Telecom Dictionary: OSS, BSS, Billing and Network Terms A to Z

The OSS News Review Telecom Dictionary defines the terms that come up most often in telecom operations, billing and network news, from AAA and CDR to network slicing and zero-touch provisioning. It covers OSS (Operations Support Systems), BSS (Business Support Systems), charging and billing, revenue assurance and fraud, service assurance, fulfillment, 5G and IoT, and the enterprise side of telecom, including audits and expense management.

Each entry gives the full form of the abbreviation, a plain-English definition, and links to related terms. Where OSS News Review has a topic hub or guide on the subject, the entry links to it so you can read the news and analysis behind the definition. The dictionary currently holds 219 terms and was last updated in November 2026. To suggest a term or a correction, use our contact page.

Browse the Dictionary A to Z

0-9 · A · B · C · D · E · F · G · H · I · K · L · M · N · O · P · Q · R · S · T · U · V · W · X · Z

Start With These Guides

0-9

3GPP (3rd Generation Partnership Project): The standards partnership that writes the specifications for GSM, UMTS, LTE and 5G, including the core network, charging and policy functions that OSS and BSS platforms connect to.
See also: 5G, LTE. Networks, 5G and IoT news.
4G (Fourth-generation mobile network): The generation of mobile technology built around LTE, with an all-IP packet core in place of the circuit-switched voice core of earlier networks.
See also: LTE, VoLTE. Networks, 5G and IoT news.
5G (Fifth-generation mobile network): The current generation of mobile technology, defined by 3GPP, offering higher capacity, lower latency and a service-based core network. 5G introduced network slicing and a new set of charging and policy functions.
See also: 5G Core, Network Slicing, Standalone (SA). Networks, 5G and IoT news.
5G Core (5GC): The service-based core network defined for 5G. Its functions, such as the AMF, SMF, PCF and CHF, communicate over HTTP-based interfaces rather than the Diameter links used in 4G.
See also: CHF, PCF, Service-Based Architecture. Networks, 5G and IoT news.

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A

AAA (Authentication, Authorization and Accounting): The three-part framework a network uses to verify who a user is, decide what they may do, and record what they used. RADIUS and Diameter are the most common AAA protocols.
See also: AAA Server, RADIUS, Diameter.
AAA Server: A server that performs authentication, authorization and accounting for network access requests, such as dial-up, broadband, Wi-Fi or VPN logins, and passes usage records on for billing.
See also: AAA, RADIUS.
Access Network: The part of a telecom network that connects subscribers to the provider's core, such as copper, fiber, cable or radio links. Also called the last mile.
See also: FTTH, DSL, RAN.
Account: In billing, the record that holds a customer's contact details, payment terms, balances and the services billed to it. One customer may have several accounts.
See also: Account Hierarchy, Subscriber. Telecom Billing and Charging news.
Account Hierarchy: A parent-child structure of billing accounts, used so that a corporate customer can receive one consolidated invoice while charges are tracked by division, site or user.
See also: Master Account, Sub-account. Telecom Billing and Charging news.
Account Takeover: A fraud in which a criminal gains control of a legitimate customer's account, often through social engineering or a SIM swap, and uses it to order equipment, add services or intercept authentication codes.
See also: SIM Swap Fraud, Subscription Fraud. Read the revenue assurance and fraud guide.
Activation: The step that switches on a service in the network once an order has been provisioned, such as enabling a SIM, a line or a feature.
See also: Provisioning, Service Fulfillment. Service Fulfillment, Provisioning and Inventory news.
Adjustment: A credit or debit applied to a customer's bill after it has been calculated, typically to correct an error, honor a dispute or apply a goodwill gesture.
See also: Billing Dispute, Credit Note. Telecom Billing and Charging news.
ADSL (Asymmetric Digital Subscriber Line): A DSL technology that delivers faster download than upload speeds over copper telephone lines.
See also: DSL, DSLAM.
Agentic AI: AI systems that can plan and carry out multi-step tasks with limited human direction, such as diagnosing a fault, opening a ticket and triggering a fix. Operators are piloting agentic AI in network operations and customer care.
See also: AI, Closed-Loop Automation. OSS/BSS Transformation news.
AI (Artificial Intelligence): In telecom operations, the use of machine learning and generative models for tasks such as fault prediction, fraud detection, customer care, network optimization and natural language administration of OSS and BSS.
See also: AIOps, Agentic AI. OSS/BSS Transformation news.
AIOps (AI for IT Operations): The application of machine learning to operations data, such as alarms, logs and metrics, to detect anomalies, correlate events and reduce the volume of alerts engineers must handle.
See also: Fault Management, Event Correlation. Service Assurance and Network Monitoring news.
Alarm: A notification from a network element or management system that a fault or threshold breach has occurred. Alarms are the raw input to fault management.
See also: Fault Management, Event Correlation. Service Assurance and Network Monitoring news.
API (Application Programming Interface): A defined way for one software system to request data or actions from another. Modern OSS and BSS platforms expose standardized APIs, such as the TM Forum Open APIs, so that components can be swapped and integrated more easily.
See also: TM Forum Open APIs, Network API. OSS/BSS Transformation news.
ARPU (Average Revenue Per User): Total service revenue for a period divided by the average number of subscribers. ARPU is one of the most widely reported operator performance measures.
See also: Churn.
Audit Trail: A chronological record of who changed what in a system and when. Billing and OSS platforms keep audit trails for compliance, dispute resolution and fraud investigation.
Authentication: The process of verifying the identity of a user, device or system before granting access.
See also: AAA, Authorization.
Authorization: The process of deciding what an authenticated user or device is allowed to do, such as which services, speeds or destinations it may use.
See also: AAA, Authentication.

