Start with a business number that rings the founder’s mobile. When an assistant or account lead joins, add their phone, share the inbox, and give each person an extension on the same number clients already call.
A number for the agency · Rings the phones you already have · No per-user fees
In a new agency the founder is the phone system. Every client call, every text about a deliverable, and every new inquiry lands on one personal mobile, usually in the middle of client work. When the first assistant or account lead joins, there is no clean way to hand calls over: the number on the proposals is still the founder’s cell, and the text threads live on one phone.
Numberline gives the agency its own number from the start. Calls ring the founder’s mobile with the business number as caller ID, and unanswered calls go to your business voicemail with the transcript emailed so you can read it between sessions. When a teammate joins, add their mobile to the ring list, give them the shared inbox where texts are assigned and noted, and add an extension for new inquiries and one for current clients, all without changing the number. See how call forwarding and extensions work and how the shared inbox works.
Local or toll-free. Outside hours, callers hear a closed-hours greeting and reach business voicemail.
Ring the founder first, then add a teammate’s mobile or give each person an extension. No desk phones and no per-user fees.
Every message recorded, transcribed, and emailed on every plan. Voicemail notifications in Slack on Grow and Max.
Once the number is registered for texting, the team replies as the business, assigns conversations, and adds internal notes.
The same number handles each one. Only the rules change.
You are in a client session and cannot pick up. The prospect hears your business greeting and leaves a message on your business voicemail. At the break, you read the transcript in your email and start the callback in Numberline so the prospect sees the business number. See how voicemail transcription works.
Once texting is registered, a client’s change request lands in the shared inbox instead of the founder’s phone. Your assistant replies from the business number, assigns the conversation to the account lead, and adds an internal note about scope, so the thread stays with the agency. Add their mobile to the ring list too, after the founder’s or at the same time on Grow and Max. See how business texting works.
Northwind, a fictional agency, adds a short menu. Extension 1 for new inquiries rings the founder’s mobile. Extension 2 for current clients rings the account lead’s mobile, then the founder’s. Optional: point Extension 1 at a connected AI agent that collects project scope, budget, and timing from new inquiries while existing clients still reach the account team. Callers dial the business number and press one option during the greeting. Lite includes 2 extensions (the operator plus one more), so a menu with two extensions like this one needs Grow (5) or Max (unlimited). See how extensions work.
Northwind, a fictional agency: one business number, two extensions, the phones each one rings, and voicemail after hours.
Every plan includes forwarding, greetings, business voicemail with transcripts, and the shared inbox, with 2 extensions on Lite (the operator plus one more), 5 on Grow, and unlimited on Max, so this two-extension menu needs Grow or Max. Ringing phones at the same time, voicemail notifications in Slack, and WhatsApp are included on Grow and Max. Compare plans →
Ring the founder’s mobile today, hand calls and texts to an assistant when they join, and add an extension for each person as the agency grows.
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