Glossary · 68 terms
AI receptionists & phone automation, explained
Plain-English definitions of the terms behind modern small-business call handling — what they mean, how they work, and how they fit together.
A
after-hours answering service
An after-hours answering service handles calls that come in outside business hours — evenings, weekends, and holidays. It answers, captures the caller's need, books or schedules where possible, and flags anything urgent so nothing waits until the next morning.
AI receptionist
An AI receptionist is software that answers a business's phone calls with a natural-sounding voice, understands what the caller needs, and handles it — answering questions, booking appointments, taking messages, or routing the call — without a human picking up. It runs 24/7 and can handle many calls at once.
answering service
An answering service handles incoming calls on a business's behalf — answering, taking messages, and relaying them to the team. Traditionally staffed by remote agents and billed per minute, answering services are increasingly automated with voice AI.
Appointment reminder
An appointment reminder is an automated message sent to a customer ahead of a scheduled appointment to prompt them to attend or reschedule. Reminders are commonly delivered by text message, email, or automated phone call. Their main purpose is to reduce missed appointments and keep schedules running smoothly.
appointment scheduling
Appointment scheduling is the process of booking customers into available time slots — by phone, online, or automatically — and syncing those bookings to a calendar so the business and the customer both have it confirmed.
Auto attendant
An auto attendant is an automated phone-system feature that answers incoming calls and routes them without a live operator. It greets callers with a recorded message and presents a menu of options—such as pressing a number for sales, support, or a specific department—then directs each call to the right extension, group, or voicemail. Auto attendants let organizations of any size handle calls consistently around the clock.
Automatic speech recognition (ASR)
Automatic speech recognition (ASR) is technology that converts spoken language into written text. It captures an audio signal, analyzes its acoustic patterns, and outputs the most likely sequence of words. ASR is the listening component that lets computers, phones, and voice assistants understand what a caller says.
Average handle time
Average handle time (AHT) is the average total duration of a customer interaction, including talk time, any hold time during the call, and the after-call work needed to wrap it up. It is usually reported in minutes and seconds and is a standard efficiency metric in phone-based service. AHT helps managers understand how long calls take and plan staffing accordingly.
Average speed of answer
Average speed of answer (ASA) is the average time it takes for inbound calls to be answered by an agent, measured from when the call enters the queue until it is picked up. It is usually expressed in seconds and is a core metric for phone-based customer service. A lower ASA means callers spend less time waiting before someone helps them.
B
Barge-in
Barge-in is a feature that lets a caller interrupt a system's spoken prompt and be heard immediately, without waiting for it to finish. When barge-in is enabled, speaking over the assistant stops its playback and starts listening. It makes voice interactions feel more natural and responsive.
Bilingual answering
Bilingual answering is a phone-answering service that can handle calls in two languages, so callers can be served in the language they are most comfortable with. It commonly pairs a primary language with a second widely spoken one in the business's market. The aim is to serve a broader customer base without language becoming a barrier.
business phone system
A business phone system is the setup a company uses to make and receive calls — from a traditional landline or PBX to cloud-based VoIP — often including extensions, voicemail, call routing, and an auto attendant.
C
Call abandonment rate
Call abandonment rate is the percentage of inbound callers who hang up before reaching a live agent, usually while waiting in a queue or on hold. It is calculated by dividing the number of abandoned calls by the total number of calls offered, then multiplying by 100. A high abandonment rate signals that callers are waiting too long and may indicate understaffing or inefficient routing.
Call analytics
Call analytics is the collection and analysis of data about phone calls to understand performance, customer behavior, and marketing effectiveness. It covers both operational metrics—like volume, wait times, and abandonment—and content-level insights drawn from recordings and transcripts. Businesses use call analytics to improve service, staffing, and campaign decisions.
Call deflection
Call deflection is the practice of resolving or redirecting a customer's need through an alternative channel so the interaction never requires a live phone agent. Instead of routing every caller to a person, systems offer self-service options—such as an automated answer, a text message, a knowledge-base link, or a callback—that satisfy the request. The goal is to reduce agent call volume while still helping the customer.
call forwarding
Call forwarding automatically redirects an incoming call from one number to another — for example, sending calls from a business line to a mobile, an answering service, or an AI receptionist when the main line isn't picked up.
call overflow handling
Call overflow handling catches calls that can't be answered because the line is busy or staff are occupied. Overflow calls are routed to a backup — an answering service, a voicemail-to-text system, or an AI receptionist — so callers reach a response instead of a busy signal.
Call queue
A call queue is a holding line where inbound callers wait, usually in the order they arrived, until an agent becomes available to answer. When all agents are busy, the phone system places new callers in the queue and connects them one by one as lines free up. Queues typically play music or messages while callers wait and are a core feature of business phone systems and contact centers.
