| 2G |
2nd Generation of Global System for Mobile Communications (GSM) |
| ACK |
Acknowledgement |
| ACL |
Access Control List |
| ADSL |
Asymmetric Digital Subscriber Line |
| ALG |
Application Layer Gateway |
| AMR |
Adaptive Multi-Rate |
| APN |
Access Point Name |
| AP |
Authentication Proxy |
| API |
Application Programming Interface |
| AS |
Application Server |
| ASAP |
As Soon As Possible |
| ASO |
Arbitrary Slice Ordering |
| AuC |
Authentication Centre |
| AVC |
Advanced Video Codec |
| BA |
Broadband Access |
| B2BUA |
Back-to-Back User Agent |
| bool |
Boolean |
| BP |
Baseline Profile |
| BPEF |
Blacklist Policy Enforcement Function |
| bps |
Bits per second (used with Mbps: Mega-, kbps: kilo-) |
| BSF |
Bootstrapped Security Function |
| B-TID |
Bootstrapping Transaction Identifier |
| CA |
Certification Authority |
| CAB |
Converged Address Book |
| CBP |
Constrained Baseline Profile |
| CCW |
Counter-Clockwise |
| CPIM |
Common Profile for Instant Messaging |
| CPM |
Converged IP Messaging |
| CRLF |
Carriage Return Line Feed |
| CS |
Circuit Switched |
| CSFB |
Circuit Switched FallBack |
| CVO |
Coordination of Video Orientation |
| CW |
Clockwise |
| DNS |
Domain Name System |
| DNS SRV |
Domain Name System Service record |
| DRX |
Discontinuous Reception |
| DTM |
Dual Transfer Mode |
| DTX |
Discontinuous Transmission |
| e2ae |
end-to-access edge |
| e2e |
end-to-end |
| EAB |
Enhanced Address Book |
| eIMS-AGW |
Enhanced IP Multimedia Subsystem-Access GateWay |
| EOF |
End Of File |
| eP-CSCF |
Enhanced Proxy-Call Session Control Function |
| EPSG |
European Petroleum Survey Group |
| EUCR |
End User Confirmation Request |
| Extension |
Piece of software (e.g. add-on, app, etc.) installed on top of an RCS Client that makes use of the RCS infrastructure to change or enhance the user experience or bring extra functionality to the service via the existing or via a new, separate user interface. |
| FIFO |
First IN First Out |
| FIR |
Full Intra Request |
| FMO |
Flexible Macroblock Ordering |
| FQDN |
Fully Qualified Domain Name |
| FTF |
File Transfer Function |
| FTTH |
Fibre To The Home |
| GAA |
Generic Authentication Architecture |
| GBA |
Generic Bootstrapping Architecture |
| GBR |
Guaranteed Bitrate |
| GGSN |
Gateway General Packet Radio Service Support Node |
| GIF |
Graphics Interchange Format |
| GML |
Geography Markup Language |
| GMLC |
Gateway Mobile Location Centre |
| GPRS |
General Packet Radio Service |
| GPS |
Global Positioning System |
| Group Chat ID |
Identifier of a Group Chat. For OMA CPM, it is the Contribution-ID and the Conversation-ID. For OMA SIMPLE IM, it is the Contribution-ID |
| GRUU |
Globally Routable User agent URI |
| GSM |
Global System for Mobile Communications |
| GSMA |
GSM Association |
| GSO |
Group State Object |
| HOS |
Home Operator Services |
| HPLMN |
Home Public Land Mobile Network |
| HSPA |
High Speed Packet Access |
| HSS |
Home Subscriber Server |
| HTTP |
Hyper-Text Transfer Protocol |
| HTTPS |
Hyper-Text Transfer Protocol Secure |
| HW |
HardWare |
| IARI |
IMS Application Reference Identifier |
| I-CSCF |
Interworking Call Session Control Function |
| ICSI |
IMS Communication Service Identifier |
| ID |
IDentifier |
| IEI |
Information Element Identifier |
| IETF |
Internet Engineering Task Force |
| IM |
Instant Messaging. The term chat is also applied in this document to the same concept. |
| IMAP |
Internet Message Access Protocol |
