How to Add a New User or Extension to Your VoIP System

Adding Users and Extensions — A Core Admin Task

Every time your business hires someone, moves a team member to a new role, or opens a satellite office, you need to create a new user account and extension on your phone system. On a traditional PBX, that meant raising a ticket with the telecoms provider and waiting days for an engineer. On a modern cloud VoIP platform, it takes minutes — and you can do it yourself from any web browser.

This guide walks through the full process: planning the extension scheme, creating the user, assigning permissions, provisioning a handset or softphone, and testing the setup before the new starter's first day.

Before You Start — Planning Your Extension Scheme

If your business already has an extension numbering plan, follow it. If not, now is a good time to create one. A consistent scheme makes the directory easier to navigate and avoids clashes as the company grows.

Common approaches include:

• Department-based ranges. Sales gets 200–299, support gets 300–399, finance gets 400–499. This makes it easy to identify which team an extension belongs to.
• Site-based ranges. London office uses 1xxx, Manchester uses 2xxx. Useful for multi-site businesses.
• Sequential allocation. Simply assign the next available number. Simpler to manage but offers no organisational context.

Whichever model you choose, document it. A shared spreadsheet or wiki page that maps extensions to users and departments prevents duplication and confusion down the line.

Step-by-Step: Creating a New User

The exact screens vary by platform, but the workflow is consistent across most hosted VoIP systems:

Step 1 — Log Into the Admin Portal

Open your VoIP provider's management console. You will need an account with administrator or user-management permissions.

Step 2 — Navigate to Users or Extensions

Look for a section labelled "Users," "Extensions," or "People." This is where all user accounts are listed and managed.

Step 3 — Click "Add User" or "Create Extension"

Fill in the required fields:

• First name and last name. Used in the company directory and caller-ID display.
• Email address. Most platforms use this as the login credential and send the welcome email here.
• Extension number. Enter the next available number according to your scheme, or let the system auto-assign one.
• Direct dial number (DDI/DID). If the user needs their own external phone number, assign one from your available number pool.

Step 4 — Set a Voicemail PIN and Greeting

Enable voicemail for the new extension and set a temporary PIN. The user can change it on first login. Most platforms also let you upload or record a personalised voicemail greeting.

Step 5 — Assign to Groups and Queues

If the new user should receive calls for a shared number — for example, the main sales line — add their extension to the relevant ring group or call queue. This step is easy to overlook and results in the new starter wondering why they never receive calls.

Step 6 — Set Permissions and Calling Rights

Decide what the user is allowed to do:

• Can they make international calls?
• Can they access call recordings?
• Should they have admin-level access to the portal, or user-level only?

Applying the principle of least privilege keeps your system secure and prevents accidental changes.

Step 7 — Provision a Device

The user needs something to make and receive calls on. Options include:

• Desk phone (IP handset). Enter the handset's MAC address in the portal, or use auto-provisioning — plug the phone into the network and it downloads its configuration automatically.
• Softphone app. Install the provider's desktop or mobile app and log in with the new credentials. No hardware required.
• Microsoft Teams or web client. If your platform integrates with Teams or offers a browser-based phone, the user can start making calls immediately with no installation.

Step 8 — Send the Welcome Email

Most platforms send an automated email containing the user's login URL, extension number, voicemail PIN, and a link to download the softphone app. Verify that the email arrives and the credentials work.

Onboarding Checklist for New VoIP Users

Creating the account is only half the job. Use this checklist to make sure the new starter is fully set up:

1. Extension created and tested (internal call rings correctly).
2. DDI assigned and tested (external call reaches the user).
3. Voicemail configured with a personal greeting.
4. User added to the correct ring groups and queues.
5. Calling permissions set (international, premium-rate restrictions).
6. Device provisioned — desk phone registered or softphone installed.
7. Company directory updated with the new extension.
8. CRM integration verified — screen pop works for the new user.
9. User trained on basic features — transfer, hold, conference, voicemail retrieval.

For a broader onboarding framework that covers IT setup beyond the phone system, see our IT onboarding checklist for new employees.

Managing Extensions at Scale

Adding one user is simple. Adding fifty — during a recruitment drive or an office move — requires a more efficient approach:

• CSV bulk import. Most VoIP platforms let you upload a spreadsheet of user details and create all accounts in one operation. Prepare the file with names, emails, extension numbers, and group memberships before you start.
• Templates. Create user templates for common roles — "sales agent," "support engineer," "receptionist" — with pre-configured permissions, group memberships, and calling rights. Apply the template when creating each account.
• API automation. If your business uses an HR system or identity provider, the VoIP platform's API can create and deactivate accounts automatically when employees join or leave, keeping the phone system in sync with the HR database.

Deactivating and Removing Users

When someone leaves the company, clean up their VoIP account promptly:

1. Remove the user from all ring groups and queues so calls are no longer routed to an unattended extension.
2. Redirect or reassign their DDI number to a colleague or a voicemail box.
3. Disable the account login to prevent unauthorised access.
4. Archive or export voicemails and call recordings if required for compliance.
5. Return and factory-reset any assigned hardware.

Failing to deactivate accounts is a common oversight that can lead to unanswered calls reaching departed employees' voicemail indefinitely — a poor experience for any customer who dials that number.

Tips for a Smooth Process

• Keep your number pool topped up. If you frequently assign DDI numbers to new starters, make sure you have spare numbers available. Ordering new numbers from your provider can take a day or two.
• Standardise voicemail greetings. Provide a script so every greeting follows the same format: name, department, promise to return the call, and an alternative contact.
• Document everything. Maintain a living register of extensions, DDIs, group memberships, and device assignments. It saves time when troubleshooting and during audits.

For a full overview of hosted platforms that make user management straightforward, see our guide to hosted VoIP solutions in the UK for 2026.