* 3G - Third Generation
* 3GPP, 3GPP2 - Third Generation Partnership Project, Project 2
* AAA - Authentication, Authorization and Accounting
* AAL - ATM Adaptation Layer
* ACD - Automatic Call Distribution
* ACTS - Automated Coin Toll Service
* ADPCM - Adaptive Differential Pulse Code Modulation
* AG - Access Gateway
* AH - Authentication Header
* AIN - Advanced Intelligent Network
* AIS - Alarm Indication Signaling
* AIX - Advanced Interactive Executive
* ALCAP - Access Link Control Application Protocol
* AMR - Adaptive Multi-Rate
* ANDSF - Access Network Discovery and Selection Function
* ANSI - American National Standards Institute
* AP - Application Part
* API - Application Programming Interface
* APP - Application Marker
* APS - Automatic Protection Switching
* ARP - Address Resolution Protocol
* AS - Application Server
* ASN-1 - Abstract Syntax Notation One Encoder / Decoder
* ASP - Application Service Provider
* ASR - Audio Response System
* ATCA - Advanced Telecommunications Computing Architecture
* ATM - Asynchronous Transfer Mode
* ATMARP - Asynchronous Transfer Mode Address Resolution Protocol
* AuC - Authentication Center
* B-ISUP - Broadband ISDN User Part
* B2BUA - Back-to-Back User Agent
* BDP - Business Decision Point
* BGCF - Breakout Gateway Control Function
* BICC - Bearer Independent Call Control
* BM-SC - Broadcast / Multicast Service Center
* BMC - Broadcast Multicast Control
* BOOTP - Bootstrap Protocol
* BRAS/MSS - Broadband Remote Access Switch / Multi Service Switch
* BS - Base Station
* BSC - Base Station Controller
* BSS - Base Station System
* BSSAP - Base Station System Application Part
* BSSGP - Base Station Subsystem GPRS Protocol
* BTS - Base Transceiver System
* BTSM - BTS Management
* CALA - Caribbean and Latin America
* CAMEL - Customized Applications for Mobile Networks Enhanced Logic
* CAN - Connectivity Access Network
* CAP - CAMEL Application Part
* CAPEX - Capital Expenditure
* CBC - Cell Broadcast Center
* CBN - Common Bonding Network
* CC - Call Control, Connection Confirm
* CCF - Charging Control Function
* CCPU - Continuous Computing
* CD-ROM - Compact Disc Read-Only Memory
* CDMA - Code Division Multiple Access
* CDVT - Cell Delay Variation Tolerance
* CFR - Code of Federal Regulations
* CGF - Charging Gateway Function
* CGW - Charging Gateway
* CID - Channel Identifier
* CISPR - Comite International Spécial des Peturbations Radioélectriques (or International Special Committee on Radio Interference)
* CLEI - Common Language Equipment Identifier
* CLI - Command Line Interface
* CLIP - Classical IP
* CM - Connection Manager
* CN - Core Network
* COPS - Common Open Policy Service
* COPS-PR - COPS Policy Provisioning
* CORBA - Common Object Request Broker Architecture
* COTS - Commercial Off-The-Shelf
* CP-TA - Communications Platforms Trade Association
* CPU - Central Processing Unit
* CRF - Charging Rules Function
* CS - Circuit Switched
* CS2K - Communication Server 2000
* CSA - Canadian Standards Association
* CSCF - Call Session Control Function
* CSE - CAMEL Service Environment
* CSU - Computer Switching Unit
* CSV - Comma Separated Values
* DAT - Digital Audio Tape
* DES - Diagnostic Error Signaling
* DFT/HA - Distributed Fault-Tolerant / High Availability
* DFT - Distributed Fault-Tolerant
* DHCP - Dynamic Host Configuration Protocol
* Diameter - Signaling protocol for AAA functions in IMS networks
* DiffServ - Differentiated Services
* DL - Data Link, Down Link
* DLT - Digital Linear Tape
* DNS - Domain Name System