| IM-AS |
Instant Messaging Application Server NOTE: This equivalent terminology for Messaging Server is used in some of the figures |
| IMDN |
Instant Message Disposition Notification |
| IMEI |
International Mobile Station Equipment Identity |
| IMPI |
Internet Protocol Multimedia Subsystem Private Identity |
| IMPU |
Internet Protocol Multimedia Subsystem PUblic identity |
| IMS |
Internet Protocol Multimedia Subsystem |
| IMSI |
International Mobile Subscriber Identity |
| IMS AKA |
IMS Authentication and Key Agreement |
| Int |
Integer |
| IP |
Internet Protocol |
| IPsec |
Internet Protocol Security |
| IP-SM-GW |
Internet Protocol Short Message Gateway |
| IPX |
Internet Protocol Packet eXchange |
| ISIM |
Internet Protocol Multimedia Services SIM |
| ISF |
Interworking Selection Function |
| IWF |
InterWorking Function |
| JPEG |
Joint Photographic Experts Group |
| KB |
KiloByte (i.e. 1024 bytes) |
| kB |
Kilobyte 1 kilobyte = 103bytes = 1000bytes. |
| LBS |
Location Based Services |
| LSB |
Least Significant Bit |
| LTE |
Long Term Evolution |
| MAP |
Mobile Application Part |
| Messaging Server |
A server providing support for the standalone messaging service (see section 3.2) according to [RCS-CPM-CONVFUNC-ENDORS] and/or Chat (see sections 3.3 and 3.4) according to [RCS-SIMPLEIM-ENDORS] or [RCS-CPM- CONVFUNC-ENDORS] |
| MIME |
Multipurpose Internet Mail Extensions |
| MLP |
Mobile Location Protocol |
| MMS |
Multimedia Message Service |
| MMS-C |
Multimedia Messaging Service Centre |
| MMTEL |
MultiMedia TELephony |
| MNO |
Mobile Network Operator |
| MO |
Management Object |
| MO-SMS |
Mobile Originated Short Message Service |
| MPEG |
Moving Pictures Experts Group |
| MSB |
Most Significant Bit |
| MSISDN |
Mobile Subscriber Integrated Services Digital Network Number |
| MSRP |
Message Session Relay Protocol |
| MSRPoTLS |
Message Session Relay Protocol over Transport Layer Security |
| MTU |
Maximum Transmission Unit |
| NAL |
Network Abstraction Layer |
| NAT |
Network Address Translation |
| NGBR |
Non-Guaranteed Bitrate |
| NNI |
Network Network Interface |
| NW |
NetWork |
| OEM |
Original Equipment Manufacturer |
| OMA |
Open Mobile Alliance |
| OMA-CP |
Open Mobile Alliance Client Provisioning |
| OMA-DM |
Open Mobile Alliance Device Management |
| OS |
Operating System |
| PCO |
Protocol Configuration Options |
| P-CSCF |
Proxy-Call Session Control Function |
| PC |
Personal Computer |
| PCC |
Personal Contact Card |
| PDP |
Packet Data Protocol |
| PDF |
Portable Document Format |
| PIDF |
Presence Information Data Format |
| PKI |
Public Key Infrastructure |
| PNB |
Personal Network Blacklist |
| PNG |
Portable Network Graphics |
| POSIX |
Portable Operating System Interface |
| PPS |
Picture Parameter Set |
| PRD |
Permanent Reference Document |
| PS |
Packet Switched |
| PSTN |
Public Switched Telephone Network |
| QCI |
Quality of Service Class Identifier |
| QoS |
Quality of Service |
| RADIUS |
Remote Authentication Dial In User Service |
| RAN |
Radio Access Network |
| RCS |
Rich Communication Suite |
| RCS Group Chat ID |
A globally unique identifier that uniquely identifies a Group Chat and that is created when the group chat is first started and preserved over Group Chat restarts. The Group Chat ID is transported as the Contribution-ID header field in a SIMPLE-IM based communication and as the Conversation-ID header field when the communication is CPM based. |