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B

B2B2X: A business model in which an operator sells to a business partner, which then serves its own customers using the operator's network or platform. B2B2X places new demands on partner management and settlement.
See also: Partner Management, Settlement. Telecom Billing and Charging news.
Backhaul: The links that carry traffic from cell sites or access nodes back to the core network, using fiber, microwave or other transport.
See also: Fronthaul, RAN.
Balance Management: The real-time tracking of prepaid credit, allowances and spending limits, usually performed by an online charging system.
See also: OCS, Prepaid. Telecom Billing and Charging news.
Bill Cycle: The recurring period, often monthly, at the end of which a billing system closes usage, applies recurring charges and produces invoices. Customers are often spread across several bill cycles to balance processing load.
See also: Bill Run, Invoice. Telecom Billing and Charging news.
Bill Run: The batch process that generates invoices for all accounts in a bill cycle.
See also: Bill Cycle. Telecom Billing and Charging news.
Bill Shock: A customer's surprise at an unexpectedly high bill, usually caused by roaming, overage or premium-rate charges. Usage notifications and spending caps are the standard defenses.
See also: Roaming, Spending Limit. Telecom Billing and Charging news.
Billing: The set of processes that turn rated usage and recurring charges into invoices, collect payment and manage account balances.
See also: Rating, Convergent Billing, Invoice. Telecom Billing and Charging news.
Billing Dispute: A customer challenge to a charge on an invoice. Disputes are tracked until they are resolved with an adjustment or rejected.
See also: Adjustment, Telecom Audit. Read the telecom audit guide.
Billing Mediation: Mediation focused on preparing usage records for rating and billing. See Mediation.
See also: Mediation, CDR. Mediation and CDR Management news.
BSS (Business Support System): The software a service provider uses to run the customer-facing side of the business: product catalog, ordering, customer management, charging, billing, payments and partner settlement.
See also: OSS, OSS/BSS, Digital BSS. Read the OSS vs BSS guide.
BTN (Billing Telephone Number): The main telephone number under which a carrier groups the lines and services on a business customer's bill. BTNs are a common starting point in a telecom audit.
See also: CSR, Telecom Audit. Read the telecom audit guide.
Bundle: A product that combines several services, such as broadband, mobile and TV, under one price. Bundles add complexity to rating, discounting and revenue sharing.
See also: Product Catalog, Discount. Telecom Billing and Charging news.
Bypass Fraud: A fraud that routes international calls through unauthorized channels, such as SIM boxes or unlicensed VoIP gateways, to avoid the termination fees the destination operator would otherwise collect.
See also: SIM Box Fraud, Interconnect. Read the revenue assurance and fraud guide.

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C

CAMARA: An open-source project, run under the Linux Foundation with GSMA support, that defines common network APIs, such as location, quality on demand and SIM swap checks, so developers can use the same API across operators.
See also: Network API. OSS/BSS Transformation news.
Catalog-Driven: An architecture in which products, services and resources are defined once in a central catalog, and ordering, fulfillment and billing systems read those definitions instead of hard-coding them.
See also: Product Catalog, Service Catalog. Service Fulfillment, Provisioning and Inventory news.
CDR (Call Detail Record): A record created by a switch or network element for each call or session, holding details such as calling and called numbers, start time, duration and the elements involved. CDRs are the raw material of billing, revenue assurance and fraud detection.
See also: xDR, Mediation, EDR. Read the call detail record explainer.
Charging: The calculation of what a service event costs and, for prepaid or controlled services, the authorization and deduction of that amount in real time.
See also: OCS, Rating, CHF. Telecom Billing and Charging news.
CHF (Charging Function): The 5G core network function that performs online and offline charging, replacing the separate online and offline charging systems used in earlier generations.
See also: 5G Core, Converged Charging System, OCS. Telecom Billing and Charging news.
Churn: The rate at which subscribers cancel service over a period. Reducing churn is a primary objective of customer experience and retention programs.
See also: ARPU, Customer Experience Management.
Closed-Loop Automation: An operations model in which monitoring data automatically triggers corrective action, such as rerouting traffic or scaling a function, and the result is measured and fed back into the loop.
See also: Zero-Touch, AIOps. Service Assurance and Network Monitoring news.
Cloud-Native: Software designed to run as containerized microservices that can be deployed, scaled and updated independently, usually on Kubernetes. Cloud-native design is now the default for new OSS, BSS and 5G core software.
See also: Microservices, SaaS. OSS/BSS Transformation news.
CNF (Cloud-Native Network Function): A network function packaged as containers rather than as a virtual machine, the successor to the VNF.
See also: VNF, NFV. Service Fulfillment, Provisioning and Inventory news.
Collections: The process of recovering overdue payments, from reminder notices through service suspension and referral to an agency.
See also: Dunning. Telecom Billing and Charging news.
Converged Charging System (CCS): A charging platform that combines the 5G Charging Function with balance management, rating and policy integration, supporting both 4G and 5G networks.
See also: CHF, Convergent Charging. Telecom Billing and Charging news.
Convergent Billing: Billing that combines several services, payment types or customer segments, such as mobile, fixed, prepaid and postpaid, on one platform and often on one invoice.
See also: Convergent Charging, Billing. Telecom Billing and Charging news.
Convergent Charging: Charging that handles online and offline usage, and prepaid and postpaid customers, in one system with shared balances and rating rules.
See also: Converged Charging System, OCS. Telecom Billing and Charging news.
CORBA (Common Object Request Broker Architecture): A middleware standard once widely used to integrate OSS components. It has largely been replaced by REST APIs.
See also: API.
CPaaS (Communications Platform as a Service): Cloud APIs that let developers add voice, messaging and video to their own applications.
See also: UCaaS, Network API. Unified Communications and Collaboration news.
CPE (Customer Premises Equipment): Equipment installed at the customer's location, such as a router, modem or set-top box, that connects to the provider's network.
See also: Zero-Touch Provisioning.
CPQ (Configure, Price, Quote): Software that helps sales teams assemble a valid product configuration, calculate its price and produce a quote, especially for complex business deals.
See also: Product Catalog, Order Management. Telecom Billing and Charging news.
Credit Limit: The maximum unbilled or unpaid amount an account may accrue before the provider restricts service or requires payment.
See also: Spending Limit, Collections. Telecom Billing and Charging news.
Credit Note: A document that reduces the amount a customer owes, issued to correct an overcharge or settle a dispute.
See also: Adjustment.
CRM (Customer Relationship Management): The BSS component that holds customer records, interactions, cases and sales activity, giving care and sales staff one view of each customer.
See also: BSS, Customer Experience Management. Read the OSS vs BSS guide.
CSP (Communications Service Provider): A company that provides telecommunications services, such as a mobile operator, fixed-line carrier, cable company or MVNO.
See also: MNO, MVNO.
CSR (Customer Service Record): A carrier's record of every line, feature and charge on a customer account, keyed to the BTN. Comparing CSRs to invoices and to what the business actually uses is a core telecom audit technique.
See also: BTN, USOC, Telecom Audit. Read the telecom audit guide.
Customer Experience Management (CEM): Measuring and improving the experience customers receive across network quality, care interactions and billing, using surveys, network data and analytics.
See also: QoE, Churn. Service Assurance and Network Monitoring news.

