Slack integration

Missed calls & voicemails. Right in Slack.

Connect Slack and Numberline posts missed-call and voicemail notifications to the channels your team already watches. New text alerts arrive in the channels you choose, too.

Get early access See how it works →

Missed calls, voicemails, and new texts · Per-extension channels · Call or text back from Numberline

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Send each alert to the right channel.

Every extension has its own delivery settings: which events post, which channel they go to, and whether Slack is on for that extension at all.

Slack notificationsAlerts
Missed calls
#calls
New sales texts
#sales
Support voicemails
#support
Voicemail for Bob
#bob
Per-extension controlsSettings
Extension 1Sales#sales
Missed callsNew textsVoicemails
Extension 2Support#support
Missed callsNew textsVoicemails
Extension 3Bob#bob
Missed callsNew textsVoicemails
Extension 4BillingSlack off
Missed callsNew textsVoicemails

See it in Slack. Call or text back in Numberline.

N
NumberlineAPP10:42 AM

Missed call · Dana M. · Ext 1 Sales

Rang your mobile and Rosa’s mobile. No voicemail left.

Call back in Numberline

Missed call

Who called, which extension they chose, and when. The callback comes from the business number, never a personal cell.

N
NumberlineAPP11:07 AM

New text · (512) 555-0148 · Ext 1 Sales

“Hi, do you have availability Thursday for a quote on a new water heater?”

#salesReply in Numberline

New text

A preview of the message, posted to the channel that extension uses. The conversation itself lives in the shared inbox.

N
NumberlineAPP3:26 PM

New voicemail · Priya S. · Ext 2 Support

New voicemail, 0:24. Open Numberline to listen, read the transcript, and call back.

Voicemail notification

The team sees that a voicemail arrived, for which extension and from whom. Open Numberline to read the transcript, listen, and call back.

Slack sits on top of a complete phone system.

Calls reach people or connected AI agents by extension, texts and WhatsApp land in the shared inbox, and Slack tells the team what happened: missed calls, new texts, and voicemails. What an agent says on a call is not posted to Slack.

Slack questions

How does the Slack integration work?
Connect your Slack workspace and choose which events post where. Numberline posts missed-call, voicemail, and new-text notifications into the channels you pick. Open Numberline to read the message and call back. Slack notifications are included on Grow and Max.
Can different extensions post to different channels?
Yes. Sales voicemails can go to #sales while Support goes to #support. Each extension has its own delivery settings: which events post, which channel, and whether Slack is on for that extension at all.
Can I reply from Slack?
Slack is where you see the activity. To act on it, open the Numberline app: call back or text from the business number, so customers never see a personal cell.
Is Slack required?
No. Slack is optional. Every call, text, and voicemail also lands in the Numberline app and email, and greetings, extensions, and forwarding work the same with or without it. Slack notifications are included on the Grow plan and up; see pricing. Messaging lives in the shared texts & WhatsApp inbox.
Do you charge per user?
No. Users are unlimited. Add teammates, assistants, and contractors without another seat fee.
Do I need new phones or equipment?
No. Numberline forwards calls to the mobile you already have. There is nothing to buy or install.

Get your business calls, texts & voicemails posted to Slack.

A business number with greetings, extensions, and forwarding, and every event posted to the channels your team already watches.

Get early access
No per-user pricing No long-term contracts Works on the phone you have