Get a local or toll-free number, forward calls to your mobile or team, and manage texts and voicemails in one inbox. Add extensions, teammates, Slack, WhatsApp, and connected AI agents when you need them.
Every account starts with one business number. Pick a fresh one or bring the number your customers already know.
Which business number should you choose?→A number in the area code your customers know. Search by city or area code.
An 800-series number that reads national, for customers anywhere.
Move the number your customers already have saved. It keeps working the whole time the transfer completes, and nothing changes for callers.
Add numbers for a second location or a campaign. They share the same extensions, inbox, and settings.
A number that spells a word, toll-free or local, that customers remember from one hearing.
Follow your number’s carrier text-messaging registration, so you know exactly when business texting is live.
Record what callers hear first, then give them somewhere to go - “press 1 for Sales, 2 for Support” - or dial a person directly. Each extension rings wherever you point it.
What callers hear first during business hours: your welcome and menu options.
A different message for evenings, weekends, and closed days.
Sales, Support, Billing - each one rings the right mobiles.
Set dates ahead of time; the right greeting plays automatically.
Type the words; the audio is generated in your chosen AI voice and saved as a recording. Nothing is synthesized live on calls.
Play the greeting before callers hear it; regenerate until it sounds right.
Prefer the personal touch? Record a greeting yourself, or upload audio you already have.
Change the words anytime; saving renders a fresh recording.
Direct lines for people: Bob is 101, dialable from the menu anytime.
Each extension forwards to a person or a connected AI agent. Ring one phone, several people, or a mix - in order, all at once, or on a schedule - or let an agent from your AI provider answer that extension. Your personal number always stays private.
Destinations are ordinary phones: mobiles, an existing business phone, a landline.
With call announce enabled, the first person to press 1 takes the call, and the other phones stop ringing. Ring all at once is included on Grow and Max. See a complete call routing example ›
During business hours calls ring the team. After hours the number follows its own after-hours rules.
Ring teammates in the mobile app, with business caller ID.
Register a desk phone to an extension: plug into ethernet and it rings.
Choose a connected agent to answer Sales, to pick up when your team cannot answer, or to cover after hours. How connected AI agents work ›
Hear which extension the call is for before you accept, so you always answer as the business.
Every voicemail a caller leaves is recorded and transcribed, then emailed where you'll actually see it. Grow and Max add an AI summary and Slack notifications.
Summary: Water heater is leaking - wants a callback this afternoon for an emergency visit.
“Hi, this is Priya. Our water heater is leaking pretty badly - can someone call me back this afternoon? I think it's an emergency.”
New voicemail on Sales from (415) 555-0182 · 0:24
Read voicemail transcripts in Numberline or email. Get voicemail notifications in Slack on Grow and Max.
Every voicemail is transcribed and emailed to the addresses you choose. The transcript is in the body, so you read it before you call back. How voicemail transcription works ›
Get voicemail notifications in the channel you choose. Open Numberline to read the message and call back. Grow and Max. Learn more ›
Every answered, outgoing, and missed call on the business number, in one list.
See who you missed, with the voicemail and transcript attached to the same entry.
A two-line summary of what the caller wants and when they need a callback.
Find any call or voicemail by name, number, or what was said.
The recording arrives as an MP3 attachment you can play, forward, or file anywhere.
Sales voicemails go to different people than Support. Each extension has its own recipients.
Outbound calling, shared messaging, and integrations are there when you want them. None of it is required to start.
The Numberline app puts your business line on the phone you already carry, iPhone or Android. Dial out and customers see your business caller ID - your personal number stays private.
Call from your iPhone using your business number→Calls, texts, voicemails, and settings on the phone already in your pocket. No new hardware.
Dial out or return a call and customers see your business number, never your cell.
Return a voicemail or text from its transcript, straight from the business number.
Business calls ring the app; your personal line and number stay untouched.
Customers message your business number and every conversation lands in one shared inbox - the history stays with the company, not one person's phone.
Texts and WhatsApp messages land in one inbox the whole team can see, not on one person's phone.
Give a conversation an owner so nothing falls through; everyone sees who has it.
Answers go back over the same channel the customer wrote, always from the business.
Connect your AI provider, choose an agent, and decide which calls it answers. Get missed-call, voicemail, and new-text notifications in Slack, add WhatsApp to the shared inbox, and send events to your own software with webhooks.
Post new texts, missed calls, and voicemails into the channels your team already watches. More →
Let customers message your business number on WhatsApp. Conversations appear alongside SMS in the shared Numberline inbox. More →
Connect Vapi, Retell, or ElevenLabs, choose an agent, and assign it to an extension, to calls your team cannot answer, or to after hours. 1 agent on Lite, 3 on Grow, unlimited on Max. More →
An agent you host on another platform, added as a custom destination with its SIP address. Counts toward the connected-agent allowance.
Send call and message events to your own software in real time.
Connect Numberline to other apps with no-code automations.
Numberline manages the business number, extensions, and routing, and adds AI-voiced greetings, voicemail transcripts, and, on Grow and Max, AI voicemail summaries. Agents that answer calls come from your AI provider; you choose which calls each one takes. How connected AI agents work →
Connect a compatible SIP desk phone: plug it into ethernet and it registers to your business number and extensions, no server needed. Optional, the mobile app does everything.
Unlimited users on every plan. Plans vary by numbers, extensions, outbound minutes, connected AI agents, and advanced features.
Start by ringing your mobile. Add extensions, teammates, Slack, WhatsApp, and connected AI agents when you need them.
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