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D

Data Monetization: Generating revenue from data services or network data, through usage-based plans, premium quality tiers, analytics products or exposed network APIs.
See also: Policy Control, Network API. Telecom Billing and Charging news.
Deep Packet Inspection (DPI): Examining the contents of data packets to identify applications and traffic types, used for policy enforcement, traffic management and security.
See also: Policy Control, PCEF. Telecom Billing and Charging news.
DHCP (Dynamic Host Configuration Protocol): A protocol that automatically assigns IP addresses and network settings to devices when they connect.
See also: Dynamic IP, Static IP.
Diameter: The signaling protocol used for authentication, policy and charging in 4G LTE and IMS networks, designed as a successor to RADIUS.
See also: RADIUS, PCRF, OCS.
DID (Direct Inward Dialing): A service that assigns individual phone numbers that route directly to extensions or users on a business phone system or SIP trunk.
See also: SIP Trunking, PBX. Unified Communications and Collaboration news.
Digital BSS: A modernized business support system built around a product catalog, open APIs and digital self-service channels, intended to launch and change offers quickly.
See also: BSS, Cloud-Native, TM Forum Open APIs. OSS/BSS Transformation news.
Digital Twin: A software model of a physical network or system, kept in sync with live data, used to simulate changes before they are made.
See also: Network Inventory. Service Assurance and Network Monitoring news.
Discount: A price reduction applied by the rating or billing engine based on rules such as volume, bundle membership, loyalty or promotions.
See also: Bundle, Rating. Telecom Billing and Charging news.
DNS (Domain Name System): The internet's directory service, which translates domain names into the IP addresses computers use to connect.
DSL (Digital Subscriber Line): Broadband delivered over copper telephone lines. DSL has been largely replaced by fiber in many markets.
See also: ADSL, DSLAM, FTTH.
DSLAM (Digital Subscriber Line Access Multiplexer): Equipment at the exchange or a street cabinet that aggregates many DSL lines onto a high-capacity network link.
See also: DSL.
Dunning: The sequence of increasingly firm reminders sent to customers with overdue balances.
See also: Collections. Telecom Billing and Charging news.
Dynamic IP: An IP address assigned temporarily to a device, usually by DHCP, which may change between sessions.
See also: Static IP, DHCP.

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E

E911 (Enhanced 911): The US emergency calling system that delivers a caller's number and location to the 911 call center. Kari's Law and RAY BAUM'S Act extended E911 obligations to multi-line business phone systems.
See also: Kari's Law, RAY BAUM'S Act. Unified Communications and Collaboration news.
EDR (Event Detail Record): A usage record for a non-voice event, such as a data session, message or content purchase. See also xDR.
See also: CDR, xDR. Mediation and CDR Management news.
eSIM (Embedded SIM): A SIM built into a device and programmed remotely, so subscriptions can be downloaded and switched without a physical card. GSMA specifications such as SGP.22 and SGP.32 govern consumer and IoT eSIM provisioning.
See also: SIM, IoT. Networks, 5G and IoT news.
eTOM (Enhanced Telecom Operations Map): TM Forum's Business Process Framework, a reference catalog of the business processes a service provider performs, organized from strategy through operations. It gives operators and vendors a shared vocabulary for process design.
See also: TM Forum, ODA, SID. OSS/BSS Transformation news.
Event Correlation: Grouping related alarms and events to identify a single root cause, so engineers see one problem instead of hundreds of symptoms.
See also: Alarm, Fault Management, AIOps. Service Assurance and Network Monitoring news.