| RCS User |
An end user that has device or client (and the corresponding Service Provider subscription) supporting the RCS capability exchange framework and at least one of the services defined in the current specification. |
| RFC |
Request For Comments |
| RLC |
Radio Link Control |
| RLS |
Resource List Server |
| RR |
Receiver Report |
| RRAM |
RCS Recorded Audio Message |
| RS |
Redundant Slices |
| RTCP |
Real-time Transport Control Protocol |
| RTP |
Real-time Transport Protocol |
| SBC |
Session Border Controller |
| S-CSCF |
Serving Call Session Control Function |
| SDP |
Session Description Protocol |
| SDES |
Session Description Protocol Security Descriptions for Media Streams |
| SET |
Secure User Plane Location Enabled Terminal |
| SGs interface |
3GPP defined reference point between the Mobility Management Entity and the Mobile Switching Centre |
| SIM |
Subscriber Identity Module |
| SIMPLE |
Session Initiation Protocol for Instant Messaging and Presence Leveraging Extensions |
| SIO |
Session Info Object |
| SIP |
Session Initiation Protocol |
| SIPoTLS |
Session Initiation Protocol over Transport Layer Security |
| SLA |
Service Level Agreement |
| SMPP |
Short Message Peer-to-Peer |
| SMS |
Short Message Service |
| SMS-C |
Short Message Service Centre |
| SMSoIP |
Short Message Service over Internet Protocol |
| SP |
Service Provider |
| SPI |
Social Presence Information |
| SPS |
Sequence Parameter Set |
| SR |
Sender Report |
| SRTP |
Secure Real-time Transport Protocol |
| SR-VCC |
Single Radio Voice Call Continuity |
| SSO |
Single Sign On |
| STAP-A |
Single-Time Aggregation Packet type A |
| STUN |
Simple Traversal of User Datagram Protocol through Network Address Translations |
| SUPL |
Secure User Plane Location |
| SW |
SoftWare |
| TCP |
Transmission Control Protocol |
| tel URI |
telephone Uniform Resource Identifier |
| TID |
Transaction IDentifier |
| TLS |
Transport Layer Security |
| TON |
Type Of Number |
| TPDU |
Transfer Protocol Data Unit |
| TUI |
(Voice Mail) Telephony User Interface |
| UA |
User Agent |
| UC |
Use Case |
| UCS2 |
2-byte Universal Character Set |
| UDH |
User Data Header |
| UDP |
User Datagram Protocol |
| UE |
User Equipment |
| UI |
User Interface |
| UID |
Unique IDentifier |
| UMTS |
Universal Mobile Telecommunications System |
| UNI |
User Network Interface |
| URI |
Uniform Resource Identifier |
| URL |
Uniform Resource Locator |
| USIM |
Universal Subscriber Identity Module |
| UTC |
Coordinated Universal Time |
| UUID |
Universally Unique IDentifier |
| UX |
User Experience |
| vCard |
A format for electronic business cards |
| VIP |
Very Important Person |
| VMS |
Voice Mail System |
| VoIP |
Voice over IP |
| VoLTE |
Voice over Long Term Evolution |
| VoWiFi |
Voice over EPC-integrated Wi-Fi as specified in [PRD-IR.51] |
| VV-Mail |
Visual Voice/Video-Mail |
| VVM |
Visual Voice Mail |
| W-CDMA |
Wideband Code Division Multiple Access |
| WebRTC |
Web Real Time Communication |
| Wi-Fi |
Trademark of Industry Consortium "Wi-Fi Alliance" used as synonym for WLAN (Wireless Local Area Network) |
| WLAN |
Wireless Local Area Network |
| XCAP |
XML Configuration Access Protocol |
| XDM |
XML Document Management |
| XDMC |
XML Document Management Client |
| XDMS |
XML Document Management Server |
| XML |
Extensible Markup Language |
| XSD |
XML Schema Definition |
| xSIM |
Generic reference to different types of SIMs (e.g. USIM, ISIM, etc.) |