Call recording
Call recording is the practice of capturing and storing audio of a phone conversation for later playback or analysis. Businesses record calls for quality assurance, training, dispute resolution, and compliance. Because recording involves capturing people's voices, it is governed by consent laws that vary by jurisdiction.
call routing
Call routing is the logic that directs an incoming call to the right destination — a person, department, queue, or system — based on rules like who's available, what the caller needs, or the time of day.
call screening
Call screening identifies and filters incoming calls before they're answered — checking who's calling and why — so a business can prioritize real customers, route the call appropriately, and keep spam and robocalls from interrupting staff.
Call tracking
Call tracking is the practice of measuring and analyzing inbound phone calls to understand where callers come from and what happens on the call. It often uses unique phone numbers assigned to different ads, pages, or campaigns to attribute each call to its source. This lets a business see which marketing efforts actually generate phone inquiries.
Call whisper
A call whisper is a short automated message played only to the person answering a call—not to the caller—just before the two are connected. It gives the answering agent context, such as which campaign or number the call came in on, so they can respond appropriately. The caller hears nothing during the whisper and only the ring or brief hold.
Caller ID
Caller ID is a telephone feature that displays the phone number—and often the name—of an incoming caller before the call is answered. The information is transmitted by the phone network to the recipient's device or system. Caller ID helps people and businesses decide how to handle a call and is widely used for screening and routing.
Cloud phone system
A cloud phone system is a business phone service hosted and managed by a provider over the internet rather than on hardware at your office. It delivers calling and phone features through the cloud, accessible from many devices. It is also known as hosted PBX or cloud PBX.
Cold transfer
A cold transfer, also called a blind transfer, is a call transfer in which the caller is sent directly to another agent or department without any introduction or briefing. The original agent connects the call and hangs up immediately, without speaking to the receiving party first. It is fast but means the new agent receives the call with no context.
conversational AI
Conversational AI is software that understands and responds to human language in a natural, back-and-forth way — over voice or text. It powers chatbots and voice assistants that can answer questions, take actions, and hold a real dialogue.
Conversion rate
A conversion rate is the percentage of people who take a desired action out of the total number who had the opportunity to. The action might be booking an appointment, making a purchase, or filling out a form. It is a core measure of how effectively a business turns interest into results.
Cost per lead
Cost per lead (CPL) is a marketing metric that measures how much a business spends, on average, to generate one new lead. It is calculated by dividing total spending on a campaign or channel by the number of leads it produced. CPL helps a business judge whether its marketing is efficient and which channels deliver leads most affordably.
CRM (customer relationship management)
A CRM, or customer relationship management system, is software that stores and organizes a business's interactions and information about its customers and leads in one place. It typically tracks contact details, communication history, deals, and follow-up tasks. The goal is to help a business build stronger relationships and avoid letting opportunities slip through the cracks.
Customer lifetime value (CLV)
Customer lifetime value (CLV) is the total revenue or profit a business can expect from a single customer over the entire length of their relationship. It looks beyond a first purchase to include repeat business over time. CLV helps a business decide how much it can reasonably spend to acquire and keep customers.
D
Double-booking
Double-booking is a scheduling error in which two appointments or reservations are assigned to the same resource, staff member, or time slot when only one can be served. It creates a conflict where at least one customer cannot be accommodated as promised. It commonly results from calendars that are not synchronized or updated in real time.
DTMF (touch-tone)
DTMF, or dual-tone multi-frequency, is the signaling system behind touch-tone telephones, where each key press produces a distinct tone that the phone network can recognize. Each button generates two simultaneous frequencies, and the specific combination identifies which key was pressed. DTMF is what lets callers navigate phone menus by pressing numbers.
I
Inbound call
An inbound call is a phone call that a customer or contact initiates to a business, rather than one the business places out. These calls are typically received by a receptionist, phone system, or answering service. Common reasons for inbound calls include questions, support requests, and booking appointments.
Intent detection
Intent detection is the process of identifying what a user is trying to accomplish from what they say or type. It maps a natural-language message to a predefined goal, such as booking an appointment or asking about pricing. Intent detection lets automated systems choose the right action or response.
IVR (interactive voice response)
IVR, or interactive voice response, is the automated phone menu that asks callers to press a number or say a word to route their call ("Press 1 for sales"). It's the traditional way businesses direct calls without a live operator.
L
Large language model (LLM)
A large language model (LLM) is a type of AI model trained on vast amounts of text to predict and generate human-like language. It learns statistical patterns in words and can answer questions, summarize, translate, and hold conversations. LLMs power many modern chatbots and voice assistants by generating context-aware responses.
Latency (in voice AI)
Latency in voice AI is the delay between when a caller finishes speaking and when the system responds. It is measured in milliseconds and accumulates across each processing step. Low latency is essential for conversations that feel natural rather than awkward.
lead qualification
Lead qualification is the process of determining whether a prospect is a good fit and worth pursuing — gathering details like their need, timeline, and budget so a business spends time on the leads most likely to convert.