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F

Fault Management: The OSS function that collects, filters, correlates and tracks alarms from network equipment so faults can be diagnosed and repaired.
See also: Alarm, Service Assurance. Service Assurance and Network Monitoring news.
FCAPS (Fault, Configuration, Accounting, Performance, Security): The ITU-T model of network management functions, long used to organize OSS capabilities.
See also: Fault Management, Performance Management. Read the OSS vs BSS guide.
Fraud Management: The systems and processes a provider uses to detect, investigate and stop fraudulent use of its network and services, from subscription fraud to IRSF and SIM box operations.
See also: Revenue Assurance, IRSF, SIM Box Fraud. Read the revenue assurance and fraud guide.
Fronthaul: The link between a radio unit at a cell site and the baseband or distributed unit that processes its signals.
See also: Backhaul, Open RAN.
FTTH (Fiber to the Home): A broadband architecture that runs optical fiber all the way to the subscriber's home, as opposed to fiber to a cabinet or node with copper for the final segment.
See also: FTTx, Access Network. Networks, 5G and IoT news.
FTTx (Fiber to the x): A family of broadband architectures named for where the fiber ends: the home (FTTH), premises (FTTP), building (FTTB) or curb and cabinet (FTTC).
See also: FTTH. Networks, 5G and IoT news.
Fulfillment: See Service Fulfillment.
See also: Service Fulfillment. Service Fulfillment, Provisioning and Inventory news.

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G

General Ledger (GL): The accounting system of record. Billing platforms post revenue, taxes and payments to general ledger codes so finance can report on them.
See also: Revenue Recognition.
GSMA: The industry association representing mobile operators worldwide. It publishes specifications such as eSIM and RCS standards and runs MWC.
See also: MWC, eSIM. Industry Events and Awards news.

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H

Hosted PBX: A business phone system run in a provider's cloud rather than on equipment at the customer site.
See also: PBX, UCaaS. Unified Communications and Collaboration news.

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I

IMS (IP Multimedia Subsystem): The 3GPP architecture for delivering voice, video and messaging over IP networks. VoLTE and VoNR run on IMS.
See also: VoLTE, SIP. Networks, 5G and IoT news.
Intent-Based Networking: An approach in which operators state the outcome they want, such as a latency target for a service, and automation software translates that intent into network configuration.
See also: Closed-Loop Automation, Zero-Touch. Service Fulfillment, Provisioning and Inventory news.
Interconnect: The physical and commercial connection between two operators' networks so their customers can reach each other.
See also: Interconnect Billing, Settlement. Telecom Billing and Charging news.
Interconnect Billing: Calculating, invoicing and reconciling the charges operators owe each other for traffic carried across their networks.
See also: Interconnect, Settlement, Wholesale. Telecom Billing and Charging news.
Inventory: See Network Inventory.
See also: Network Inventory. Service Fulfillment, Provisioning and Inventory news.
Invoice: The bill presented to a customer, itemizing recurring charges, usage, taxes, adjustments and the amount due.
See also: Bill Cycle, Billing. Telecom Billing and Charging news.
IoT (Internet of Things): Devices such as meters, trackers, sensors and vehicles that connect to networks to send and receive data. IoT brings very large device counts and low revenue per connection, which changes how operators provision, monitor and bill.
See also: eSIM, M2M, IoT Connectivity Management. Networks, 5G and IoT news.
IoT Connectivity Management: A platform that lets enterprises and operators activate, monitor, control and bill large fleets of IoT SIMs.
See also: IoT, eSIM. Networks, 5G and IoT news.
IP (Internet Protocol): The addressing and routing protocol that carries data across the internet and most modern telecom networks.
IPTV (Internet Protocol Television): Television delivered over a managed IP network rather than broadcast or cable.
IRSF (International Revenue Share Fraud): A fraud in which criminals generate large volumes of calls to high-cost international or premium numbers, often from hacked PBXs or stolen SIMs, and collect a share of the termination revenue. It is among the costliest telecom frauds.
See also: Wangiri, PBX Fraud, Fraud Management. Read the revenue assurance and fraud guide.
ITU (International Telecommunication Union): The United Nations agency for information and communication technologies. Its ITU-T sector publishes many telecom standards and recommendations.
See also: FCAPS.

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K

Kari's Law: A US federal law, effective in 2020 for new systems, that requires multi-line telephone systems to allow direct dialing of 911 without a prefix and to notify a central point on site when 911 is called.
See also: E911, RAY BAUM'S Act, MLTS. Unified Communications and Collaboration news.
KPI (Key Performance Indicator): A measure used to track performance against a target, such as network availability, dropped call rate, mean time to repair or billing accuracy.
See also: SLA, MTTR. Service Assurance and Network Monitoring news.

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L

Latency: The time it takes data to travel from source to destination, usually measured in milliseconds.
See also: QoS, 5G.
LDAP (Lightweight Directory Access Protocol): A protocol for querying and maintaining directory information, such as user accounts and permissions.
Leakage: See Revenue Leakage.
See also: Revenue Leakage. Read the revenue assurance and fraud guide.
LNP (Local Number Portability): The ability of a US customer to keep a telephone number when switching carriers within the same area. See Number Portability.
See also: Number Portability.
LTE (Long-Term Evolution): The 3GPP standard for 4G mobile networks, built on an all-IP Evolved Packet Core.
See also: 4G, VoLTE. Networks, 5G and IoT news.

