> ## Documentation Index
> Fetch the complete documentation index at: https://docs.famulor.io/llms.txt
> Use this file to discover all available pages before exploring further.

# Definitions

> Useful terms and definitions for Famulor and voice AI applications

Useful terms and definitions for Famulor and voice AI applications.

## A

### AI Assistant / Agent

A configurable voice assistant that handles conversations via phone or chat. You configure behavior, tools, and voice in the Famulor platform.\
See [AI assistants](/en/ai-assistants/what-is-ai-assistant).

### At-cost

"At-cost" means without additional margin. In voice AI, this usually refers to direct model/provider usage fees.\
For your final pricing view, see [pricing](/en/pricing/overview).

### API Key

A secret token used to authenticate requests to an API. API keys should be stored securely, rotated regularly, and never exposed in public frontend code.

## B

### Backchanneling

Backchanneling is short listener feedback during a conversation, such as "okay", "right", or "I see".\
It helps conversations feel natural without changing the main intent of the message.

## C

### Campaign (Outbound)

A sequence or batch of outbound calls to leads or customer lists.\
See [campaigns](/en/outbound-calls/campaigns).

### Caller ID

The phone number shown to a recipient when your assistant places an outbound call.\
See [caller ID](/en/outbound-calls/caller-id).

### Conversation Ended Webhook

A webhook event sent when a chat conversation ends, including transcript and extracted variables.\
See [conversation ended webhook](/en/api-reference/webhooks/conversation-ended).

## D

### Data Residency

Data residency means data is stored and processed in a specific geography (for example, the EU).

### DPF (EU-U.S. Data Privacy Framework)

Legal transfer framework used for EU-U.S. data transfers for eligible certified organizations.

### DTMF

Dual-Tone Multi-Frequency: keypad tones during a call (for example "press 1") used by IVR and routing logic.

### DID (Direct Inward Dial)

A direct dial number that routes inbound calls to a target without going through a main switchboard.

## E

### Endpointing

See [speech endpointing](/en/glossary#speech-endpointing).

### E.164

International standard format for phone numbers (for example `+491701234567`) commonly required for telephony and messaging integrations.

## F

### FQDN

Fully Qualified Domain Name, often used for SIP and API endpoint configuration.

## G

### Gemini Flash Live

Name used for Gemini realtime models that can support speech-centric interactions (for example STT-adjacent live workflows via Vertex AI).

## I

### Inbound Call

A call received by your assistant from an external caller.\
See [inbound calls](/en/inbound-calls/overview).

### Inference

The process of running model computation (for example an LLM response) based on input context and prompts.

### ISO/IEC 27001:2022

International standard for Information Security Management Systems (ISMS).

## K

### Knowledge Base

A curated set of documents your assistant can use to answer with better context and consistency.\
See [knowledge bases](/en/conversation-design/knowledge-bases).

## L

### Large Language Model

Large Language Models (LLMs) are ML models trained on large text corpora and used to generate text token by token.

### LLM

Abbreviation for [Large Language Model](/en/glossary#large-language-model).

## M

### Mid-Call Tool

A tool your assistant can invoke during an active conversation to fetch data or trigger actions in external systems.\
See [mid-call tools](/en/automation-platform/mid-call-tools/was-sind-mid-call-tools). For whole external toolsets (HubSpot, CRM, APIs) connected in one step, see [MCP Servers](/en/platform/mcp-servers).

### MFA

Multi-Factor Authentication: a multi-step login flow (for example password + one-time code) to improve account security.

## N

### No-Code Automation Platform

Famulor's visual workflow system for automating triggers and actions without writing code.\
See [automation platform](/en/automation-platform/introduction).

## O

### OpenAI GPT OSS

Open-source model family from OpenAI that can be operated in Famulor via Azure environments depending on setup.

### OAuth

Authorization standard that lets users grant limited access to external services without sharing passwords.

### Outbound Call

A call initiated by your assistant to an external number.\
See [outbound calls](/en/outbound-calls/overview).

## P

### Provisioning

Provisioning is the setup process for telephony resources (numbers, SIP setup, routing, and compliance-related requirements).\
See [number provisioning](/en/provisioning/supported-countries).

### PBX

Private Branch Exchange: a company phone system for internal and external call routing.

### PHI

Protected Health Information: sensitive health-related data in HIPAA-regulated contexts.

### PSTN

Public Switched Telephone Network: traditional public telephone network for landline/mobile telephony.

## R

### Rate Limit

Technical limit on how many API requests are allowed within a time window.

### Retry Strategy

Defined policy for re-attempting failed actions (for example message delivery or call attempts).

## S

### SDK

Software Development Kit. A packaged set of libraries and tools that helps developers integrate faster.

### SOC 2 Type 2

Audit standard that evaluates the operational effectiveness of security controls over a period of time.

### Server URL

A server endpoint your application exposes so automation or runtime events can be sent to your backend in real time.\
See [automation webhook API](/en/automation/webhook-api).

### Speech Endpointing

Speech endpointing is the detection of where speech starts and ends in an audio stream.\
Good endpointing helps avoid interrupting users too early and improves turn-taking quality.

### SIP Trunk

A SIP trunk connects telephony infrastructure (for example a PBX) to external voice services via the SIP protocol.

### SSO

Single Sign-On: one login used to access multiple connected systems.

### SCC (Standard Contractual Clauses)

EU-provided contractual clauses used for international data transfers.

### STT

Abbreviation for Speech-to-Text: converting spoken audio into text.

### SST

Common typo for [STT](/en/glossary#stt).

## T

### Telemarketing Sales Rule

A US regulation governing telemarketing behavior and consumer protection.\
If you run outbound calling programs, ensure your legal/compliance team validates your process for each target region.

### TTS

Abbreviation for Text-to-Speech: converting text into playable audio.

## V

### Voice-to-Voice Latency

The time between a user finishing speech and the assistant starting audio playback.\
This is a core quality metric for real-time voice AI.

### VoIP

Voice over IP: telephony over IP-based networks instead of traditional circuit-switched lines.

## W

### WhatsApp Business Platform

The technical WhatsApp integration for businesses. In Famulor, this can be connected via Twilio, either with an owned verified number or a number from the Famulor pool.

### Webhook

A webhook is an HTTP endpoint that receives event data from external systems.\
In many patterns it is unidirectional: receiver acknowledges with a status code.\
See [post-call webhook](/en/api-reference/webhooks/post-call).