Voicemail, IVR menus and no-answers: what an AI agent should do when nobody picks up
In cold calling, 42–50% of dials connect, and roughly every second company ends up in a 20-second-plus conversation with the agent. The rest is silence, ringing, voicemail and “press 1.” Here's how we taught the system to tell these apart, and what happens next so a company doesn't fall through the cracks.
Contents
What “didn't get through” actually means
Outcomes of 2,758 dials in the UAE and Venezuela (September–October 2026):
| Outcome | UAE | Venezuela |
|---|---|---|
| No answer | 503 | 457 |
| Number unreachable or busy | 241 | 155 |
| Hung up in the first seconds | 222 | 116 |
| Voicemail | 77 | 43 |
| IVR menu | 36 | 16 |
| Silence on the line | 19 | 20 |
| Call failed to place | 121 | 42 |
Every outcome has its own next step. So the first job of the system is to know exactly what happened.
Voicemail: stay quiet and hang up
The rookie mistake: the agent greets the voicemail and pitches it. That burns minutes and sounds odd if anyone plays the recording later. Our rule is simple. On a recording, say nothing, end the call, log it as “voicemail.”
The look-alikes are trickier. In Latin America, phones often have call screening on: a robot asks for your name and the reason for the call (“Graba tu nombre y el motivo de la llamada”). That's not voicemail. There's a live person on the other end waiting to see who's calling. Here the agent briefly says who it is and why it's calling.
IVR menus: get through or back off
“For sales, press 1” is standard at large dealerships. The agent can press menu keys, but there are plenty of pitfalls:
- Not every tone gets heard. Some office phone systems don't pick up in-band key presses. The agent presses, and the menu just repeats.
- Don't narrate. The agent shouldn't say “okay, pressing one.” It doesn't help the menu, and the recording sounds ridiculous.
- Know when to stop. If the menu hasn't let it through to a person after two tries, the number is flagged as a “dead-end menu” and isn't dialed again. We look for another contact instead—a direct line or WhatsApp.
No answer: don't call a third time
Our most expensive mistake in the campaign was right here. Because of a labeling bug, a no-answer was logged as “call didn't happen,” so the system thought there had been no attempts. Some companies got called up to eight times in a day.
Then a warning came from our telephony provider: over two weeks, half of our calls ended in a timeout with no answer. That's a typical picture for cold calling, but carriers have thresholds for it. Above them come surcharges and traffic restrictions.
What we did:
- Fixed the labeling and restored the correct outcome for 95 calls.
- Set a cap: one dial per day to a cold number.
- Built a follow-up sequence instead of more redials. It's configured per project: in some campaigns the client wants to message everyone, in others only people who replied on their own.
The sequence after a missed call
If a company hasn't picked up twice, the system doesn't dial a third time in a row. It switches channels:
- WhatsApp message—a template: who we are, what we offer, with “interested” and “not now” buttons.
- Email—if the number has no WhatsApp.
- A call at a different time of day—if the messages get no reply.
A dry run showed the scale: of 59 companies with missed calls, 42 were eligible for a send. For the rest it was too early—they'd already had a touch that day, had a sales rep's scheduled message queued, or had already replied to an offer.
The trap: WhatsApp auto-replies
Lots of companies turn on auto-reply in WhatsApp Business: “Thanks, we'll get back to you during business hours.” At first the system treated that as a client reply and waited for the conversation to continue. Now standard phrases and instant replies are flagged as auto-replies, and the sequence moves on.
After an offer—follow up every three days
One more rule born from missed calls. If a client got a quote and went quiet, the system doesn't wait for weeks. Three days later it calls to ask “how did the price look?” If nobody answers, it tries again three days later, up to five cycles. A missed call doesn't close the task.
FAQ
Why not just leave a voicemail?
In B2B, voicemails barely get listened to, and for an AI voice they're legally questionable in a number of countries. A WhatsApp message with buttons works better: people see it, and it's easy to reply to.
How many call attempts are optimal?
For us, two calls on different days, then messaging. More dials produce few new conversations and hurt the number's reputation with the carrier.
Can the agent press the right menu key?
Yes, if the menu hears those presses. If not, the agent backs off after two tries and the number gets flagged so we don't waste calls on it.
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