For the purposes of the present document, the following abbreviations apply:
AAA
Authentication, Authorization, and Accounting
API
Application Programming Interface
AS
Application Server
AS-ILCM
Application Server Incoming Leg Control Model
AS-OLCM
Application Server Outgoing Leg Control Model
B2BUA
Back-to-Back User Agent
CAMEL
Customized Applications for Mobile network Enhanced Logic
CAP
CAMEL Application Part
CCF
Charging Collection Function
CDR
Charging Data Records
CF
Call Forwarding
CFonCLI
Call Forwarding on Calling Line Identification
CGI
Common Gateway Interface
CPL
Call Processing Language
CLI
Calling Line Identification
CSCF
Call Session Control Function
CSE
CAMEL Service Environment
ECF
Event Charging Function
FC
Filter Criteria
GPRS
General Packet Radio Service
GPRS CID
GPRS Charging IDentifiers
GRUU
Globally Routable User agent URI
gsmSCF
gsm Service Control Function
HPLMN
Home PLMN
HSS
Home Subscriber Server
IETF
Internet Engineering Task Force
I-CSCF
Interrogating CSCF
IARI
IMS Application Reference Identifier
ICID
IMS Charging ID
ICSI
IMS Communication Service Identifier
iFC
Initial Filter Criteria
ILCM
Incoming Leg Control Model
IM
IP Multimedia
IM-CSI
IP Multimedia CAMEL Subscription Information
IMS
IP Multimedia Subsystem
IMSI
International Mobile Subscriber Identity
IM-SSF
IP Multimedia Service Switching Function
IOI
Inter Operator Identifier
IP
Internet Protocol
ISC
IP multimedia Service Control
MAP
Mobile Application Part
MGCF
Media Gateway Control Function
MRFC
Multimedia Resource Function Controller
MRFP
Multimedia Resource Function Processor
O-IM-CSI
Originating IP Multimedia CAMEL Subscription Information
ODI
Original Dialog Identifier
OLCM
Outgoing Leg Control Model
OSA
Open Service Access
PLMN
Public Land Mobile Network
P-CSCF
Proxy CSCF
RFC
Request For Comments
SCF
Session Charging Function
SCIM
Service Capability Interaction Manager
SCS
Service Capability Server
SDP
Session Description Protocol
sFC
Subsequent Filter Criteria
SIP
Session Initiation Protocol
S-CSCF
Serving CSCF
SPT
Service Point Trigger
STP
Service platform Trigger Points
T-IM-CSI
Terminating IP Multimedia CAMEL Subscription Information
UA
User Agent
UE
User Equipment
URL
Uniform Resource Locator
XML
EXtensible Markup Language
MRB
Media Resource Broker
IVR
Interactive Voice Response