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M

M2M (Machine-to-Machine): Communication between devices without human involvement, the predecessor term to IoT.
See also: IoT. Networks, 5G and IoT news.
Managed Services: An arrangement in which a vendor or service provider operates a system or function, such as billing, revenue assurance or the network itself, on the operator's behalf under a service contract.
See also: SaaS, SLA. Customer Contracts and Deployments news.
Master Account: The top account in an account hierarchy, which receives the consolidated invoice for its sub-accounts.
See also: Account Hierarchy, Sub-account. Telecom Billing and Charging news.
Mediation: The layer that collects raw usage records from network elements and converts them into clean, consistent records for rating, billing, revenue assurance and analytics. Mediation filters, deduplicates, correlates and enriches records in batch or in real time.
See also: CDR, xDR, Rating. Mediation and CDR Management news.
Microservices: An architecture that breaks an application into small, independently deployable services that communicate through APIs.
See also: Cloud-Native. OSS/BSS Transformation news.
MLTS (Multi-Line Telephone System): A phone system serving many users at one location, such as a business PBX. MLTS operators have specific 911 obligations under Kari's Law and RAY BAUM'S Act.
See also: Kari's Law, PBX. Unified Communications and Collaboration news.
MNO (Mobile Network Operator): An operator that owns or controls radio spectrum and a mobile network, and sells service directly or wholesales capacity to MVNOs.
See also: MVNO, CSP.
MTTR (Mean Time to Repair): The average time taken to restore a failed service or component, a standard service assurance KPI.
See also: KPI, SLA. Service Assurance and Network Monitoring news.
MVNA (Mobile Virtual Network Aggregator): A wholesaler that buys capacity from a host operator and resells it to multiple MVNOs.
See also: MVNO, MVNE.
MVNE (Mobile Virtual Network Enabler): A company that provides the BSS, OSS and core network integration an MVNO needs, so the MVNO can launch without building its own platforms.
See also: MVNO, MVNA. Networks, 5G and IoT news.
MVNO (Mobile Virtual Network Operator): A mobile service provider that does not own a radio network and instead buys wholesale access from a host operator, competing on brand, price or a specific audience.
See also: MNO, MVNE. Networks, 5G and IoT news.
MWC: The mobile industry's largest annual trade event, held in Barcelona and organized by the GSMA. It was known as 3GSM World Congress until 2008.
See also: GSMA. Industry Events and Awards news.

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N

Network API: An API that exposes network capabilities, such as device location, quality on demand or SIM swap status, to developers and enterprises.
See also: CAMARA, API. OSS/BSS Transformation news.
Network Element: Any physical or virtual device that performs a function in the network, such as a router, switch, base station or core network function.
See also: NMS, Alarm.
Network Inventory: The OSS record of the physical and logical resources in a network, such as sites, equipment, ports, circuits and IP addresses, and the services that use them. Accurate inventory underpins fulfillment, assurance and planning.
See also: Service Inventory, Digital Twin. Service Fulfillment, Provisioning and Inventory news.
Network Slicing: A 5G capability that runs several isolated virtual networks over shared infrastructure, each tuned for a specific use, such as low latency for industrial control or high capacity for video. Slices must be ordered, monitored and billed like any other service.
See also: 5G, SLA. Networks, 5G and IoT news.
NFV (Network Functions Virtualization): Running network functions, such as firewalls, routers and core elements, as software on standard servers rather than on dedicated hardware appliances.
See also: VNF, CNF, NFV MANO. Service Fulfillment, Provisioning and Inventory news.
NFV MANO (Management and Orchestration): The ETSI framework for managing the lifecycle of virtualized network functions and the infrastructure they run on.
See also: NFV, Orchestration. Service Fulfillment, Provisioning and Inventory news.
NMS (Network Management System): Software that monitors and configures network elements, typically supplied for a specific vendor's equipment or technology domain.
See also: Network Element, Fault Management. Service Assurance and Network Monitoring news.
NOC (Network Operations Center): The facility or team that monitors a network around the clock and responds to faults and incidents.
See also: Fault Management, SOC. Service Assurance and Network Monitoring news.
NRTRDE (Near Real-Time Roaming Data Exchange): A GSMA standard that requires visited networks to send roaming usage records to the home operator within hours, so the home operator can detect roaming fraud quickly.
See also: Roaming, TAP. Read the revenue assurance and fraud guide.
Number Portability: The ability of customers to keep their phone number when they change provider. Porting requires coordination between operators and a central database or clearinghouse.
See also: LNP, SIM Swap Fraud.
NWDAF (Network Data Analytics Function): The 5G core function that collects network data and provides analytics, such as load predictions, to other network functions and to the OSS.
See also: 5G Core. Networks, 5G and IoT news.

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O

O-RAN Alliance: The industry group that develops the open interface specifications used in Open RAN deployments.
See also: Open RAN, RIC. Networks, 5G and IoT news.
OCS (Online Charging System): A system that authorizes and charges usage in real time, checking and deducting balances while a call or data session is in progress. It is essential for prepaid services and spending controls.
See also: Charging, CHF, Balance Management. Telecom Billing and Charging news.
ODA (Open Digital Architecture): TM Forum's reference architecture for replacing tightly coupled OSS and BSS stacks with standardized, interchangeable software components connected through Open APIs.
See also: TM Forum, TM Forum Open APIs, eTOM. OSS/BSS Transformation news.
Offline Charging: Charging in which usage is recorded and rated after the fact for later billing, as with most postpaid services.
See also: OCS, Charging. Telecom Billing and Charging news.
Open RAN: An approach to the radio access network based on open, standardized interfaces between radio, distributed and centralized units, allowing operators to combine equipment from different vendors.
See also: RAN, RIC, O-RAN Alliance. Networks, 5G and IoT news.
Orchestration: Automated coordination of the steps and systems needed to deliver or change a service, across network domains and vendors.
See also: Service Orchestration, NFV MANO. Service Fulfillment, Provisioning and Inventory news.
Order Management: The OSS or BSS function that captures customer orders, breaks them into the tasks needed to deliver them and tracks each order to completion.
See also: Service Fulfillment, Order to Cash. Service Fulfillment, Provisioning and Inventory news.
Order to Cash: The end-to-end process from a customer's order through fulfillment, activation, billing and payment.
See also: Order Management, Billing. Service Fulfillment, Provisioning and Inventory news.
OSS (Operations Support System): The software a service provider uses to plan, build, provision, monitor and maintain its network and services. OSS covers inventory, fulfillment, service assurance and network management.
See also: BSS, OSS/BSS, FCAPS. Read the OSS vs BSS guide.
OSS/BSS: The combined set of operations and business support systems that run a service provider, from network management through to billing and customer care.
See also: OSS, BSS. Read the OSS vs BSS guide.
OSS/J (OSS through Java): A former industry initiative that defined Java-based APIs for integrating OSS components. Its work fed into later TM Forum API efforts.
See also: TM Forum Open APIs.
OTT (Over the Top): Services delivered over an internet connection by a party other than the network operator, such as messaging apps or streaming video.

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P

Partner Management: BSS capabilities for onboarding partners, managing their products and agreements, and settling revenue shares with them.
See also: Settlement, B2B2X. Telecom Billing and Charging news.
PBX (Private Branch Exchange): A private telephone switch serving an organization's internal lines and connecting them to the public network.
See also: Hosted PBX, PBX Fraud, SIP Trunking. Unified Communications and Collaboration news.
PBX Fraud: Fraud in which criminals break into a company's phone system, often through default passwords or voicemail features, and use it to place calls to costly international or premium numbers. The company is usually liable for the charges.
See also: IRSF, PBX. Read the revenue assurance and fraud guide.
PCEF (Policy and Charging Enforcement Function): The 4G network function, usually in the packet gateway, that enforces the policy and charging rules supplied by the PCRF.
See also: PCRF, Policy Control. Telecom Billing and Charging news.
PCF (Policy Control Function): The 5G core function that provides policy rules for sessions, the successor to the 4G PCRF.
See also: PCRF, 5G Core. Telecom Billing and Charging news.
PCRF (Policy and Charging Rules Function): The 4G network function that decides, in real time, how a subscriber's data session is treated, including speed, priority, quotas and charging rules, based on plan, balance and network conditions.
See also: PCF, PCEF, Policy Control. Telecom Billing and Charging news.
Performance Management: The OSS function that collects and analyzes performance counters from the network to track capacity, quality and trends over time.
See also: Fault Management, KPI. Service Assurance and Network Monitoring news.
Policy Control: Real-time rules that govern how network resources are allocated to subscribers and applications, such as throttling after a data cap or prioritizing a premium service.
See also: PCRF, PCF. Telecom Billing and Charging news.
Porting: Moving a telephone number from one provider to another. See Number Portability.
See also: Number Portability.
Postpaid: A payment model in which customers use services first and are billed afterward, usually monthly.
See also: Prepaid, Bill Cycle. Telecom Billing and Charging news.
Prepaid: A payment model in which customers buy credit in advance and usage is deducted in real time.
See also: Postpaid, OCS. Telecom Billing and Charging news.
Probe: A passive monitoring device or software agent that captures network traffic and signaling to measure performance and troubleshoot problems.
See also: Service Assurance, QoE. Service Assurance and Network Monitoring news.
Product Catalog: The central definition of everything a provider sells, including product structures, prices, eligibility rules and the services each product requires.
See also: Catalog-Driven, Service Catalog, CPQ. Telecom Billing and Charging news.
Provisioning: Configuring network elements, systems and records so a customer can use an ordered service.
See also: Activation, Service Fulfillment, Zero-Touch Provisioning. Service Fulfillment, Provisioning and Inventory news.
PSTN (Public Switched Telephone Network): The traditional circuit-switched telephone network. Many countries are retiring PSTN infrastructure in favor of IP-based voice.
See also: SIP, VoIP.

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Q

QoE (Quality of Experience): How well a service performs from the user's point of view, such as video buffering or call clarity, as distinct from network-level measurements.
See also: QoS, Customer Experience Management. Service Assurance and Network Monitoring news.
QoS (Quality of Service): Network-level measures and mechanisms, such as latency, jitter, packet loss and traffic prioritization, used to deliver a defined level of performance.
See also: QoE, SLA. Service Assurance and Network Monitoring news.

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R

RADIUS (Remote Authentication Dial-In User Service): A widely used AAA protocol for authenticating network access and sending accounting records, common in broadband, Wi-Fi and enterprise networks.
See also: AAA, Diameter.
RAN (Radio Access Network): The part of a mobile network that connects devices over radio to the core network, including antennas, radios and baseband processing.
See also: Open RAN, Backhaul. Networks, 5G and IoT news.
Rating: Applying prices to usage records, such as call minutes, data volume or messages, according to the customer's plan, time of day, destination and discounts.
See also: Rating Engine, Charging, Billing. Telecom Billing and Charging news.
Rating Engine: The software component that performs rating, calculating the charge for each usage event.
See also: Rating. Telecom Billing and Charging news.
RAY BAUM'S Act: A US law whose Section 506 required the FCC to ensure that 911 calls from multi-line telephone systems convey a dispatchable location, such as the street address plus floor or room.
See also: E911, Kari's Law. Unified Communications and Collaboration news.
Reconciliation: Comparing records from two systems, such as network usage against billed usage, or an invoice against a contract, to find and explain differences.
See also: Revenue Assurance, Telecom Audit. Read the revenue assurance and fraud guide.
Recurring Charge: A fixed charge billed every period, such as a monthly plan fee or equipment rental.
See also: Bill Cycle, Usage Charge. Telecom Billing and Charging news.
Revenue Assurance: The discipline of making sure a service provider correctly bills and collects for every service it delivers, by reconciling records across network, mediation, billing and finance systems and fixing the causes of leakage.
See also: Revenue Leakage, Fraud Management, Reconciliation. Read the revenue assurance and fraud guide.
Revenue Leakage: Revenue lost because services were delivered but not billed, billed at the wrong rate or billed but not collected. Common causes include provisioning errors, missing usage records and outdated rating tables.
See also: Revenue Assurance. Read the revenue assurance and fraud guide.
Revenue Recognition: The accounting rules that determine when revenue can be reported, such as the IFRS 15 and ASC 606 standards, which affect how bundles and device subsidies are booked.
See also: General Ledger.
RIC (RAN Intelligent Controller): An Open RAN component that hosts applications, called xApps and rApps, to optimize and control radio network behavior.
See also: Open RAN. Networks, 5G and IoT news.
Roaming: Using a mobile service on another operator's network, usually abroad. Roaming usage is exchanged and settled between operators.
See also: TAP, NRTRDE, Settlement. Telecom Billing and Charging news.
Robocall: An automated, prerecorded telephone call. Unwanted and illegal robocalls led to caller ID authentication rules such as STIR/SHAKEN.
See also: STIR/SHAKEN.