* DPI - Deep Packet Inspection
* DPM - Downtime Performance Measurement
* DS-0 - Digital Signal Zero (64Kbps)
* DS-1 - Digital Signal One (1.544Mbps)
* DS-3 - Digital Signal Three (44.7Mbps)
* DS - Differentiated Services
* DSCP - Dynamic Subnet Configuration Protocol
* DSL - Digital Subscriber Line
* DSLAM - Digital Subscriber Line Access Multiplexer
* DSMIP - Dual Stack Mobile IP
* DSP - Digital Signal Processing
* DSU - Digital Switching Unit
* DTMF - Dual Tone Multi-Frequency
* DVD - Digital Video Disk
* DVMRP - Distance Vector Multicast Routing Protocol
* E1 - European Format Digital Signal Level 1
* EADPCM - Embedded Adaptive Differential Pulse Code Modulation
* EAP - Extensible Authentication Protocol
* eBM-SC - Enhanced Broadcast / Multicast Service Center
* eBS - Evolved Base Station
* ECF - Event Charging Function
* ECMP - Equal Cost Multi-Path
* EIA - Electronic Industries Association
* EIR - Equipment Identification Register
* EM - Element Manager
* EMC - Electromagnetic Compatibility
* EMS - Element Management System
* EN - European Norm
* eNb - E-UTRAN NodeB
* ENUM - Telephone Number Mapping
* EPC - Evolved Packet Core
* EPS - Evolved Packet System
* ePDG - Enhanced Packet Data Gateway
* ESI - End System Identifier
* ESP - Encapsulating Security Payload
* ETS - European Telecommunication Standard
* ETSI - European Telecommunications Standards Institute
* E-UTRAN - Evolved UTRAN
* F1 - F1 Class of OAM
* F3 - Virtual Path OAM
* F5 OAM - Virtual Circuit OAM
* FA - Foreign Agent
* FAP - Femto Access Point
* FCC - Federal Communications Commission
* FGW - Femto Gateway
* FITs - Failures per Billion Hours of Operation
* FMECA - Fault Modes, Effects and Criticality Analysis
* FP - Framing Protocol
* FR - Frame Relay
* FRU - Field Replaceable Unit
* FT/HA - Fault-Tolerant / High Availability
* FTP - File Transfer Protocol
* FTTx - Fiber to the curb / home / premises
* GAN - Generic Access Network
* GANC - Generic Access Network Controller
* GbE - Gigabit Ethernet
* GERAN - GSM Edge Radio Access Network
* GGSN - Gateway GPRS Support Node
* GK - Gatekeeper
* GMLC - Gateway Mobile Location Center
* GMM/SM - GPRS Mobility Management and Session Management
* GMSC - Gateway MSC
* GPRS - General Packet Radio System
* GPS - Global Positioning System
* GRE - Generic Routing Encapsulation
* GSM - Global System for Mobile Communications
* GSN - GPRS Support Node
* GSP - Global Service Provider
* GTP - GPRS Tunneling Protocol
* GTT - Global Title Translation
* GUI - Graphical User Interface
* GW - Gateway
* H.248 - MEGACO, Media Gateway Control Protocol
* H.323 - Umbrella protocol for H.255.0, H.245, H.450
* HA - High Availability
* H-AAA - Home AAA
* HDLC - High-level Data Link Control
* HDTV - High Definition Television
* HLR - Home Location Register
* HNB - Home NodeB
* HSS - Home Subscriber Server
* I-CSCF - Interrogating Call Session Control Function
* i-SCSI - Internet Small Computer Systems Interface
* I/F - Interface
* I/O - Input / Output
* IA - Intel Architecture
* IAD - Integrated Access Device
* IBN - Isolated Bonding Network
* ICMP - Internet Control Message Protocol
* IEC - Inter Exchange Carrier
* IEEE - Institute of Electrical and Electronics Engineers
* IETF - Internet Engineering Task Force
* IGMP - Internet Group Management Protocol
* IKE - Internet Key Exchange
* ILMI - Integrated Local Management Interface
* IM - Instant Messaging
* IM-SSF - IP Multimedia - Service Switching Function
* IME - Interface Management Entity
* IMS - IP Multimedia Subsystem
