The Microsoft Teams Phone Setup: Is Your Business Ready?

A Microsoft Teams Phone setup can help your business bring calls, meetings and messaging into one platform. If your team already uses Microsoft Teams, it...

Emily

Published Date: 26/06/2026

A Microsoft Teams Phone setup can help your business bring calls, meetings and messaging into one platform. If your team already uses Microsoft Teams, it could be a practical way to replace your existing phone system and support hybrid working.

With Microsoft Teams Phone, users can make and receive external calls through Teams, helping businesses bring calling, meetings and internal communication into one platform. It can be a strong option for companies with hybrid teams, multiple offices, remote workers or staff who already use Microsoft 365 every day.

However, moving your phone system into Teams is not just a case of switching it on. Before making the move, it is worth checking whether your users, licences, phone numbers, internet connection and call flows are ready.

Before making the move, it is worth checking whether your business is actually ready. This guide will walk you through the main areas to review before setting up Microsoft Teams Phone.

What Is Microsoft Teams Phone?

Microsoft Teams Phone is a cloud-based phone system that allows businesses to use Microsoft Teams for external calling.

Instead of only using Teams for internal chats and meetings, Teams Phone allows users to call landlines and mobiles, receive calls on business numbers, transfer calls, use voicemail, manage call queues and route incoming calls to the right people.

For businesses already using Microsoft Teams, this can make communication simpler. Staff can handle calls from their laptop, desktop, mobile app or compatible desk phone, depending on how the system is configured.

It can be especially useful for businesses that want to:

Support hybrid or remote working
Reduce reliance on traditional phone lines
Simplify call handling across teams
Manage users through Microsoft 365
Bring meetings, chat and calling into one place
Improve flexibility across multiple locations

But before you move across, you need to check that the foundations are in place.

1. Check How Your Team Currently Uses Microsoft Teams

The first thing to review is whether your team already uses Microsoft Teams day to day.

If your staff are already comfortable using Teams for meetings, chat and collaboration, moving calls into Teams is usually much easier. If Teams is barely used in the business, you may need to focus on training and adoption before replacing your existing phone system.

Ask yourself:

Do staff use Microsoft Teams every day?
Are users comfortable with Teams meetings and chat?
Do remote or hybrid workers already rely on Teams?
Are staff using the Teams desktop and mobile apps?
Would users be comfortable answering business calls through Teams?
Are there any teams or departments that rarely use it?

A Microsoft Teams Phone setup works best when Teams is already part of the working day. If your staff are not confident using it, the phone system may feel like a bigger change than expected.

Quick check

If most of your team already uses Teams confidently, your business is in a good position from a user adoption point of view. If not, start with basic Teams training before making it your main phone system.

2. Check Your Microsoft 365 and Teams Phone Licences

To make and receive external calls through Teams, users need the correct Microsoft Teams Phone licensing.

Not every user in your business will necessarily need the same setup. Some staff may need a direct dial number. Others may only need to answer calls from a main business number or call queue. Some users may not need external calling at all.

Before setting up Microsoft Teams Phone, create a simple list of the people who need calling access.

Include:

Reception or front desk users
Sales teams
Customer service teams
Account managers
Engineers or field-based staff
Senior managers
Remote workers
Shared phones in meeting rooms, warehouses or communal areas

Then decide what each user needs.

For example, a receptionist may need to answer and transfer incoming calls from the main business number. A sales user may need their own direct number. A warehouse or reception area may need a shared device rather than a named user.

This step is important because it helps avoid paying for licences that are not needed, while making sure key users have the correct calling features.

Quick check

You are ready if you know:

Which users need external calling
Which users need direct dial numbers
Which teams need call queues
Which areas may need shared phones
Whether your existing Microsoft licences support the setup you want

If you are unsure, it is worth reviewing your Microsoft 365 licensing before making changes.

3. Check Your Current Phone Numbers

Your phone numbers are one of the most important parts of the move. Before switching to Microsoft Teams Phone, you need to know which numbers your business currently uses and what each number is for.

