Glossary
Plain definitions for the vocabulary that shows up on answering service quotes and phone system invoices.
Most of the confusion in this field is vocabulary. A warm transfer is not a cold one, call deflection is not call avoidance, and an auto attendant is not a receptionist.
What Are AI Guardrails?
Guardrails are the limits that stop an AI system doing things it should not. Here is the difference between asking and enforcing.
What Are Concurrent Calls?
Concurrent calls are calls happening at the same time. Your line's channel limit is usually the real ceiling, not whatever is answering them.
What Is a BAA (Business Associate Agreement)?
A BAA is the contract that lets a vendor handle protected health information. It has to cover every layer of the stack, down to the last subprocessor.
What Is a Call Detail Record?
A call detail record is the metadata line your phone system writes for every call. Here is what it holds, what it does not, and what it is used for.
What Is a Call Greeting?
A greeting is the first thing a caller hears, and it sets the whole call. Here is what belongs in it and what does not.
What Is a Call Script?
A call script is the wording a receptionist or assistant follows. Here is what changes when it is read by software.
What Is a Call Summary?
A call summary condenses a conversation into a few lines you can skim. It is for triage, not for acting on, because it inherits every transcript error.
What Is a Call Transcript?
A transcript is the written record of what was said on a call, both sides. It is the artifact worth reading, and the one that improves your setup.
What Is a Codec in Phone Calls?
A codec compresses voice so it fits down a connection, then rebuilds it at the other end. The choice sets how your calls sound and how much data they use.
What Is a Cold Transfer?
A cold transfer connects the caller with no context, so they start over. It is fast, and it is the wrong choice for anything urgent.
What Is a CRM Integration?
A CRM integration writes what happened on a call into your customer records. Here is the question that separates real ones from listed ones.
What Is a DID Number?
A DID is a phone number that reaches a specific destination directly, without going through a switchboard. It is how extra numbers get added cheaply.
What Is a Hosted PBX?
A hosted PBX runs your phone system on a provider's servers instead of hardware you own. Here is what you gain, and the two things you give up.
What Is a Knowledge Base?
A knowledge base is the collected answers a system or team works from. Here is why the gaps in it cost more than the size.
What Is a Missed Call?
A missed call is one nobody answered. The ones that leave no message are the expensive ones, because you never learn what the caller wanted.
What Is a No-Show?
A no-show is a booked appointment nobody attends and nobody canceled. Reminders and deposits reduce it; the percentages vendors quote are unsourced.
What Is a PBX?
A PBX is the switchboard that routes calls inside a business and out to the phone network. Here is what it does and when you still need one.
What Is a Prompt in AI Systems?
A prompt is the instruction that tells an AI system how to behave. Here is what makes one work on a phone call.
What Is a Retry Policy?
A retry policy decides when a failed request is attempted again and how often. Here is which failures deserve a retry and which do not.
What Is a Robocall?
A robocall plays a recorded or synthetic voice to someone who did not ask for it. The rules govern placing them, not answering your own phone.
What Is a Service Level Agreement?
A service level agreement is a contract promising measurable performance with a penalty attached. Here is what makes one real and what makes it decoration.
What Is a SIP Trunk?
A SIP trunk is the internet connection that carries calls between your phone system and the public network. Here is how it is sold and sized.
What Is a Softphone?
A softphone is calling software on a computer or mobile instead of a desk handset. Here is what changes when the phone becomes an app.
What Is a Spam Call?
A spam call is an unwanted call, automated or not. On per-call billing they cost money, so carrier blocking is worth switching on first.
What Is a Subprocessor?
A subprocessor is a third party your vendor uses that touches your data. Here is why the list matters more than the vendor's own policy.
What Is a Synthetic Voice?
A synthetic voice is speech generated by software rather than recorded from a person. Here is what changed and what the law now asks of it.
What Is a UTM Parameter?
UTM parameters are tags added to a link so analytics knows where a visitor came from. Here is the naming discipline that keeps them useful.
What Is a Vanity Number?
A vanity number spells a word on the keypad so people remember it. Here is what it is worth now that almost nobody dials by hand.
What Is a Virtual Number?
A virtual number is a phone number with no fixed line behind it, forwarded wherever you choose. Here is what it is genuinely useful for.
What Is a Virtual Receptionist?
