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


ACRONYMFull NameDefinition
3GPP 3rd Generation Partnership ProjectDefinition
ACR Anonymous Call RejectionDefinition
AMBR Aggregate Maximum Bit RateDefinition
AMR Adaptive Multi-RateDefinition
AMR-WB Adaptive Multi-Rate WidebandDefinition
API Application Programming InterfaceDefinition
APN Access Point NameDefinition
AS Application ServerDefinition
AS-ILCM Application Server Incoming Leg Control ModelDefinition
AS-OLCM Application Server Outgoing Leg Control ModelDefinition
AUTN Authentication TokenDefinition
AVP Attribute Value PairDefinition
B2BUA Back-to-Back User AgentDefinition
BCSM Basic Call State ModelDefinition
BICC Bearer Independent Call ControlDefinition
BS Bearer ServiceDefinition
CAMEL Customized Application Mobile Enhanced LogicDefinition
CAP CAMEL Application PartDefinition
CDR Charging Data RecordDefinition
CN Core NetworkDefinition
CPL Call Processing LanguageDefinition
CS Circuit SwitchedDefinition
CSE CAMEL Service EnvironmentDefinition
DHCP Dynamic Host Configuration ProtocolDefinition
DNS Domain Name SystemDefinition
DSCP Differentiated Services Code PointDefinition
EAP Extensible Authentication ProtocolDefinition
ECN Explicit Congestion NotificationDefinition
ENUM E.164 Number MappingDefinition
EPC Evolved Packet CoreDefinition
EPS Evolved Packet SystemDefinition
ETSI European Telecommunications Standards InstituteDefinition
E-UTRAN Evolved UTRANDefinition
FDD Frequency Division DuplexDefinition
GSM Global System for Mobile communicationsDefinition
GTP GPRS Tunneling ProtocolDefinition
GUP Generic User ProfileDefinition
HPLMN Home Public Definition
HPMN Home Public Mobile NetworkDefinition
HSPA High Speed Packet AccessDefinition
HSS Home Subscriber ServerDefinition
HTTP Hypertext Transfer ProtocolDefinition
IBCF Interconnection Border Control FunctionDefinition
ICID IMS Charging IDDefinition
I-CSCF Interrogating Call Session Control FunctionDefinition
ICSI IMS Communication Service IdentifierDefinition
IETF Internet Engineering Task ForceDefinition
II-NNI Inter-IMS Network to Network InterfaceDefinition
IM Instant MessagingDefinition
IMC IMS CredentialsDefinition
IMEI International Mobile Station Equipment IdentityDefinition
IMS IP Multimedia SubsystemDefinition
IMS-AKA IMS Authentication and Key AgreementDefinition
IMSI International Mobile Subscriber IdentityDefinition
IN Intelligent NetworkDefinition
IOI Inter Operator IdentifierDefinition
IP Internet ProtocolDefinition
IP CAN IP-Connectivity Access NetworkDefinition
IPsec IP SecurityDefinition
IPv4 Internet Protocol version 4Definition
IPv6 Internet Protocol version 6Definition
IPX IP Packet ExchangeDefinition
I-SBC Interconnect Session Border ControllerDefinition
ISC IP multimedia Service ControlDefinition
ISDN Integrated Services Digital NetworkDefinition
ISIM IM Services Identity ModuleDefinition
ISP Internet Service ProviderDefinition
ISUP ISDN User PartDefinition
ITS IP Transport SubsystemDefinition
LBO Local BreakoutDefinition
LTE Long Term EvolutionDefinition
MAC Medium Access ControlDefinition
MAP Mobile Application PartDefinition
MBMS Multimedia Broadcast/Multicast ServiceDefinition
MCC Mobile Country CodeDefinition
ME Mobile EquipmentDefinition
MIMO Multiple Input Multiple OutputDefinition
MISO Multiple Input Single OutputDefinition
MMS Multimedia Messaging ServiceDefinition
MN Mobile NetworkDefinition
MNO Mobile Network OperatorDefinition
MO Mobile OriginatingDefinition
MS Mobile StationDefinition
MSISDN Mobile Station International ISDN NumberDefinition
MT Mobile TerminatingDefinition
MTU Maximum Transmission UnitDefinition
NAI Network Access IdentifierDefinition
NAPT Network Address Port TranslationDefinition
NAS Non-Access StratumDefinition
NAT Network Address TranslationDefinition
NNI Network to Network InterfaceDefinition
NP Number portabilityDefinition
OSA Open Services ArchitectureDefinition
PCC Policy and Charging ControlDefinition
PDN Packet Data NetworkDefinition
PDP Packet Data Protocol e.g., IPDefinition
P‑GRUU Public Globally Routable User Agent URIDefinition
PLMN Public Land Mobile NetworkDefinition
PMN Private Mobile NetworkDefinition
PS Packet SwitchedDefinition
PSI Public Service IdentityDefinition
PSTN Public Switched Telephone NetworkDefinition
P-TMSI Packet Temporary Mobile Subscriber IdentityDefinition
QCI QoS Class IdentifierDefinition
QoS Quality of ServiceDefinition
RADIUS Remote Authentication Dial-In User ServiceDefinition
RAN Radio Access NetworkDefinition
RAT Radio Access TechnologyDefinition
RTCP RTP Control ProtocolDefinition
RTP Real-time Transport ProtocolDefinition
SAE System Architecture EvolutionDefinition
SBC Session Border ControllerDefinition
SCCP Signaling Connection Control PartDefinition
SCIM Service Capability Interaction ManagerDefinition
SCTP Stream Control Transmission ProtocolDefinition
SDP Session Description ProtocolDefinition
SIM Subscriber Identity ModuleDefinition
SIP Session Initiation ProtocolDefinition
SIP-I SIP with encapsulated ISUPDefinition
SMS Short Message ServiceDefinition
SRTP Secure RTPDefinition
SS7 Signaling System 7Definition
SSF Service Switching FunctionDefinition
STP Service Platform Trigger PointsDefinition
TAS Telephony Application ServerDefinition
TCP Transmission Control ProtocolDefinition
TDD Time Division DuplexDefinition
TDM Time Division MultiplexingDefinition
T‑GRUU Temporary Globally Routable User Agent URIDefinition
TLS Transport Layer SecurityDefinition
TMSI Temporary Mobile Subscriber IdentityDefinition
UA User AgentDefinition
UDP User Datagram ProtocolDefinition
UE User EquipmentDefinition
UMTS Universal Mobile Telecommunications SystemDefinition
URI Uniform Resource IdentifierDefinition
URL Uniform Resource LocatorDefinition
USIM Universal Subscriber Identity ModuleDefinition
ViLTE Video over LTEDefinition
VLR Visitor Location RegisterDefinition
VoLTE Voice over LTEDefinition
VPMN Visited Public Mobile NetworkDefinition
XCAP XML Configuration Access ProtocolDefinition
XML Extensible Markup LanguageDefinition