Make a list of:

Main business numbers
Department numbers
Direct dial numbers
Out-of-hours numbers
Support numbers
Sales numbers
Regional office numbers
Numbers used in marketing campaigns
Numbers listed on your website, Google profile, email signatures or printed materials

You should also check whether any old numbers are still active but no longer needed. Many businesses discover they are still paying for lines or numbers they no longer use.

Once you know which numbers matter, you can plan what needs to happen with them. Some numbers may need to be moved over. Others may need to be redirected, replaced or retired.

This is also a good time to check where your numbers appear online. If your phone number is listed across your website, Google Business Profile, email footers, social media pages or printed brochures, you need to make sure customers can still reach you during and after the migration.

Quick check

You are ready if you have a clear list of all active business numbers and know which ones need to be kept. If you are not sure how many numbers you have, check your telecoms bill or ask your current provider for a full number inventory.

4. Check Your Existing Telecoms Contract

Before making any changes, review your current telecoms contract. This is often overlooked, but it can have a big impact on timing and cost. Your business may still be tied into an agreement for phone lines, call packages, handsets or hosted phone services.

Check:

Who your current telecoms provider is
When your contract ends
Whether you are still in a minimum term
Whether there are early termination charges
What phone lines or numbers are included
Whether you are paying for unused services
Whether any equipment is leased or rented
Whether broadband and phones are bundled together

This does not mean you cannot move to Microsoft Teams Phone while under contract, but it does mean you need to plan properly. In some cases, businesses run systems side by side for a short period. In others, it makes sense to plan the migration closer to renewal.

5. Check Your Internet Connection

Microsoft Teams Phone relies on your internet connection. If your broadband is slow, unstable or unreliable, call quality may suffer.

Before moving your phone system into Teams, check whether your connection can handle voice traffic alongside your usual business activity.

Consider:

How many people will be using Teams Phone at the same time
Whether staff are also using Teams meetings, cloud apps and file sharing
Whether your connection drops regularly
Whether users complain about poor video call quality
Whether Wi-Fi coverage is strong across the building
Whether key users are connected by Wi-Fi or wired network
Whether you have a backup connection in place

A basic speed test can be useful, but speed is not the only factor. For voice calls, reliability, latency, jitter and packet loss also matter. A connection can look fast on paper but still perform poorly for real-time calls if it is unstable.

If your business has multiple sites, each location should be checked separately. One office may be ready for Teams Phone while another may need a better connection or improved network setup.

Quick check

You are ready if your internet connection is stable, your Teams meetings already perform well and your network can support multiple users making calls at the same time. If calls or meetings already struggle, fix the connection before moving your phone system.

6. Check Your Wi-Fi and Internal Network

Your broadband connection is only part of the picture. Your internal network also matters. Even with a strong internet connection, users may experience poor call quality if the office Wi-Fi is weak, overloaded or badly positioned.

Review:

Wi-Fi coverage across the office
Dead zones in meeting rooms or workspaces
Whether users rely on old access points
Whether desk phones will use wired connections
Whether network switches are suitable
Whether voice traffic can be prioritised
Whether remote workers have reliable home connections

For office-based users, wired connections are often more stable than Wi-Fi, especially for desk phones or high-call-volume teams. For laptop and mobile users, strong Wi-Fi coverage is essential.

If you have a busy office, shared workspace, warehouse, clinic, hotel or multi-floor premises, your Wi-Fi setup may need to be reviewed before Teams Phone is rolled out.

Quick check

You are ready if users can take Teams meetings from different areas of the building without dropouts, lag or audio issues. If call quality varies depending on where someone sits, your internal network may need attention first.

7. Map Out How Calls Should Flow Through the Business

One of the most useful things you can do before setting up Microsoft Teams Phone is map your call flow.

This means writing down what should happen when someone calls your business.

For example:

Who answers the main number?
What happens if reception is busy?
Should calls ring a group of people?
Should sales and support calls go to different teams?
What happens outside business hours?
Should calls go to voicemail?
Who receives missed call notifications?
Should calls be forwarded to mobiles?
Do different offices need different call routes?
Do you need recorded greetings or menu options?