* IMS-MGW - IP Multimedia Subsystem Media Gateway Function
* IN - Intelligent Network
* INAP - Intelligent Network Application Protocol
* InATMARP - Inverse ATMARP
* IOS - Inter-Operability Specifications
* IP - Internet Protocol
* IP PBX - Internet Protocol Private Branch Exchange
* IP-SP - IP-Signaling Point
* IPBCP - IP Bearer Control Protocol
* IPoA - IP over ATM
* IPsec - IP Security
* IPT - Integrated Project Team
* IPTV - IP Television
* IRIG-B - Inter Range Instrumentation Group mod B
* ISC - IMS Service Control
* ISDN - Integrated Services Digital Network
* ISG - Intelligent Services Gateway
* ISO/IEC - International Organization of Standardization / International - Electrotechnical Commission
* ISUP - ISDN User Part
* ITU-T - International Telecommunications Union Telecom sector
* IUA - ISDN Q.921 User Adaptation Layer
* IVR - Interactive Voice Response
* IWGW - Interworking Gateway
* IWMSC - Interworking MSC
* JFS - Journaling File System
* JTAG - Joint Test Action Group
* KVM - Keyboard Video Mouse
* L1 - Layer 1 in OSI Model (Physical Layer)
* L2 - Layer 2 in OSI Model (Data Link layer)
* L2F - Layer 2 Forwarding
* L2TP - Layer 2 Tunneling Protocol
* LAN - Local Area Network
* LAPB - Link Access Procedure Balanced
* LAPC - Link Access Procedure for Control Plane
* LAPD - Link Access Protocol on D channel
* LAPDm - LAPD Mobility
* LAPV5 DL - Link Access Protocol V5 Data Link
* LAPV5 EF - Link Access Protocol V5 Envelope Function
* LB - Load Balancing
* LBS - Location-Based Services
* LCS - Location Services
* LDAP - Lightweight Directory Access Protocol
* LDF - Load Distribution Function
* LE - Local Exchange
* LL - Local Loop
* LLC - Logical Link Control
* LMA - Local Mobility Anchor
* LMI - Local Management Interface
* LMU - Location Management Unit
* LNP - Local Number Portability
* LOC - Location Center
* LSR - Label Switch Router
* LTE - Long-Term Evolution
* M2PA - MTP2 Peer-to-Peer Adaptation Layer
* M2UA - MTP2 User Adaptation Layer
* M3UA - MTP3 User Adaptation Layer
* MAC - Media Access Control
* MAG - Mobile Access Gateway
* MAP - Mobile Application Part
* MBMS - Multimedia Broadcast Multicast Service
* MBS - Maximum Burst Size
* MCE - Multi-cell / multicast Coordination Entity
* MCU - Multipoint Conference Unit
* MD 5 - Message-Digest Algorithm
* MD - Manufacture Discontinue
* MDM - Media Device Manager
* MEGACO - Media Gateway Control Protocol (H.248)
* Mesh-BN - Meshed Bonding Network
* MFC - Most Favored Customer
* MFRP - Multimedia Function Resource Processor
* MG - Media Gateway
* MGC - Media Gateway Controller
* MGCF - Media Gateway Control Function
* MGCP - Media Gateway Control Protocol
* MGW - Media Gateway
* MIB - Management Information Base
* MIMO - Multiple Input, Multiple Output
* MIP - Mobile IP
* MIPS - Million Instructions Per Second
* MM - Mobility Management
* MME - Mobile Management Entity
* MMS - Multimedia Messaging Service
* MNP/LNP - Mobile / Local Number Portability
* MPLS - Multi-Protocol Label Switching
* MPoA - Multi-Protocol over ATM
* MRFC - Multimedia Resource Function Controller
* MRFP - Multimedia Resource Function Processor
* MSC - Mobile Switching Center
* MSCF - Messaging Service Control Function
* MTP - Message Transfer Part
* NA - North American
* NAPT - Network Address Port Translation
* NAS - Network Attached Storage, Not Access Stratum
* NAT - Network Address Translation
* NBAP - Node B Application Part
* NEBS - Network Equipment Building System
* NEDS - Network Equipment Development Standard
* NFS - Network File System
