Call Center Acronyms and Abbreviations: The Complete Contact Center Glossary

There’s no end to the alphabet soup in the world of contact centers. 

Whether you work in sales, lead generation, or compliance, this A–Z guide explains common call center acronyms and abbreviations used across today’s call center technology and operations. 

Download the Call Center Acronyms A-Z Cheat Sheet (PDF)

Need a quick offline reference for your team? Download the Call Center Acronyms Cheat Sheet (PDF) to keep these essential terms at your fingertips.

A–C

Metrics & KPIs

AHT – Average Handle Time: The average duration of one customer interaction, including talk, hold, and after-call work.

ASA – Average Speed of Answer: The average time it takes for an agent to answer an incoming call.

ATA – Average Time of Abandonment: Average wait time before a caller hangs up.

ATT – Average Talk Time: Average amount of time agents spend speaking with a customer.

CES – Customer Effort Score: Measures how easy it was for a customer to resolve their issue.

CPA – Cost per Acquisition: The cost of acquiring a new customer.

CPL – Cost per Lead: The cost to acquire a single qualified lead.

CPS – Calls Per Second: A performance metric used to manage traffic, especially for high-volume services like those using SIP trunks or predictive dialers

CSAT – Customer Satisfaction Score: A simple measure of how satisfied a customer is after an interaction.

CTR – Click-Through Rate: The percentage of people who click a call button or link in an ad to contact a call center via phone. 

Compliance & regulatory

ATDS – Automatic Telephone Dialing System: Equipment capable of storing or generating numbers and dialing them automatically. A critical TCPA definition.

CMS – Centers for Medicare and Medicaid Services: Federal agency overseeing health marketing compliance.

CNAM – Caller Name Delivery: Displays the caller’s name; impacts trust and answer rates.

Tech & telephony

ACD – Automatic Call Distribution: Routes calls to agents based on skills, availability, or rules.

AI – Artificial Intelligence: Technology used in contact centers to automate tasks like call routing, lead handling, and performance analysis. 

AMD – Answering Machine Detection: Technology that distinguishes live answers from answering machines on outbound calls. 

ANI – Automatic Number Identification: Displays the caller’s phone number to the receiver.

API – Application Programming Interface: Connects systems such as dialers, CRMs, and reporting tools.

ASR – Automatic Speech Recognition: Converts voice to text for routing and transcription.

CCaaS – Contact Center as a Service: Cloud-based software enabling omnichannel communication.

CDR – Call Detail Record: Data log capturing call metadata like duration and disposition.

CLI/CLID – Caller Line Identification: Displays the number of the caller; key to outbound transparency.

CRM – Customer Relationship Management: System used to manage leads, customers, and communication history.

CTI – Computer Telephony Integration: Links call-handling systems with desktop tools or CRMs.

Operations & workforce/sales

ACW – After Call Work: The tasks agents complete after a call (e.g., notes, follow-up).

BCP – Business Continuity Planning: Planning that ensures contact centers remain operational during disruptions.

BI – Business Intelligence: A process of using data to help organizations make decisions.

BPO – Business Process Outsourcing: Contracting external teams for sales or support functions.

CEM – Customer Experience Management: Practices that improve customer satisfaction and loyalty.

CSR/CSA – Customer Service Representative/Assistant: Frontline roles handling customer interactions.

CX – Customer Experience: The full perception a customer has across every touchpoint.

D–F

Metrics & KPIs

EWT – Expected Wait Time: Predicts how long a caller will wait in a queue before being answered.

FCR – First Call Resolution: Measures how often customer issues are resolved without a follow-up call.

FCRR – First Call Resolution Rate: The percentage of calls resolved on the first attempt.

Compliance & regulatory

DNC – Do Not Call: Refers to lists of consumers who have opted out of telemarketing calls.

EBR – Existing Business Relationship: A business relationship that may allow certain telemarketing calls under federal Do Not Call rules. 

ECPA – The Electronic Communications Privacy Act: A US federal law that protects the privacy of electronic communications from unauthorized interception, access, and disclosure.

FCC – Federal Communications Commission: U.S. agency regulating telecom, including robocall enforcement.

FTC – Federal Trade Commission: Oversees consumer protection laws relevant to telemarketing and sales practices.

Tech & telephony

DID – Direct Inward Dialing: A phone number used for inbound or outbound calling without requiring a dedicated physical line. 

Operations & workforce/sales

ESAT – Employee Satisfaction Score: Measures happiness and engagement of call center agents.

G–L

Metrics & KPIs

KPI – Key Performance Indicator: Quantifiable metric to track progress toward business goals.

LTV – Lifetime Value: The projected revenue a customer will generate over the relationship.

Compliance & regulatory

KBA – Knowledge-Based Authentication: An identity verification method using personal or account-based questions. 

Tech & telephony

IVA – Intelligent Virtual Agent: AI system that interacts with callers conversationally.

IVR – Interactive Voice Response: Automated menus that allow callers to navigate by voice or keypad.

Operations & workforce/sales

KM – Knowledge Management: Framework for capturing and sharing company knowledge.