This step helps you avoid simply copying an old phone setup that may no longer work well.

Many businesses move to a new phone system because the old one has become messy over time. There may be old extensions, unused departments, outdated voicemail messages or unclear routing rules.

A move to Microsoft Teams Phone is a good opportunity to simplify everything.

Example call flow

A simple setup might look like this:

Main business number rings reception first.

If reception does not answer, the call goes to a customer service call queue.
If no one answers after a set time, the caller hears a voicemail message.
Outside business hours, calls go straight to an out-of-hours message.
For larger businesses, call flows may include different departments, sites, opening hours, holiday routing and escalation paths.

Quick check

You are ready if you can clearly explain what should happen to every main business call. If your answer is “I’m not sure,” map the call journey before setting up Teams Phone.

8. Decide Whether You Need Auto Attendants or Call Queues

Microsoft Teams Phone can support features such as auto attendants and call queues.

An auto attendant is commonly used to greet callers and route them to the right department. For example, “Press 1 for sales, press 2 for support.”

A call queue allows multiple users to answer incoming calls. This is useful for teams where calls should go to the next available person rather than one individual.

You may need these features if:

You have a main business number
You have a reception team
You want calls routed by department
You have customer service or support teams
You want hold music or greeting messages
You need calls to ring multiple users
You want out-of-hours call handling
You have multiple locations

Not every business needs a complex setup. A small business may only need a simple main number and a few users. A larger business may need multiple queues, departments and routing rules.

Quick check

You are ready if you know whether callers should reach a person directly, a department, a call queue or a menu. If your current system has confusing call routing, take this chance to simplify it.

9. Check Whether Staff Need Desk Phones, Headsets or Mobile Apps

Microsoft Teams Phone can be used in different ways depending on how your staff work.

Some users may prefer to make calls from their laptop using a headset. Others may need a physical desk phone. Remote and field-based staff may rely on the Teams mobile app.

Before setup, decide what each group of users needs.

Consider:

Will office staff use laptops and headsets?
Does reception need a physical desk phone?
Do managers need to answer calls from mobiles?
Do meeting rooms need shared calling devices?
Do warehouse or workshop areas need shared phones?
Are staff comfortable using the Teams mobile app?
Do users need noise-cancelling headsets?

The right device setup can make a big difference to adoption. If users are used to traditional handsets, moving straight to laptop-only calling may cause frustration. On the other hand, some teams may prefer not having desk phones at all.

Quick check

You are ready if every user type has a clear calling device plan. If you are not sure, start by grouping staff into categories such as reception, office users, remote workers, mobile staff and shared spaces.

10. Review Business Continuity

Your phone system is often one of the most important parts of your business. If customers cannot reach you, enquiries can be missed and service can be affected.

Before moving to Microsoft Teams Phone, think about what happens if something goes wrong.

Ask:

What happens if the office broadband goes down?
Can staff still answer calls from mobiles?
Do you have a backup internet connection?
Who manages call routing if there is an issue?
What happens if a key user is unavailable?
Can calls be redirected quickly?
Are out-of-hours messages easy to update?
Do remote workers have a reliable connection?

Cloud-based phone systems can offer more flexibility than traditional systems, but they still need a continuity plan. For example, if your office connection fails, users may still be able to answer calls from mobile devices or another location. But that only works if the setup has been planned correctly.

Quick check

You are ready if you know how calls will be handled during an outage, office closure or staff absence. If you do not have a plan, build one before switching.

11. Check Compliance, Recording and Reporting Requirements

Some businesses have additional requirements around call recording, reporting, retention or compliance.

This is especially important for sectors such as finance, healthcare, legal services, property, recruitment, customer service and any business that handles sensitive customer information.

Before moving to Microsoft Teams Phone, check whether your business needs:

Call recording
Call reporting
Call analytics
Voicemail management
Audit trails
PCI-compliant payment handling
Data retention policies
Access controls
Secure user management

You should also review who should have access to call data and admin settings. Not every user should be able to change routing, access reports or manage phone numbers.

