IVR (Interactive Voice Response)
Short answer: IVR (interactive voice response) is an automated phone system that plays recorded prompts and routes callers based on keypad presses or spoken answers, such as "press 1 for sales". Businesses use it to direct calls, authenticate callers and handle simple requests without an agent.
IVR menus usually run on a PBX or contact-center platform that sits behind the phone number callers dial.
How it works
When a call arrives, the IVR plays a prompt, collects DTMF digits or speech, and follows a call flow to an extension, queue or message. Voice applications can be scripted in standards such as W3C VoiceXML or configured in PBX software.
Common parts of an IVR call flow
- Greeting: a recorded or text-to-speech welcome message played when the call is answered.
- Menu prompts: options such as "press 1 for sales, press 2 for support", collected as DTMF digits or speech.
- Routing rules: each choice sends the caller to an extension, a ring group, a queue or another menu.
- Time conditions: different flows for business hours, evenings and holidays.
- Fallbacks: what happens on no input or an invalid key, such as repeating the menu or sending the call to an operator.
IVR vs voicemail vs call forwarding
These three features are often confused because each decides what happens to an incoming call, but they solve different problems.
| Feature | What the caller experiences | Typical use |
|---|---|---|
| IVR | A menu of recorded options answered by keypad or voice | Routing callers to the right team or self-service answer |
| Voicemail | A greeting followed by a recording of their message | Capturing messages when nobody can answer |
| Call forwarding | The call simply rings at another phone number | Reaching a person on a different device or line |
Does Smart Messaging offer it?
As stated above, IVR is not listed as part of the Smart Messaging service. What every Smart Messaging number does include is SIP credentials, so a SIP-compliant PBX you operate can register the number and handle menus there, plus call forwarding to any phone if you only need calls to reach you elsewhere.
How it applies to Smart Messaging
IVR is not listed as part of the Smart Messaging service. Smart Messaging supplies the phone numbers and SIP credentials; a PBX you run, such as Asterisk, FreePBX or 3CX, is where call menus would be configured.
Related terms
- DTMF
- PBX
- SIP trunk
- Toll-free number
Frequently asked questions
Does IVR need DTMF?
Keypad menus rely on DTMF; speech-based IVR uses voice recognition instead.
Does Smart Messaging provide IVR menus?
No, IVR is not a listed Smart Messaging feature; it would be configured in your own PBX.
Can a PBX with IVR register a Smart Messaging number?
Smart Messaging works with any SIP-compliant software, including Asterisk, FreePBX and 3CX.
What is the difference between IVR and an auto attendant?
An auto attendant is a simple form of IVR that answers calls and transfers them by extension or department; fuller IVR systems can also look up data and complete tasks.
Can IVR understand spoken answers?
Yes, many IVR systems use speech recognition so callers can say an option instead of pressing a key.
Why do IVR menus sometimes ignore keypad presses?
Keypad input depends on DTMF being carried correctly, for example as RFC 2833 events or SIP INFO; a mismatch between devices can drop the digits.
Related pages
- DTMF
- PBX
- SIP trunk
- 3CX integration
- FreePBX integration
- call centers use case
- E.164 International Phone Number Format
- Local (Geographic) Phone Number
Sources
- W3C: Voice Extensible Markup Language (VoiceXML) 2.0 (as of September 2026)
- Wikipedia: Interactive voice response (as of September 2026)