A virtual receptionist answers your calls from somewhere other than your office. The word covers both remote humans and software, which is why quotes vary so much.
What Is a Wake Word?
A wake word is the phrase that tells a device to start listening properly. Here is why a phone assistant does not need one.
What Is a Warm Transfer?
A warm transfer passes the caller's context to whoever picks up, so they do not repeat themselves. Here is when the extra seconds are worth spending.
What Is a Webhook?
A webhook pushes a message to your system the moment something happens. Here is why the delivery guarantees matter.
What Is After-Hours Answering?
After-hours answering covers calls outside opening times. Those callers rarely leave voicemail, which is why the coverage often pays for itself.
What Is an Abandoned Call?
An abandoned call is one the caller hung up on before reaching anyone. It is the most under-measured number in most small businesses.
What Is an Access Log?
An access log records who viewed what and when. Here is why reading one matters far more than having one, and what to do when nobody ever does.
What Is an AI Hallucination?
A hallucination is a confident, fluent answer that is simply untrue. Here is why it is worse on a phone call than in writing.
What Is an AI Receptionist?
An AI receptionist answers your inbound calls, holds a conversation, books appointments and passes on what it could not handle. Here is what it does and does not do.
What Is an Answering Service?
An answering service picks up your calls for you, traditionally with staffed operators. Pricing runs $165 to $1,950 a month, checked September 2026.
What Is an API?
An API is the defined way one piece of software talks to another. Here is what to check before you count on one.
What Is an Audit Trail?
An audit trail is a tamper-resistant record of what changed, by whom and when. Here is what separates one from an ordinary log.
What Is an Auto Attendant?
An auto attendant answers and directs calls without a person, usually with a recorded menu. Here is how it differs from IVR and from an AI receptionist.
What Is an Escalation Path?
An escalation path is the written rule for what happens when the first answer is not enough. Every step needs a fallback, including the last one.
What Is Appointment Booking on a Call?
Booking on a call means the caller hangs up with a confirmed time, not a promise. The test is whether the system reads real availability.
What Is Barge-In on a Phone Call?
Barge-in lets a caller interrupt the system mid-sentence and be heard. Without it, callers talk over a greeting that keeps playing regardless.
What Is Business Continuity?
Business continuity is keeping the business trading through a disruption rather than restoring systems afterwards. Here is the phone-first version.
What Is Calendar Sync?
Calendar sync keeps your booking system and your calendar in agreement. One-way and two-way are different products, and the difference matters.
What Is Call Abandonment Rate?
Call abandonment rate is the share of callers who hang up before anyone answers. Here is how it is counted, and why the number flatters most phone lines.
What Is Call Analytics?
Call analytics turns your phone log into something you can act on. Here is what the metadata can show and where it stops being useful.
What Is Call Deflection?
Call deflection moves a caller to a cheaper channel or answers them without a person. Done badly it is just a wall between customers and help.
What Is Call Forwarding?
Call forwarding sends calls from your number to another one. It is a carrier setting, not an install, and it is how an AI receptionist reaches your existing line.
What Is Call Recording?
Call recording saves the audio of a phone call. Consent rules vary by state and published lists disagree, so disclosure on every call is the safe posture.
What Is Call Routing?
Call routing decides where each call goes: which person, which number, which rule. Here is how to route by need rather than by department.
What Is Call Screening?
Call screening finds out who is calling and why before you take the call. Here is the difference between screening, blocking and simply not answering.
What Is Call Tracking?
Call tracking ties a phone call back to the advert or page that produced it. Here is how the numbers work and what breaks the chain.
What Is Code-Switching on Calls?
Code-switching is moving between languages inside one conversation or sentence. Here is why it defeats most language settings.
What Is Conversation Design?
Conversation design is planning how a spoken exchange should go. Here is what changes when the interface has no screen.
What Is Conversational Latency?
Conversational latency is the gap between a caller finishing and the assistant replying. Here is what makes up that delay.
What Is Conversion Tracking?
Conversion tracking records the actions you care about so spending can be judged. Here is how to define one so the number stays honest.
What Is CRM Sync?
CRM sync keeps records matching across two systems, in one or both directions. Here is what happens when both sides change.
What Is Data Residency?
Data residency is about which country your data physically sits in. Here is why the answer is rarely a single place.
What Is Data Retention?