Quick check

You are ready if you know whether your business has any call recording, compliance or reporting requirements. If you operate in a regulated sector, review this before making changes.

12. Decide Who Will Manage the System

A Microsoft Teams Phone setup needs ongoing management. Someone will need to look after users, numbers, call routing, voicemail, devices and any changes required as the business grows.

This could be handled internally by your IT team, externally by a telecoms provider, or through a managed support arrangement.

Think about who will manage:

New starters and leavers
Phone number changes
Call queue changes
Auto attendant messages
Out-of-hours routing
Device setup
User issues
Call quality problems
Microsoft 365 admin changes
Support requests

If your internal team is already stretched, it may make sense to work with a provider who can support both the telecoms and Microsoft side of the setup.

Quick check

You are ready if you know who will manage the system after it goes live. If there is no clear owner, support issues can become frustrating very quickly.

Microsoft Teams Phone Setup Checklist

Use this quick checklist to see how ready your business is.

1. Teams usage

Staff already use Microsoft Teams regularly
Users are comfortable with Teams meetings and chat
Remote or hybrid workers already use Teams

2. Licensing

You know which users need external calling
You know who needs direct dial numbers
You have reviewed your Microsoft 365 licences
You know whether shared devices are needed

3. Phone numbers

You have a list of all active business numbers
You know which numbers need to be kept
You know where those numbers are advertised
You have checked for unused numbers

4. Contracts

You know your current telecoms provider
You know your contract end date
You have checked for early exit fees
You understand your current telecoms costs

5. Internet and network

Your broadband is stable
Teams meetings already work well
Wi-Fi coverage is strong across the building
You have considered backup connectivity
High-call-volume users have reliable connections

6. Call handling

You have mapped your main call flows
You know which teams answer which calls
You have planned out-of-hours routing
You know whether you need call queues
You know whether you need auto attendants

7. Devices

You know who needs a headset
You know who needs a desk phone
You know who will use the mobile app
Shared areas have been considered

8. Support

You know who will manage the system
You have a plan for user changes
You know who will handle issues after setup

If you can tick most of these boxes, your business is likely in a good position to start planning a Microsoft Teams Phone setup. If several areas are unclear, it may be worth carrying out a proper telecoms review first.

Common Signs Your Business Is Ready for Microsoft Teams Phone

Your business may be ready for Microsoft Teams Phone if:

Your team already uses Microsoft Teams every day
You have remote or hybrid workers
You want fewer separate communication systems
Your current phone contract is coming up for renewal
Your existing phone system feels outdated
You are paying for old lines or unused services
You need better call routing
You want staff to answer calls from laptops or mobiles
You are reviewing your Microsoft 365 setup
You want one platform for meetings, chat and calling

For many businesses, the move is not just about replacing phones. It is about making communication simpler, more flexible and easier to manage.

When Microsoft Teams Phone May Not Be the Right Fit Yet

Microsoft Teams Phone can be a strong option, but it may not be right for every business immediately.

You may need more preparation if:

Your internet connection is unreliable
Your team does not currently use Teams
Your call routing is complex and undocumented
You are tied into a long telecoms contract
You have specialist call centre requirements
You rely heavily on existing desk phones or legacy equipment
You have not reviewed compliance or recording needs
You do not have anyone to manage the system

In these cases, Teams Phone may still be suitable, but it needs careful planning. The most important thing is not to rush the move without understanding what your business actually needs.

Final Thoughts

Microsoft Teams Phone can be a practical way to modernise your business phone system, especially if your team already uses Microsoft Teams and Microsoft 365.

However, a successful Microsoft Teams Phone setup depends on preparation. Before switching, you should review your users, licences, phone numbers, internet connection, call flows, devices and support requirements.

The more clearly you map everything out before the move, the smoother the setup will be.

If your current phone system is coming up for renewal, or you are unsure whether Teams Phone is the right fit, now is a good time to review your options.

At Yellowcom, we help businesses across the UK and Ireland review their telecoms setup, plan cloud phone migrations and choose the right communication solution for their team.

Need help checking whether your business is ready for Microsoft Teams Phone?