IMS VoLTE and 3GPP Acronyms

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Next generation networks utilize an exhaustive list of architectural components that need to work seamlessly to enable end-to-end services for customers that demand connectivity and content at any-time, any-place and on any device.

Industry organizations such as the 3GPP, ETSI, IETF, ITU, GSMA, WBA and several others have gone to great length in specifying architectural reference models, naming conventions and interface functionality. The following is a list of select interfaces, network nodes and acronyms to better navigate the technical aspects of modern service delivery networks.

Nodes | Acronyms


3GPP 3rd Generation Partnership Project
ACR Anonymous Call Rejection
AMBR Aggregate Maximum Bit Rate
AMR Adaptive Multi-Rate
AMR-WB Adaptive Multi-Rate Wideband
API Application Programming Interface
APN Access Point Name
AS Application Server
AS-ILCM Application Server Incoming Leg Control Model
AS-OLCM Application Server Outgoing Leg Control Model
AUTN Authentication Token
AVP Attribute Value Pair
B2BUA Back-to-Back User Agent
BCSM Basic Call State Model
BICC Bearer Independent Call Control
BS Bearer Service
CAMEL Customized Application Mobile Enhanced Logic
CAP CAMEL Application Part
CDR Charging Data Record
CN Core Network
CPL Call Processing Language
CS Circuit Switched
CSE CAMEL Service Environment
DHCP Dynamic Host Configuration Protocol
DNS Domain Name System
DSCP Differentiated Services Code Point
EAP Extensible Authentication Protocol
ECN Explicit Congestion Notification
ENUM E.164 Number Mapping
EPC Evolved Packet Core
EPS Evolved Packet System
ETSI European Telecommunications Standards Institute
FDD Frequency Division Duplex
GSM Global System for Mobile communications
GTP GPRS Tunneling Protocol
GUP Generic User Profile
HPLMN Home Public
HPMN Home Public Mobile Network
HSPA High Speed Packet Access
HSS Home Subscriber Server
HTTP Hypertext Transfer Protocol
IBCF Interconnection Border Control Function
ICID IMS Charging ID
I-CSCF Interrogating Call Session Control Function
ICSI IMS Communication Service Identifier
IETF Internet Engineering Task Force
II-NNI Inter-IMS Network to Network Interface
IM IP Multimedia
IMC IMS Credentials
IMEI International Mobile Station Equipment Identity
IMS IP Multimedia Subsystem
IMS-AKA IMS Authentication and Key Agreement
IMSI International Mobile Subscriber Identity
IN Intelligent Network
IOI Inter Operator Identifier
IP Internet Protocol
IP CAN IP-Connectivity Access Network
IPsec IP Security
IPv4 Internet Protocol version 4
IPv6 Internet Protocol version 6
IPX IP Packet Exchange
I-SBC Interconnect Session Border Controller
ISC IP multimedia Service Control
ISDN Integrated Services Digital Network
ISIM IM Services Identity Module
ISP Internet Service Provider
ITS IP Transport Subsystem
LBO Local Breakout
LTE Long Term Evolution
MAC Medium Access Control
MAP Mobile Application Part
MBMS Multimedia Broadcast/Multicast Service
MCC Mobile Country Code
ME Mobile Equipment
MIMO Multiple Input Multiple Output
MISO Multiple Input Single Output
MMS Multimedia Messaging Service
MN Mobile Network
MNO Mobile Network Operator
MO Mobile Originating
MS Mobile Station
MSISDN Mobile Station International ISDN Number
MT Mobile Terminating
MTU Maximum Transmission Unit
NAI Network Access Identifier
NAPT Network Address Port Translation
NA(P)T-PT Network Address Network Address (Port-Multiplexing) Translation-Protocol Translation
NAS Non-Access Stratum
NAT Network Address Translation
NNI Network to Network Interface
NP Number portability
OSA Open Services Architecture
PCC Policy and Charging Control
PDN Packet Data Network
PDP Packet Data Protocol e.g., IP
P‑GRUU Public Globally Routable User Agent URI
PLMN Public Land Mobile Network
PMN Public Mobile Network
PS Packet Switched
PSI Public Service Identity
PSTN Public Switched Telephone Network
P-TMSI Packet Temporary Mobile Subscriber Identity
QCI QoS Class Identifier
QoS Quality of Service
RADIUS Remote Authentication Dial-In User Service
RAN Radio Access Network
RAT Radio Access Technology
RTCP RTP Control Protocol
RTP Real-time Transport Protocol
SAE System Architecture Evolution
SBC Session Border Controller
SCCP Signaling Connection Control Part
SCIM Service Capability Interaction Manager
SCTP Stream Control Transmission Protocol
SDP Session Description Protocol
SIM Subscriber Identity Module
SIP Session Initiation Protocol
SIP-I SIP with encapsulated ISUP
SMS Short Message Service
SS7 Signaling System 7
SSF Service Switching Function
STP Service platform Trigger Points
TAS Telephony Application Server
TCP Transmission Control Protocol
TDD Time Division Duplex
TDM Time Division Multiplexing
T‑GRUU Temporary Globally Routable User Agent URI
T GRUU Temporary Globally Routable User Agent URI
TLS Transport Layer Security
TMSI Temporary Mobile Subscriber Identity
UA User Agent
UDP User Datagram Protocol
UE User Equipment
UMTS Universal Mobile Telecommunications System
URI Uniform Resource Identifier
URL Uniform Resource Locator
USIM Universal Subscriber Identity Module
ViLTE Video over LTE
VLR Visitor Location Register
VoLTE Voice over LTE
VPMN Visited Public Mobile Network
XCAP XML Configuration Access Protocol
XML Extensible Markup Language