Data retention is how long records are kept before deletion. Here is why a shorter period is usually the safer setting.
What Is Diarization in Transcripts?
Diarization labels who said which part of a transcript. Here is why the attribution matters on a call record, and where the labels get confused.
What Is Disaster Recovery?
Disaster recovery is the plan for restoring service after something serious breaks. Here is the phone-specific version of it.
What Is Double Booking?
Double booking is two appointments in one slot. It is usually a sync problem rather than a mistake, and the fix is reading availability live.
What Is Dynamic Number Insertion?
Dynamic number insertion swaps the phone number on your website based on how the visitor arrived. Here is what it measures and what it costs.
What Is Encryption at Rest?
Encryption at rest protects stored data from someone who gets hold of the disk. Here is the threat it covers and the one it does not.
What Is Encryption in Transit?
Encryption in transit protects data while it moves across a network. Here is why phone calls are the awkward case.
What Is End-of-Turn Detection?
End-of-turn detection judges when a caller has finished speaking so the assistant can reply. Here is why silence alone is a poor signal.
What Is Find-Me-Follow-Me?
Find-me-follow-me chases one person across their phones in sequence. Here is why the total wait is longer than people expect.
What Is First Call Resolution?
First call resolution is the share of callers who get what they needed without calling back. It is a useful measure and an easy one to game.
What Is First-Touch Attribution?
First-touch attribution gives all the credit to whatever introduced the customer to you. Here is what it reveals and what it badly overstates.
What Is Geographic Routing?
Geographic routing sends a call to a branch based on where the caller is dialing from. Here is why the area code lies more than it used to.
What Is HIPAA?
HIPAA is the US law protecting health information. It is a compliance regime, not a certification, which is why no product can be certified under it.
What Is Human in the Loop?
Human in the loop keeps a person involved in decisions an AI system makes. Here is the difference between reviewing and rubber-stamping.
What Is Idempotency?
An idempotent operation gives the same result whether it runs once or five times. Here is why bookings need it.
What Is Intent Detection?
Intent detection works out what a caller wants from what they said. It is what lets an assistant route a call without making anyone press a number.
What Is Interruption Handling?
Interruption handling decides what an assistant does when a caller talks over it. Here is why the two obvious settings both fail.
What Is IVR (Interactive Voice Response)?
IVR is the press-one-for-sales menu. It routes reliably and frustrates callers who do not fit its options. Here is where it still beats a conversation.
What Is Jitter on a Phone Call?
Jitter is uneven arrival timing for the packets carrying your call. It causes choppy audio even when nothing is lost, and here is how to spot it.
What Is Language Detection on Calls?
Language detection works out which language a caller is speaking so the system can respond in it. Here is why the first seconds are hardest.
What Is Last-Touch Attribution?
Last-touch attribution credits whatever happened immediately before the sale. Here is why it is the default and what it quietly kills.
What Is Latency on an AI Phone Call?
Latency is the delay between a caller finishing and the assistant replying. It shapes how natural a call feels more than the voice does.
What Is Lead Qualification?
Lead qualification works out which inquiries are worth pursuing first. On a phone call, fewer questions asked well beat a long checklist.
What Is Lead Routing?
Lead routing decides which salesperson gets a new inquiry. Here is what the rules usually optimize for and what speed is worth.
What Is Load Balancing?
Load balancing spreads work across several servers so no single one is overwhelmed. Here is how it relates to phone capacity.
What Is Local Presence in Phone Numbers?
Local presence means showing a number with the caller's own area code. Here is the inbound version, which is the honest one.
What Is Marketing Attribution?
Attribution assigns credit for a sale to the marketing that produced it. Here is why every model is wrong and which wrongness to pick.
What Is Number Masking?
Number masking puts a proxy number between two people so neither sees the other's real one. Here is where it protects and where it irritates.
What Is Overflow Routing?
Overflow routing catches calls the first destination could not take. Here is how the trigger is set and why the second destination matters more.
What Is Packet Loss on a Call?
Packet loss is audio that never arrives, so words drop out of the call entirely. Here is what causes it and why 1% already sounds bad.
What Is PHI?
PHI is health information tied to an identifiable person and handled by a covered entity. Here is what that means for a phone line.
What Is PII?
PII is information that identifies a specific person, alone or combined with something else. Here is why phone calls are full of it.