M–P

Metrics & KPIs

NPS – Net Promoter Score: Measures how likely customers are to recommend your company.

Compliance & regulatory

MCMG – Medicare Communications and Marketing Guidelines: CMS-issued rules governing Medicare marketing.

NPRM – Notice of Proposed Rulemaking: Agency announcement of potential regulation changes.

PEI - Prior Express Invitation: Legally defined consent that allows a telemarketer or seller to call a consumer at a specific number.

PEWC – Prior Express Written Consent: Legally required permission before making certain automated calls or texts.

Tech & telephony

NLP – Natural Language Processing: Enables AI to interpret human speech and text.

PDD – Post Dial Delay: The time between the last digit of a phone number being dialed and the caller hearing the ringback tone. 

PBX – Private Branch Exchange: Internal phone system used for routing internal and external calls.

Operations & workforce/sales

MIA – Most Idle Agent: Agent waiting longest receives next call.

OPA – Off-Phone Activity: Time spent on non-calling tasks like training or emails.

PPC – Pay per Call: Advertising model that charges for qualified inbound calls.

PCP – Post-Call Processing: Time agents spend logging details and follow-ups after a call.

Q–S

Metrics & KPIs

ROI – Return on Investment: Evaluates profitability of tools, campaigns, or programs.

RTA – Real-Time Adherence: How closely agents stick to their schedules in real time.

Compliance & regulatory

RND – Reassigned Numbers Database: Designed to prevent a consumer from getting unwanted calls intended for someone who previously held their phone number.

STIR/SHAKEN – Secure Telephone Identity Revisited/Secure Handling of Asserted Information using toKENs: Caller ID authentication framework designed to combat spoofing and illegal robocalls. 

Tech & telephony

QoS – Quality of Service: Measures network reliability and call performance.

RPA – Robotic Process Automation: Uses bots to automate repetitive administrative work.

SA – Speech Analytics: Uses AI to analyze call recordings for patterns or compliance risks.

SaaS – Software as a Service: Cloud delivery model used by most contact center platforms.

SBR – Skills-Based Routing: Routes calls to the most qualified agent.

SIP – Session Initiation Protocol: Protocol for initiating and managing real-time communication sessions.

SMS – Short Message Service: Text messaging for outreach and notifications.

STT – Speech-to-Text: Technology that converts spoken language into text for Voice AI Agent workflows, transcription, and analysis.

Operations & workforce/sales

QA – Quality Assurance: Monitoring and scoring interactions to maintain standards.

QM – Quality Management: Broader process for performance improvement.

T–Z

Metrics & KPIs

TCO – Total Cost of Ownership: Full cost of a software or hardware investment.

Compliance & regulatory

TCFAPA – Telemarketing and Consumer Fraud and Abuse Prevention Act [1994]: Federal law addressing deceptive and abusive telemarketing practices. 

TCPA – Telephone Consumer Protection Act [1991]: U.S. federal law regulating certain automated and telemarketing calls and texts. 

TPMO – Third-Party Marketing Organization: Entity regulated under CMS rules for Medicare marketing.

TRACED Act – Telephone Robocall Abuse Criminal Enforcement and Deterrence Act: Expands penalties for illegal robocalls.

TSA – Telephone Solicitation Act: State laws regulating B2B and B2C outbound calls.

TSR – Telemarketing Sales Rule: FTC rule governing telemarketing practices, disclosures, and Do Not Call requirements. 

Tech & telephony

TSP – Telecommunications Service Priority: An FCC program that gives enrolled organizations priority for restoring or adding critical telecom services after a disruption. 

TTS – Text-to-Speech: Converts written text into spoken audio in IVR or AI applications.

UC / UCaaS – Unified Communications (as a Service): Combines voice, video, and chat into one system.

VAIA – Voice AI Agent: An agentic AI voice solution that engages and prequalifies leads through natural, responsive conversations before transferring qualified prospects to human agents.

VM – Voicemail: A system for recording and storing messages when a call isn’t answered; generally cloud-based rather than a physical answering machine.

VoIP – Voice over Internet Protocol: Enables phone calls via the internet.

Operations & workforce/sales

WFM – Workforce Management: Forecasts and schedules staff to meet service goals.

WFO – Workforce Optimization: Integrates analytics and training tools to boost efficiency.

VoC – Voice of the Customer: Captures customer feedback to improve experience.

Speaking the language of performance

Knowing the terminology helps you understand the metrics, workflows, and challenges that shape your outbound operation. 

But putting those ideas into practice takes the right software to turn insight into action.

Convoso is built for high-velocity sales teams that need to reach more leads, create more live conversations, and run outbound campaigns more efficiently. 

With high-performance dialing, campaign automation, and intelligent number management in one platform, you can manage more of your operation without stitching together separate tools.

See what better outbound performance can look like with Convoso.

DISCLAIMER: The information on this page, and related links, is provided for general education purposes only and is not legal advice. Convoso does not guarantee the accuracy or appropriateness of this information to your situation. You are solely responsible for using Convoso’s services in a legally compliant way and should consult your legal counsel for compliance advice.