Integration · lemlist
Your lemlist sequence,
with a voice and a phone.
A webhook is all it takes. lemlist keeps sending the emails; when a lead opens, clicks or stalls, Sono picks it up and adds the two channels an email tool can't reach — an AI phone call and a WhatsApp message. Every outcome is written back through the lemlist API, so the sequence reacts.
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Day 1 · lemlist
Opening email sent
Day 3 · lemlist
Follow-up sent — opened 3×, no reply
Day 4 · webhook → Sono
AI call placed
"You had a look at my note on Tuesday — is cutting your no-shows something you're actively working on?"
Day 4 · Sono
WhatsApp: calendar link sent
Day 5 · back in lemlist
Marked interested · sequence paused
The problem
Your best leads are the ones
who never reply
A well-run lemlist campaign already tells you who is paying attention. What no sales engagement platform can do on its own is act on that signal in a channel the prospect will actually respond in — which is where outbound sales calls still win.
01
Interest without an answer
Four opens and two link clicks is a buying signal. Sending a fifth email is not a response to it — it is the same channel, competing with everything else in that inbox.
02
Calling doesn't scale by hand
Everyone agrees the warm leads should be called. In practice a rep works the top of the list, the rest ages out, and the campaign's signal is wasted.
03
Channels that don't talk
A call made outside the tool doesn't stop the sequence. The prospect who booked a meeting on Tuesday still gets the breakup email on Thursday.
How it works
A webhook out,
an outcome back
Nothing moves out of lemlist. Sono attaches to the campaign you are already running, turning a cold email tool into genuine multichannel outreach.
Step 01
Point a webhook at Sono
In lemlist, add a webhook for the events you want to act on. No code, no middleware — though Zapier, Make or n8n work if you already run them.
Step 02
The event fires
A lead opens three times, clicks the deck, or lands on step four without replying. Sono receives the lead, the campaign and the full email history.
Step 03
Sono calls or messages
An AI call that references the email the lead already read, a WhatsApp message, or both in sequence — on the timing and cadence you set.
Step 04
lemlist finds out
Sono writes the outcome back: pause the sequence, mark interested, set a custom variable the next email can use, and push the transcript to your CRM.
Triggers
What happens in lemlist,
what Sono does next
A starting set. Every rule is yours to change — the thresholds, the delays, the channel, and whether a human approves first.
| lemlist event | Sono action | Written back |
|---|---|---|
| Opened 3× · no reply | AI call referencing the email they read | Disposition, transcript, next step |
| Clicked a link | AI call within the hour, while the tab is still open | Interest level and objection captured |
| Replied — positive | WhatsApp with a calendar link, call if unanswered | Sequence paused, marked interested |
| Reached final step | One last AI call before the lead goes cold | Closed-lost reason, or re-queued |
| Call went to voicemail | WhatsApp follow-up the next morning | Attempt count, retry scheduled |
| Meeting booked on the call | Confirmation over WhatsApp and email | Sequence stopped, CRM updated |
| Not interested — any channel | All Sono outreach stops immediately | Suppressed across email, call and WhatsApp |
The channels
Three channels,
one conversation
Each does something the other two can't. The integration is what keeps them from behaving like three separate campaigns.
lemlist
Reach and personalisation at volume, plus the intent data that makes the other two channels worth using at all.
Best at: starting the conversation and telling you who is interested.
Sono
AI calls
A real conversation that qualifies, handles the first objection, and books the meeting — at whatever volume the campaign produces.
Best at: turning an open into a yes, a no, or a date.
Sono
From your own business number, for the moments a call is too much and an email is too little — links, confirmations, missed-call follow-ups.
Best at: keeping a warm thread alive without pressure.
On the call
Not a cold call —
a follow-up
Sono opens by referring to the email the lead has already read, which changes the conversation entirely. It identifies itself as an AI assistant, works from your qualification criteria, and hands anything off-script to a person with the context attached.
More on outbound callsBudget, timing, team size, current tooling — whichever criteria you define, asked conversationally rather than as a form.
A meeting written straight into the right rep's calendar, confirmed by WhatsApp and email before the call ends.
A live transfer when a rep is available, or a briefed callback when they aren't. The prospect never repeats themselves.
A clear no stops everything — the sequence, the calls and the messages — across all three channels at once.
FAQ
Frequently asked
questions
It turns a lemlist email sequence into a multi-channel campaign. lemlist keeps doing what it is good at — sending and personalising email at volume — and fires a webhook when something happens: a lead opens, clicks, replies, or reaches a given step. Sono picks that webhook up and adds the channels lemlist doesn't cover: an AI phone call and a WhatsApp message. Outcomes are written back so the sequence reacts.
Through webhooks in both directions, with no code to maintain. You point a lemlist webhook at Sono for the events you care about, and Sono calls back into lemlist to update the lead — pausing the sequence, marking interested, or writing a custom variable your next email can use. If you would rather route through Zapier, Make or n8n, that works the same way.
The usual campaign events: email sent, opened, clicked, replied, bounced, unsubscribed, marked interested or not interested, and reaching a specific step in the sequence. You choose which ones matter. A common setup is an AI call after three opens with no reply, and a WhatsApp message the day after a call that went to voicemail.
It opens by referring to the email the lead already received, so the call is a follow-up rather than a cold interruption. From there it qualifies against the criteria you define, answers the questions your buyers ask, and books a meeting straight into your calendar. Anything outside the script is handed to a person, and the transcript is on the lead record either way.
Because the leads worth calling are the ones the sequence has already warmed up, and email alone can't tell you why a lead who opened four times never replied. A call reaches that person in a channel with far less competition, and it produces an answer — yes, no, or not now — rather than another silent open.
As the channel between an email and a call. Sono sends WhatsApp messages from your number for the moments where a call is too much and another email is too little: confirming a meeting, following up on a missed call, resending a link. Replies come back into the same thread and Sono can carry the conversation or hand it over.
No. Sono writes back to lemlist and reads lead state before acting, so a lead who replies to an email is taken out of the calling queue, and a lead who books on a call is stopped in the sequence. Suppression lists, do-not-call flags and unsubscribes are honoured across all three channels rather than per channel.
Sono identifies itself as an AI assistant at the start of every call, observes calling-time restrictions and do-not-call registers, and records and transcribes every conversation for audit. WhatsApp messages go out from your own business number under your own templates and opt-out handling. Which rules apply depends on your market and your list, so the campaign is configured around them rather than the other way round.
Connecting the webhooks and mapping the events is usually under a day. Writing and reviewing the call script, the qualification criteria and the WhatsApp templates is what takes real time — most teams run a first campaign within one to two weeks and tune from the recordings.
Both directions. Outbound, lemlist webhooks push campaign events to Sono as they happen, so there is no polling and no delay. Inbound, Sono writes back through the lemlist API — pausing a sequence, marking a lead interested, setting a custom variable your next email can personalise against. Everything the integration does is available to you through the same API if you want to build on top of it.
Not quite, and the distinction matters for how the calls land. Cold calling means dialling a list that has never heard from you. Here, every lead Sono calls has already received one or more emails from your lemlist campaign and has usually opened or clicked them, so the agent opens by referring to that email. It is closer to an AI-driven follow-up call than a cold call — which is why connect and conversation rates behave differently from a cold list.
No, and the integration would not make sense if you did. lemlist stays the system of record for the email sequence and the campaign; Sono is an additional channel attached to it. lemlist is a trademark of its respective owner and Sono is an independent product.
Get started
Put a call behind your best campaign
In a 30-minute demo we wire a webhook to a live lemlist campaign of yours, trigger it, and you listen to Sono call the lead and write the outcome back.
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