Lead response time
Lead response time is how long it takes a business to respond to a new prospective customer after they first make contact, such as submitting a form, calling, or sending a message. It is measured from the moment the lead arrives to the first meaningful reply. Faster response times are generally associated with a better chance of connecting with and winning the lead.
N
natural language understanding
Natural language understanding (NLU) is the part of AI that works out what a person actually means from their words — extracting intent and key details from a sentence, even when it's phrased casually or incompletely.
No-show
A no-show is when a customer with a scheduled appointment fails to attend and does not cancel or reschedule in advance. The reserved time is left unused, and the business often cannot fill it on short notice. No-shows represent lost time and revenue for appointment-based businesses.
O
Online booking
Online booking is a system that lets customers schedule appointments or services themselves through a website, app, or link, without calling or emailing a business. It shows real-time availability and confirms the reservation instantly. Bookings are recorded on the business's calendar automatically.
Outbound call
An outbound call is a phone call that a business places to a customer, lead, or contact, rather than one it receives. Businesses make outbound calls for purposes like following up on inquiries, confirming appointments, collecting feedback, or reaching out to prospects. It is the counterpart to an inbound call, which the customer initiates.
S
Sentiment analysis
Sentiment analysis is the use of AI to determine the emotional tone behind a piece of text or speech. It classifies input as positive, negative, or neutral, and sometimes detects specific emotions like frustration. In voice systems it helps gauge how a caller feels during a conversation.
SIP trunking
SIP trunking is a method of delivering phone service over the internet using the Session Initiation Protocol. It provides virtual phone lines, or trunks, that connect a business phone system to the public telephone network. SIP trunks replace traditional physical phone lines with internet-based connections.
Softphone
A softphone is software that lets you make and receive phone calls from a computer, tablet, or smartphone instead of a physical desk phone. It uses VoIP to connect calls over the internet. A softphone turns any suitable device into a full-featured phone.
Spam call filtering
Spam call filtering is the process of detecting and blocking or flagging unwanted phone calls, such as robocalls, telemarketing, and scam attempts, before they reach or distract the recipient. It uses signals like known bad numbers, calling patterns, and caller verification to identify likely spam. The goal is to reduce interruptions so genuine calls get through.
speech-to-text
Speech-to-text (STT), also called speech recognition, converts spoken audio into written text. It's the first step in a voice AI system: turning what a caller says into text a language model can understand.
speed to lead
Speed to lead is how fast a business responds to a new inquiry — a call, form, or message. The faster the response, the more likely the lead converts, because interest fades quickly and prospects often contact several businesses at once.
T
text-to-speech
Text-to-speech (TTS) converts written text into spoken audio with a synthetic voice. In a voice AI system, it's the final step: turning the assistant's chosen response into natural-sounding speech the caller hears.
Toll-free number
A toll-free number is a telephone number that lets callers reach a business without being charged for the call; instead, the business that owns the number pays the cost. In North America, toll-free numbers use recognizable prefixes such as 800, 888, 877, 866, 855, 844, and 833. They are commonly used for customer service and sales lines to encourage people to call.
Turn-taking (in conversational AI)
Turn-taking is the process of managing when each party speaks and listens during a conversation. In conversational AI, it means detecting when a caller has finished so the system can respond at the right moment. Good turn-taking makes spoken interactions feel smooth and natural.
V
virtual receptionist
A virtual receptionist answers and handles a business's calls remotely instead of from the front desk. It can be a live remote agent, an AI voice assistant, or a mix — greeting callers, scheduling, taking messages, and routing calls.
voice AI agent
A voice AI agent is software that holds a spoken, back-and-forth conversation in real time. It listens, understands intent with a language model, and replies in a natural voice — and can take actions like booking, transferring, or sending a text mid-conversation.
Voice biometrics
Voice biometrics is technology that identifies or verifies a person based on the unique characteristics of their voice. It creates a voiceprint from measurable vocal traits and compares new audio against it. It is used to authenticate callers without passwords or PINs.
Voice cloning
Voice cloning is the use of AI to create a synthetic copy of a specific person's voice from recorded samples. The resulting model can generate new speech that sounds like that individual. It is a specialized form of text-to-speech focused on replicating a particular voice.
VoIP
VoIP, or Voice over Internet Protocol, is technology that carries voice calls over the internet instead of traditional phone lines. It converts speech into digital data packets and transmits them across IP networks. VoIP underpins most modern business phone systems and internet calling apps.
W
Wake word
A wake word is a specific spoken phrase that activates a voice assistant and tells it to start listening for a command. Until it hears the wake word, the device stays in a low-power standby state. Common examples are the phrases used to summon smart speakers and phone assistants.
Warm transfer
A warm transfer is a call transfer in which the first agent speaks with the receiving agent before handing over the caller, briefing them on who is calling and why. The original agent stays on the line long enough to introduce the caller and share context, then drops off once the new agent is ready. This creates a smoother handoff than simply redirecting the call.