Leave a voicemail on the first attempt and on the last one, and skip it in between. Callbacks from cold voicemails are rare, in our experience a low single-digit percentage, but the missed call and the "1 new message" notification make your number familiar, and familiarity is what lifts the pickup on the second call. With a parallel dialer, dropping a pre-recorded message costs the rep nothing, so the only question left is whether the message is worth 20 seconds of the prospect's attention.

What a voicemail actually does

Most reps judge voicemails on callbacks, and by that measure they fail. Few prospects call a stranger back. An eVoice study from 2013 found that only around 18% of people listen to voicemails from unknown numbers at all, and nothing suggests that number has gone up since.

The value is elsewhere. A prospect who sees a missed call from an unknown mobile, then a voicemail notification, then the same number again two days later, has a story: someone is trying to reach me, and they left their name. The second call is no longer cold. It is a known number with a known reason.

That is the metric to track: connect rate on the second attempt, with and without a voicemail on the first. Not callbacks.

The French particularity: screening and transcripts

In France, unknown mobile numbers are screened heavily, partly because of years of consumer telemarketing. Our 1,000,000-call benchmark with Quentin Despas (Katana) shows an 11.3% average connect rate, with 4pm at 15.8% and 8am at 9.8%, so most attempts end on the "messagerie".

Two things change the game. Visual voicemail and transcription on iPhone and Android mean many prospects read your message rather than listen to it. And a prospect who screens calls still reads the notification. In our experience a message that reads well as two lines of text outperforms one that only sounds good.

Write the message to be read: name, company, one concrete reason, one next step. No jokes that need a tone of voice.

When to leave a voicemail, and when not to

A simple rule set.

• First attempt: yes. It introduces the number and the name.
• Attempts two to four: no. Repeated messages from the same number read as pressure, and they fill the mailbox with nothing new.
• Last attempt: yes, a short break-up message that closes the loop and leaves the door open.
• Always when the prospect expects a call: inbound leads, referrals, a deferred conversation ("call me Thursday"), and in sectors where the phone is the normal channel, such as recruiting and real estate.
• Never when you have no specific reason to call this person. A generic message confirms that you are one of many.

In our experience, most connects happen within the first three attempts. Your voicemail's job is to make attempts two and three count.

What to say in 20 seconds

The structure we use, in English and in French.

English: "Hi Thomas, this is Léa from Sonik. I saw you opened three sales roles in Lyon last week and wanted to ask how you plan to ramp them on the phone. I will try you again Thursday around 4. My number is 06 12 34 56 78, again 06 12 34 56 78."

French: "Bonjour Thomas, Léa de Sonik. J'ai vu que vous recrutiez trois commerciaux à Lyon et je voulais savoir comment vous comptez les faire monter en puissance au téléphone. Je vous rappelle jeudi vers 16h. Mon numéro, le 06 12 34 56 78, je répète, 06 12 34 56 78."

Four elements, no more: who, the trigger, the next step, the number twice. No pitch, no "leader in", no "I would love to". The trigger is the part that makes it personal, and it is the part most reps skip. In our benchmark, 65% of reps open live calls by explaining what they sell. Do not do it on voicemail either.

Voicemail drop and parallel dialing

Recording a message by hand takes 30 to 45 seconds, and at the volumes a parallel dialer produces, most attempts end on voicemail. Manual voicemails would eat the whole session. A voicemail drop plays a pre-recorded message when the machine answers and moves the rep to the next live conversation.

Three rules to keep drops from sounding like drops.

1. Record three versions per persona, with a real trigger in each ("the roles you opened", "your expansion to Spain"). Rotate them.
2. Record at your desk, standing, in one take. Warm and slightly imperfect beats polished and flat.
3. Never drop on the same contact twice in a week. The drop follows the same first-and-last rule as a manual message.

Measure it in two weeks

Split your next list in two. Half gets a voicemail on the first attempt, half gets none. Call both halves back on the same schedule and compare the connect rate on attempt two. If the voicemail half does not win, rewrite the message before concluding that voicemails do not work. In our experience the message is the variable, not the channel.

How Sonik approaches voicemails

Sonik's parallel dialer detects voicemail and drops a pre-recorded message chosen for the session, so the rep only hears live humans. Reps record their own messages, and we push them to record several per persona with a trigger in each, because a drop with no reason to call is a wasted 20 seconds.

Outcomes are logged per attempt, so a team can see its second-attempt connect rate with and without a message and decide from its own data. More on the Sonik dialer.

Conclusion

Yes, leave a voicemail, on the first attempt and the last, written to be read, with one trigger and one next step. Judge it on second-call pickup, not on callbacks. This week, record one 20-second message per persona and run the split test on your next list. You will know in ten working days whether your message earns its place.