Glossary
Voice AI Glossary
The vocabulary of production voice agents — from turn detection to SIP trunks — defined in plain English, with the engineering context that makes each term matter.
Barge-in
Barge-in is the ability of a caller to interrupt a voice AI agent while it is speaking, with the agent stopping its audio and listening immediately.
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BYOC (Bring Your Own Carrier)
BYOC (Bring Your Own Carrier) lets you connect your existing telecom carrier to a voice AI platform over SIP trunking, keeping your contracts, rates, phone numbers, and regulatory compliance.
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DID Number
A DID (Direct Inward Dialing) number is a phone number that routes callers directly to a specific endpoint — such as a voice AI agent — without going through a switchboard or extension menu.
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Endpointing
Endpointing is how a voice AI agent decides that a caller has finished speaking and it is the agent's turn to respond — the difference between interrupting callers and leaving dead air.
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SIP Trunking
SIP trunking carries voice calls over an IP network using the Session Initiation Protocol, replacing physical phone lines — it's how carriers, PBXs, and voice AI platforms connect to each other.
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Time to First Audio (TTFA)
Time to first audio (TTFA) is the elapsed time from when a caller stops speaking to when they hear the first audio of the voice AI agent's reply — the honest measure of voice AI latency.
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Voice Activity Detection (VAD)
Voice activity detection (VAD) is the technique a voice AI system uses to distinguish human speech from silence and background noise in an audio stream, in real time.
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Warm Transfer
A warm transfer is a call handoff in which the voice AI agent briefs the human agent — context, caller identity, and conversation summary — before connecting the caller, so nobody has to repeat themselves.
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