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BT Quantum


Powerful, entry-level on-premises system for the small business with up to 48 users



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Big system features without the cost


Twin your mobile with your office phone so both ring on the same number.

Use all of the office phone system features from anywhere with an internet connection; to control and make calls from your computer, and to see who’s available for the next call.

Stand back and let your Quantum manage and route incoming calls automatically. 

We will manage the project, working with you to survey your site and cabling, install the system, bring it online, and train your people. 



Call us to discuss the right solution for your business

Arrange a consultation with your BT Local Business specialist now.

9am-5pm, Monday-Friday

This is a sales number only. Please use these numbers for faults and technical queries.

Book a sales call back

Included as standard

Proactive Remote Monitoring

New! We’ll proactively monitor your phone system round the clock, making sure that everything is always working how it should be.

If we find a problem, PRM will automatically alert our Fault Control Centre, no matter what time or day of the week it is. This means that our engineers can start working on any faults that occur outside of normal working hours, often before you’re even aware of them.

PRM is only available to customers buying a new phone system from 9th February 2016.

One contact number

With 'Mobile twinning' your staff each have just one contact number.

Their office phone and mobile will ring simultaneously when anyone calls. So they don’t even need to be in the building to answer the ‘office’ phone. 

Work from anywhere

To use 'Teleworker' all you need is a broadband connection and an IP phone.  

Desktop control

Manage the system from your PC: dial numbers at the click of a mouse, communicate online,  and see who’s available to talk in real-time.

Integrated voicemail

Get your voicemail delivered as email. