Technology

Contact centre glossary: terms, KPIs and technology explained

Contact centres have a language of their own. This glossary explains the terms you will meet in proposals, contracts and reports.

Last reviewed September 2026By the Callrica editorial team12 min read

Performance measures (KPIs)

Abandon rate — The percentage of callers who hang up before reaching an agent. Usually measured after a short threshold (for example five seconds) to exclude misdials.

Adherence (schedule adherence) — How closely agents follow their planned schedule: logged in and available when they are meant to be.

Average handle time (AHT) — The average duration of a contact, including talk or chat time, hold time and after-contact work.

Average speed of answer (ASA) — The average time callers wait in the queue before an agent answers.

Customer effort score (CES) — A survey measure of how easy it was for the customer to get their issue resolved.

Customer satisfaction (CSAT) — A survey measure, usually on a 1–5 scale, of how satisfied the customer was with the interaction.

First-contact resolution (FCR) — The percentage of issues resolved on the first contact, with no need for the customer to contact you again.

Net Promoter Score (NPS) — A loyalty measure based on how likely customers are to recommend the organisation, from −100 to +100.

Occupancy — The share of agents’ logged-in time spent handling contacts or doing related work, as opposed to waiting. Very high occupancy for long periods increases burnout.

Quality score — The result of evaluating a contact against a quality framework. See measuring call quality.

Service level — The percentage of contacts answered within a target time, for example 80% of calls answered within 20 seconds (“80/20”).

Shrinkage — The share of paid time when agents are not available to handle contacts: leave, training, coaching, meetings, breaks and absence.

Technology

ACD (automatic call distributor) — The system that queues incoming calls and routes them to the right agent based on rules such as skills, priority and availability. Today it is usually part of a cloud contact centre platform.

Agent assist — AI that supports agents during live contacts with transcription, suggested answers, knowledge, compliance prompts and automatic summaries.

CCaaS (contact centre as a service) — A cloud-hosted contact centre platform combining routing, IVR, dialler, recording, digital channels and reporting, paid by subscription.

Call recording — Automatic recording of calls (and often screens) for compliance, dispute resolution, training and quality evaluation.

CRM (customer relationship management) — The system that holds customer records and interaction history, giving agents a single view of the customer across channels.

CTI (computer telephony integration) — Integration of telephony with business systems, enabling features such as screen pops (showing the customer’s record when a call arrives) and click-to-dial.

Dialler (predictive, progressive, preview) — Outbound calling software. A predictive dialler places calls automatically and connects only answered calls to agents; progressive and preview diallers dial one call per agent, giving more control and compliance.

IVR (interactive voice response) — An automated phone menu using keypad or speech input to identify callers, provide self-service and route calls. Conversational AI IVR lets callers speak naturally.

Knowledge base — The searchable library of answers, processes and policies agents (and often customers) use.

Omnichannel — Handling voice, chat, email, messaging and social in a connected way, so context follows the customer across channels.

Speech analytics — Software that transcribes and analyses recorded conversations to find reasons for contact, sentiment, compliance risks and trends.

Virtual agent / bot — AI that handles conversations by voice or text without a human agent, typically for simpler requests, handing over to a person when needed.

Virtual desktop infrastructure (VDI) — Remote desktops hosted in a secure data centre or cloud, so agents access systems without data being stored on local devices. Common in offshore outsourcing for security.

WFM (workforce management) — Software for forecasting contact volumes, scheduling agents and tracking adherence.

Outsourcing and operations

BPO (business process outsourcing) — Contracting business processes, such as customer service, to an external provider.

Blended agent — An agent who handles more than one channel or both inbound and outbound work.

Build-operate-transfer (BOT) — A model where a provider sets up and runs an operation, with an option for the client to take ownership later.

Calibration — Sessions where client and provider quality teams score the same contacts to align standards.

Captive centre — An offshore centre owned and operated by the client itself.

Dedicated vs shared team — A dedicated team works only for one client; a shared team handles several clients’ work.

FTE (full-time equivalent) — A unit of staffing equal to one full-time person; used for staffing and pricing.

GBS (global business services) — The wider industry of services delivered to international clients, including contact centres, back office and IT. The term commonly used in South Africa.

Mystery shopping — Trained auditors contacting a centre as customers, using set scenarios, to assess the service from the outside.

Nearshore / offshore / onshore — Onshore means the same country as the customer; nearshore means a nearby country or similar time zone; offshore means a distant country.

Nesting — A supervised period after training in which new agents handle live contacts with extra support.

RFP (request for proposal) — The document inviting providers to bid. See writing an RFP.

Service credit — A fee reduction when a provider misses an agreed service level.

SLA (service level agreement) — The part of the contract that defines the services, performance measures and targets.

Span of control — The number of agents per team leader.

Transition — The move of work to a new provider, including recruitment, training and go-live. See transition.

Data protection and compliance

IDTA (International Data Transfer Agreement) — The UK’s standard contract for restricted transfers of personal data outside the UK.

UK Addendum — An addendum that adapts the EU Standard Contractual Clauses for UK transfers.

SCCs (Standard Contractual Clauses) — EU-approved contract clauses for transferring personal data outside the EU/EEA.

POPIA — South Africa’s Protection of Personal Information Act. See compliance and security.

PCI DSS — The Payment Card Industry Data Security Standard for handling card data.

SOC 2 — An independent audit report on a service organisation’s controls for security, availability, processing integrity, confidentiality and privacy.

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