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Glossary · Voice technology

What is IVR (interactive voice response)?

  • Also called: interactive voice response, phone tree, voice response system

Reviewed by Sujan ThapaliyaLast updated

Definition

An IVR is an automated phone system that plays prompts and acts on the caller's keypresses or speech — routing them, looking something up, taking a payment, or booking a slot. It handles the call rather than just directing it.
The three STIR/SHAKEN attestation levels, which underpin how ivr (interactive voice response) behaves in practice: A asserts both that the carrier knows the customer and that the customer may use the calling number, B asserts the customer only, and C asserts neither. A shared number pool can reach B at best, which is why number ownership keeps recurring in these definitions.
Attestation is the backdrop to most caller-ID and deliverability terms, ivr (interactive voice response) included.

In practice

How ivr (interactive voice response) actually works

The economics are straightforward: any call an IVR completes without an agent costs a fraction of one that does not. The trap is measuring containment without measuring what happens next, because a caller who abandons the IVR and rings back has been counted as contained.

Speech-driven IVR removes the menu depth problem by letting the caller say what they want, which is also what a well-built AI voice agent does — the difference is that the agent can handle an answer the designer did not anticipate.

Every IVR should be measured on completion rate and on repeat-call rate together. One without the other flatters the system.

Worked example

Containment of 62% looks excellent until you notice a repeat-call rate of 18% — a third of the contained calls came back. Containment without the repeat figure flatters every IVR ever built.

IVR (interactive voice response): common questions

What is a phone tree?
The everyday name for an IVR menu structure — the branching set of options a caller works through. The term is usually used when the branching has become deep enough to be annoying.
Do callers hate IVRs?
They hate long ones with no exit. Callers accept a short menu that gets them to the right place quickly, and they accept an automated system that actually completes the task. What they reject is a maze.
Can an AI voice agent replace an IVR?
For many inbound lines, yes. The agent asks what the caller needs in plain language and acts on the answer, which removes the menu entirely — though the underlying routing, hours and fallbacks still have to be designed.

Sources

  1. Combating Spoofed Robocalls with Caller ID Authentication — Federal Communications CommissionThe STIR/SHAKEN framework, the attestation levels carriers sign calls with, and the mandate requiring providers to authenticate caller ID.
  2. 47 U.S.C. § 227 — Restrictions on the use of telephone equipment — Cornell Legal Information InstituteThe Telephone Consumer Protection Act itself — the consent requirements, calling-hours limits, and private right of action.
  3. ITU-T Recommendation E.164 — The international public telecommunication numbering plan — International Telecommunication UnionThe international number format, the 15-digit maximum, and how country codes and national numbers compose.

See ivr (interactive voice response) in the product

An IVR (interactive voice response) system answers inbound calls and routes them using a menu, a spoken request, or data it already holds about the caller. Good IVR gets someone to the right person in one step. Bad IVR is the reason people press 0 repeatedly.

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