* NGN - Next Generation Network
* NIC - Network Interface Card
* NNI - Network-Network Interface
* NRE - Non-recoverable Engineering
* NS - Network Services
* NSRP - Network Service-Ready Platform
* NTP - Network Time Protocol
* OAM - Operations, Administration & Maintenance
* OC-3 - Optical Carrier Level 3 (155.5Mbps)
* OC-12 - Optical Carrier Level 12 (622.1Mbps)
* OC-48 - Optical Carrier Level 48 (2.488Gbps)
* OC-192 - Optical Carrier Level 192 (9.953Gbps)
* OC-768 - Optical Carrier Level 768 (39.81Gbps)
* OEM - Original Equipment Manufacturer
* OFDM - Orthogonal Frequency Division Multiplexing
* OFDMA - Orthogonal Frequency Division Multiple Access
* OFM - Outage Frequency Measurement
* OM - Operational Measurement
* OPEX - Operating Expense
* OSA - Open Service Access
* OSA-GW - Open Service Access - Gateway
* OSA-SCS - Open Services Architecture Service Capability Server
* OSI - Open Systems Interconnection
* OSP - Open Settlement Protocol
* OSPF - Open Shortest Path First
* OSS - Operations Support System
* OXC - Optical Cross Connect
* P-CSCF - Proxy Call Session Control Function
* P-MSC - Packet Mobile Switching Center
* PBX - Private Branch Exchange
* PCAP - Positioning Calculation Application Part
* PCI - Peripheral Component Interconnect
* PCR - Peak Cell Rate
* PDCP - Packet Data Control Protocol
* PDF - Policy Decision Function
* PDG - Packet Data Gateway
* PDSN - Packet Data Support Node
* PEC - Product Engineering Code
* PG-MSC - Packet Gateway Mobile Switching Center
* PGW - Packet Gateway
* PHP - PHP Hypertext Preprocessor embedded scripting language
* PHY - Physical Layer
* PI - Product Integrity
* PICMG - PCI Industrial Computers Manufacturers Group
* PKM - Privacy Key Management
* PLOA - Protocol Layers Over ATM
* PMC - PCI Mezzanine Card
* PMIP - Proxy Mobile IP
* POTS - Plain Old Telephone Service
* PPC - PowerPC
* PPP - Point-to-Point Protocol
* PPTP - Point-to-Point Tunneling Protocol
* PRI - Primary Rate Interface
* PSF - Protocol-Specific Function
* PSTN - Public Switched Telephone Network
* PTM - Packet Telephony Manager
* PTT - Push-to-Talk
* PVC - Permanent Virtual Circuit
* PVG - Packet Voice Gateway
* QoE - Quality of Experience
* QoS - Quality of Service
* RFP - Request for Proposal
* RFQ - Request for Quote
* RIP - Routing Information Protocol
* RLC - Radio Link Control
* RLC/MAC - GPRS Radio Link Control / Medium Access Control
* RNC - Radio Network Controller
* RNSAP - Radio Network Subsystem Application Part
* ROI - Return on Investment
* RR - Radio Resource
* RRC - Radio Resource Control
* RTCP - Real-time Control Protocol
* RTP - Real-time Transport Protocol
* RTPC - Signaling Route Management Transfer Prohibited Control
* S-CSCF - Serving Call Session Control Function
* SABP - Service Area Broadcast Protocol
* SAE - System Architecture Evolution
* SAF - Service Availability Forum
* SAN - Storage Area Network
* SBC - Session Border Controller, Single Board Computer
* SCCP - Signaling Connection Control Part
* SCF - Switching Control Function
* SCIM - Service Capability Interaction Manager
* SCP - Service Control Point
* SCR - Sustained Cell Rate
* SCS - Service Capability Server
* SCSI - Small Computer System Interface
* SCTP - Stream Control Transmission Protocol
* SDH - Synchronous Digital Hierarchy
* SDHLR - Super Distributed Home Location Register
* SDK - Software Development Kit
* SDP - Session Description Protocol
* SEG - Security Gateway
* SFP - Small Form-factor Pluggable
* SG - Signaling Gateway
* SGF - Set Graphic Rendition