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S

SaaS (Software as a Service): Software delivered and run by the vendor in the cloud, paid for by subscription. A growing share of BSS and some OSS is now offered as SaaS.
See also: Cloud-Native, Managed Services. OSS/BSS Transformation news.
SD-WAN (Software-Defined Wide Area Network): A technology that manages enterprise network connections, such as broadband, MPLS and 4G or 5G, as one network and routes traffic by application policy.
See also: SDN. Networks, 5G and IoT news.
SDN (Software-Defined Networking): An architecture that separates network control from packet forwarding, so the network can be programmed centrally through software.
See also: NFV, SD-WAN. Service Fulfillment, Provisioning and Inventory news.
Service Assurance: The part of OSS that keeps live services working, through fault management, performance management, testing, SLA monitoring and customer experience analytics.
See also: Fault Management, Performance Management, SLA. Service Assurance and Network Monitoring news.
Service Catalog: The OSS definition of the technical services the network can deliver and the resources each requires, linked to the commercial product catalog.
See also: Product Catalog, Catalog-Driven. Service Fulfillment, Provisioning and Inventory news.
Service Fulfillment: Everything required to deliver an ordered service: order management, design, resource assignment, provisioning and activation.
See also: Order Management, Provisioning. Service Fulfillment, Provisioning and Inventory news.
Service Inventory: The record of each service instance delivered to customers and the network resources it uses.
See also: Network Inventory. Service Fulfillment, Provisioning and Inventory news.
Service Orchestration: Automation that coordinates the systems and network domains needed to deliver an end-to-end service.
See also: Orchestration, Service Fulfillment. Service Fulfillment, Provisioning and Inventory news.
Service-Based Architecture (SBA): The 5G core design in which network functions offer services to each other over standard web interfaces.
See also: 5G Core. Networks, 5G and IoT news.
Settlement: Calculating and paying the amounts owed between operators or partners for interconnect, roaming, content or revenue-share arrangements.
See also: Interconnect Billing, Partner Management, Roaming. Telecom Billing and Charging news.
SID (Shared Information/Data Model): TM Forum's Information Framework, a common data model for the entities a service provider manages, such as customers, products, services and resources.
See also: eTOM, ODA. OSS/BSS Transformation news.
SIM (Subscriber Identity Module): The secure chip, physical or embedded, that identifies a subscriber to a mobile network.
See also: eSIM, SIM Swap Fraud.
SIM Box Fraud: A form of bypass fraud in which a device holding many local SIM cards converts incoming international calls into local calls, avoiding international termination charges.
See also: Bypass Fraud, Fraud Management. Read the revenue assurance and fraud guide.
SIM Swap Fraud: Fraud in which a criminal persuades or deceives a mobile provider into moving a victim's number to a SIM the criminal controls, then intercepts calls and one-time passcodes.
See also: Account Takeover, Number Portability. Read the revenue assurance and fraud guide.
SIP (Session Initiation Protocol): The signaling protocol used to set up, manage and end voice and video calls over IP networks.
See also: SIP Trunking, VoIP, IMS. Unified Communications and Collaboration news.
SIP Trunking: Delivering phone service to a business phone system over an IP connection using SIP, replacing traditional PRI or analog lines.
See also: SIP, DID, PBX. Unified Communications and Collaboration news.
SLA (Service Level Agreement): A contract term that defines the level of service a provider commits to, such as availability or repair time, and the credits owed if it is missed.
See also: KPI, MTTR, Service Assurance. Service Assurance and Network Monitoring news.
SMS (Short Message Service): Text messaging over mobile networks.
SOC (Security Operations Center): The team or facility that monitors and responds to security threats. In telecom, SOC and NOC functions increasingly share data.
See also: NOC.
Spending Limit: A cap on charges a customer can incur, enforced in real time by the charging system to prevent bill shock or credit risk.
See also: Bill Shock, Credit Limit. Telecom Billing and Charging news.
Standalone (SA): A 5G deployment that uses a 5G core network, as opposed to Non-Standalone (NSA), which anchors 5G radio on a 4G core. Network slicing and the 5G charging functions require SA.
See also: 5G, 5G Core. Networks, 5G and IoT news.
Static IP: An IP address permanently assigned to a device or customer, often sold as a business add-on.
See also: Dynamic IP.
STIR/SHAKEN: A caller ID authentication framework, mandated for US voice providers by the FCC, that digitally signs calls so the receiving network can verify the calling number has not been spoofed.
See also: Robocall.
Sub-account: An account that sits beneath a master account in a hierarchy, with its own services and usage but billed through the parent.
See also: Account Hierarchy, Master Account. Telecom Billing and Charging news.
Subscriber: A person or device using a service under an account. One account may have many subscribers.
See also: Account.
Subscription: A customer's agreement to receive a product or service over time, usually with recurring charges.
See also: Recurring Charge. Telecom Billing and Charging news.
Subscription Fraud: Opening an account with false or stolen identity details with no intention of paying, often to obtain subsidized devices. CFCA ranks it among the most common fraud methods.
See also: Account Takeover, Fraud Management. Read the revenue assurance and fraud guide.