What Is Prosody in Speech?
Prosody is the rhythm, stress and pitch of speech, and it carries meaning the words do not. Here is why it is the hard part of synthesis.
What Is Rate Limiting?
Rate limiting caps how many requests a system will accept in a window. Here is what it protects and how it shows up as a bug.
What Is Recovery Point Objective?
Recovery point objective is how much data you can afford to lose in a failure. Here is how the number gets set honestly.
What Is Recovery Time Objective?
Recovery time objective is how long you can be down before the damage is unacceptable. Here is why phones get their own answer.
What Is Redaction in Call Records?
Redaction removes sensitive details from transcripts and recordings before they are stored. Here is what it catches and what it misses.
What Is Role-Based Access Control?
Role-based access grants permissions to roles rather than to individuals. Here is how it keeps drifting toward everyone being an admin.
What Is Round-Robin Routing?
Round-robin routing sends each new call to the next person in a list, then starts over. Here is where it distributes fairly and where it hides a problem.
What Is Silence Detection on a Call?
Silence detection decides how long an assistant waits before assuming the caller has finished. Here is the trade-off behind that timer.
What Is Simultaneous Ring?
Simultaneous ring makes several phones ring at once so the fastest person wins. Here is what it costs in attention and how to keep it usable.
What Is Single Sign-On?
Single sign-on lets one identity open every tool. Here is the offboarding argument for it, which is the real one.
What Is SIP (Session Initiation Protocol)?
SIP is the protocol that sets up and ends internet phone calls. You rarely touch it directly, but it is why VoIP call limits exist.
What Is Skills-Based Routing?
Skills-based routing matches a caller to whoever can actually help, not whoever is next. Here is what it needs to work and how it fails.
What Is Speech Recognition Accuracy?
Speech recognition accuracy is how much of what was said the system got right. Here is why published figures rarely match your phone line.
What Is Speech-to-Text?
Speech-to-text converts spoken audio into written words. It is the first step on every AI call, and where it slips is predictable: names, numbers and noise.
What Is SSML?
SSML is markup telling a speech engine how to say something, beyond what to say. Here is what it controls and when it is worth using.
What Is STIR/SHAKEN?
STIR/SHAKEN signs caller ID so carriers can tell whether it was spoofed. It attests to the number, never to whether the call is wanted.
What Is Streaming Text to Speech?
Streaming text to speech starts talking before the whole sentence is generated. Here is what it buys and the one thing it breaks.
What Is Tenant Isolation?
Tenant isolation keeps one customer's data separated from another's in shared software. Here is what the models are and how they fail.
What Is Text-to-Speech?
Text-to-speech turns written words into spoken audio. It is the voice your callers hear, and the script matters more than which voice you pick.
What Is the PSTN?
The PSTN is the traditional switched telephone network. It still carries calls and still sets the audio quality limits everyone works within.
What Is the TCPA?
The TCPA governs calls placed to consumers, not calls they place to you. Here is why it rarely reaches an inbound AI receptionist, and what does.
What Is Time to First Byte?
Time to first byte measures how long a system waits before any response starts arriving. Here is how it applies to a voice call.
What Is Time-of-Day Routing?
Time-of-day routing sends calls to different places depending on the hour and the day. Here is how to set the boundaries so nothing falls through.
What Is Turn-Taking on an AI Call?
Turn-taking is knowing when the caller has finished and it is your turn. Getting it wrong is what makes an AI call feel wrong, more than the voice does.
What Is Two-Party Consent?
Two-party consent means everyone on a call must agree before it is recorded. Which states require it is genuinely disputed, so disclosure is the safe default.
What Is Voice Cloning?
Voice cloning builds a synthetic copy of a specific person's voice from samples. Here is what consent and disclosure require of it.
What Is Voicemail Transcription?
Voicemail transcription turns a recorded message into text you can read. It makes messages skimmable but does nothing about the callers who never leave one.
What Is VoIP?
VoIP carries phone calls over the internet instead of copper lines. It is why extra numbers and simultaneous calls became cheap to add.
What Is Word Error Rate?
Word error rate counts substitutions, deletions and insertions against what was actually said. Here is why a low rate can still read badly.
What Is Zapier?
Zapier connects apps that have no direct integration, without code. Here is what it costs in reliability and money.
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