* SGSN - Serving GPRS Support Node
* SHA-1 - Secure Hash Algorithm-1
* SIGTRAN - Signaling Transport
* SIP - Session Initiation Protocol
* SLF - Subscription Locator Function
* SM - Session Management
* SMLC - Serving Mobile Location Center
* SMP - Symmetrical Multi-Processing
* SMS - Short Messaging Service
* SMSC - Short Message Service Center
* SNA - Storage Network Architecture
* SNC - Synchronous Network Clock
* SNDCP - SubNetwork-Dependent Convergence Protocol
* SNMP - Simple Network Management Protocol
* SNTP - Simple Network Time Protocol
* SONET - Synchronous Optical Network
* SPARC - Scalable Processor Architecture
* SPG - Signaling Processor Gateway
* SRF - Specialized Resource Function
* SRNC (UMB) - Session Reference Network Controller
* SRNC (WCDMA) - Serving RNC
* SRTP - Secure Real-Time Protocol
* SS - Supplementary Services
* SS7 - Signaling System 7
* SSC1 - Seismic Server Cabinet 1
* SSCF - Service Specific Coordination Function
* SSCOP - Service Specific Connection Oriented Protocol
* SSCS - Service Specific Convergence Sublayer
* SSF - Service Switching Function
* SSH - Secure Shell
* SSP - Signaling Service Point
* SSS - Signaling Software Subsystem
* STC - Signaling Transport Converter
* STM - Synchronous Transfer Mode
* STP - Signaling Transfer Point
* SUA - SCCP User Adaptation Layer
* SVC - Switched Virtual Circuit
* T1 - Digital Carrier Facility for Digital Signal Level 1
* TAPA - Trillium Advanced Portability Architecture
* TAS - Telephony Application Server
* TC - Transmission Convergence Sublayer
* TCAP - Transaction Capability Application Part
* TCP - Transmission Control Protocol
* TCP/IP - Transmission Control Protocol / Internet Protocol
* TCO - Total Cost of Ownership
* TDM - Time Division Multiplexing
* TEM - Telecom Equipment Manufacturer
* TFTP - Trivial File Transfer Protocol
* THIG - Topology Hiding Internetwork Gateway
* TNL - Transport Network Layer
* TLS - Transport Layer Security
* TRX - Transcoder
* TTS - Text-To-Speech
* TUCL - TCP / UDP Convergence Layer
* TUP - Telephony User Part
* UAS - Universal Audio Server
* UBR - Unspecified Bit Rate
* UDP - User Datagram Protocol
* UE - User Equipment
* UL - Underwriters Laboratory
* UMA - Unlicensed Mobile Access
* UMB - Ultra Mobile Broadband
* UMTS - Universal Mobile Telecommunications System
* UNC - Universal Naming Convention
* UNI - User-Network Interface
* UP - User Plane
* USP - Universal Signaling Point
* UTRAN - UMTS Terrestrial Radio Access Network
* UUI - User-to-User Indicator
* V5.2 - V5.2 Interface Signaling
* V5UA - V5.2-User Adaptation Layer
* V-AAA - Visitor AAA
* VBR - Variable Bit Rate
* VC - Virtual Connection
* VCC - Virtual Channel Connection
* VCCI - Voluntary Control Council for Interference
* VCI - Virtual Channel Identifier
* VCL - Virtual Channel Links
* VLAN - Virtual Local Area Network
* VLR - Visiting Location Register
* VNS - Voice Navigation System
* VO - Validation Office
* VoATM - Voice over ATM
* VoD - Video on Demand
* VoIP - Voice over Internet Protocol
* VP - Virtual Path
* VPI - Virtual Path Identifier
* VPL - Virtual Path Links
* VPN - Virtual Private Network
* VRRP - Virtual Router Redundancy Protocol
* VrTx - Virtual Real-Time Executive real-time operating system
* VXML - Voice Extensible Markup Language
* WAG - Wireless Access Gateway
* WCDMA - Wideband CDMA
* WLAN - Wireless Local Area Network
* WRR - Weighted Round Robin
* WSF - Wireless Service Framework
* X.25 - Packet switched data network protocol
* XFS - X Font Server