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T

TAP (Transferred Account Procedure): The GSMA standard file format operators use to exchange roaming usage records for billing between home and visited networks.
See also: Roaming, NRTRDE. Telecom Billing and Charging news.
Telecom Audit: A review of an organization's telecom invoices, contracts, inventory and usage to find billing errors, unused services and savings, and to recover overcharges from carriers.
See also: CSR, Telecom Expense Management. Read the telecom audit guide.
Telecom Expense Management (TEM): The ongoing management of an organization's telecom services and spending, including inventory, ordering, invoice processing, auditing, allocation and optimization.
See also: Telecom Audit, Zero-Use Line. Read the telecom expense management guide.
TM Forum: The industry association for service providers and their suppliers. It publishes frameworks such as eTOM, the SID data model, the Open Digital Architecture and the Open APIs, and runs the Catalyst proof-of-concept program. It was formerly called the TeleManagement Forum.
See also: eTOM, ODA, TM Forum Open APIs. Industry Events and Awards news.
TM Forum Open APIs: A library of standardized REST API specifications published by TM Forum for functions such as product ordering, customer management and trouble ticketing, used to connect OSS and BSS components from different vendors.
See also: API, ODA. OSS/BSS Transformation news.
Trouble Ticket: A record that tracks a reported problem from creation through diagnosis and resolution.
See also: Fault Management, MTTR. Service Assurance and Network Monitoring news.

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U

UC (Unified Communications): The integration of voice, video, messaging, presence and conferencing into one user experience, such as Microsoft Teams, Webex or Zoom.
See also: UCaaS, UC Management. Unified Communications and Collaboration news.
UC Management: Software that provisions users, licenses, phone numbers and policies across UC platforms from one console, often spanning several vendors.
See also: UC, Zero-Touch Provisioning. Unified Communications and Collaboration news.
UCaaS (Unified Communications as a Service): Unified communications delivered from the cloud on a subscription basis.
See also: UC, CPaaS, Hosted PBX. Unified Communications and Collaboration news.
Usage Charge: A charge based on what a customer used, such as minutes, gigabytes or messages, as opposed to a recurring charge.
See also: Rating, Recurring Charge. Telecom Billing and Charging news.
USOC (Universal Service Order Code): A code carriers use on customer service records and invoices to identify a specific service or feature. Matching USOCs to what the business actually uses is a standard telecom audit step.
See also: CSR, Telecom Audit. Read the telecom audit guide.

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V

VNF (Virtual Network Function): A network function running as software in a virtual machine on standard servers, the building block of NFV.
See also: NFV, CNF. Service Fulfillment, Provisioning and Inventory news.
VoIP (Voice over Internet Protocol): Voice calls carried as data over IP networks rather than circuit-switched lines.
See also: SIP, VoLTE. Unified Communications and Collaboration news.
VoLTE (Voice over LTE): Voice calls carried over a 4G LTE network using IMS, replacing the fallback to 2G or 3G circuit-switched voice.
See also: IMS, VoNR. Networks, 5G and IoT news.
VoNR (Voice over New Radio): Voice calls carried natively over a 5G standalone network using IMS.
See also: VoLTE, 5G. Networks, 5G and IoT news.
VPN (Virtual Private Network): An encrypted connection over a public network that gives remote users or sites private access to an organization's resources.

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W

Wangiri: A fraud, from the Japanese for one ring and drop, in which fraudsters call mobile phones and hang up after one ring so victims return the call to a premium-rate number.
See also: IRSF, Fraud Management. Read the revenue assurance and fraud guide.
Wholesale: Selling network capacity or services to other operators or resellers rather than to end customers.
See also: Interconnect Billing, MVNO. Telecom Billing and Charging news.

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X

xDR: A collective term for usage records of every type, including call detail records, event detail records and IP detail records.
See also: CDR, EDR, Mediation. Mediation and CDR Management news.

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Z

Zero-Touch: The goal of fully automated network and service operations in which provisioning, assurance and repair need no manual steps. ETSI's Zero-touch network and Service Management (ZSM) group publishes related specifications.
See also: Closed-Loop Automation, Zero-Touch Provisioning. Service Fulfillment, Provisioning and Inventory news.
Zero-Touch Provisioning (ZTP): Automatic configuration of a new device, such as a router or CPE, when it is first connected, without an engineer on site.
See also: Provisioning, CPE. Service Fulfillment, Provisioning and Inventory news.
Zero-Use Line: A line or mobile subscription that is still billed but shows no usage over a set period. Zero-use lines are among the most common savings found in a telecom audit.
See also: Telecom Audit, Telecom Expense Management. Read the telecom expense management guide.

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About This Dictionary

OSS News Review first published a telecom dictionary in 2005, when most of the industry’s vocabulary came from switched voice, dial-up access and the first convergent billing platforms. This edition replaces it. The definitions are written by OSS News Review for a mixed audience of operators, vendors, enterprise buyers and analysts, and they favor how a term is used in practice over the exact wording of any one standard. Where a standards body owns a term, such as 3GPP, the GSMA, ETSI or TM Forum, the entry names it.

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