dialog, header, header field, SIP response, SIP request, session: definitions in IETF RFC 3261 [3] apply.

incoming initial request: all requests intended to initiate either a dialog or a standalone transaction terminated by the served user

incoming communication: communication destined to the served user

indication that this communication is a Premium Rate Communication: the Request-URI of the received INVITE request includes the " premium-rate" tel URI parameter set to either the value "information" or the value "entertainment".

in progress communication: outgoing or incoming communication for which the initiating request has been forwarded to the terminating UE.

outgoing communication: communication outgoing from the user side of the interface

supplementary service: see ITU‑T Recommendation I.210 [5], clause 2.4.

3.2 Abbreviations

For the purposes of the present document, the following abbreviations apply:

AS Application Server

CB Communication Barring

CDIV Communication DIVersion services

ECT Explicit Communication Transfer

HPLMN Home Public Land Mobile Network

HSS Home Subscriber Server

IP Internet Protocol

ODB Operator Determined Barring

SDP Session Description Protocol

SIP Session Initiation Protocol

UE User Equipment