Voicemail Makes Your Next Cold Call Worse. Leave One Anyway.
Gong's data says leaving a voicemail cuts your future connect rate by roughly 28%, and more than doubles your email reply rate at the same time. Both are true. Here's how to write a voicemail that earns the trade.
Most reps leave a voicemail that guarantees no callback. They ramble for 45 seconds, pitch the product, spell out their number twice, and hang up sure they sounded professional. Nobody calls back.
There's a harder problem underneath that, one no amount of scripting fixes on its own. Gong's data shows leaving a voicemail actually lowers your connect rate on every future dial to that number by roughly 28%, because the prospect now knows a salesperson is calling and screens accordingly. That's the strongest argument for never leaving one that exists, and it's real. But the same dataset found the opposite effect on email: a voicemail paired with a follow-up email more than doubles the email's reply rate, from 2.73% up to 5.87%. You're not choosing between a good outcome and a bad one. You're trading a worse phone number against a much better email, and which one you should want depends on which channel is actually going to close this specific prospect.
If your plan is to keep dialing this number cold, skip the voicemail: you're paying a real cost for a message most people delete anyway. If email is going to do real work in this sequence, the voicemail is what makes it land, because it's the reason the prospect opens an email from a stranger's name in their inbox instead of archiving it unread. Once you know which trade you're making, the script matters. Here's the one I leave.
Keep it inside 20-25 seconds
The clearest research on voicemail length comes from InsideSales/XANT, whose data on inside-sales calls found the strongest response window sits between 18 and 30 seconds, with results dropping roughly 2% for every additional second past that. I time mine to land under 25. The point of the message was never to explain anything: it's to be short enough to survive to the end.
The script, word for word
"Hey Mark, it's Sarah with DialDynamics. I'll keep this to ten seconds. I work with outbound teams in Calgary whose dials started landing as 'Spam Likely,' and I found two fixes that move the needle fast. I'll try you Thursday at 10, or you can reach me at 403-555-0142. Either way, talk soon."
That runs 18 seconds at a normal pace. Every line earns its spot:
- Name and company up front, then a promise of brevity so they keep listening.
- A reference point pulled from their world (Calgary outbound teams, "Spam Likely" labels), so it sounds like a peer calling, not a vendor.
- A reason to call back without the pitch. Two fixes, not the whole product.
- A specific callback time plus your number, said once and slow.
- A close that assumes you will speak again.
Say your number once, and slow
Reps say the number twice, fast, at the very end, then wonder why nobody wrote it down. Say it once. Say it slow enough to write. Put it before your sign-off, not after, because the last thing you say is the thing they remember, and you want that to be "talk soon," not a string of digits.
Pair the voicemail with the follow-up email, not just a callback
Given that Gong's data puts the reply-rate lift on the email, not the phone, the voicemail's real job is setting up that email, not fishing for a callback on its own. Send the email within the hour, referencing the exact thing you said in the voicemail. A prospect who hears a specific, relevant voicemail and then sees an email that clearly follows from it is far more likely to open it than one that arrives cold. That's the sequence the numbers actually support: voicemail as the setup, email as the payoff.
What not to do
Do not pitch the product on voicemail. Do not say "just following up." Do not leave your number twice. Do not end on your phone number. Do not record yourself sounding nervous. Re-record until you sound like someone who already knows them.
Your next step
Write your own version of the script tonight. Fill in a real reference point from your market, a real reason to call, and one specific callback time. Read it out loud with a timer running. If it passes 20 seconds, cut a line. Leave it on your next three no-answers and see which ones call back.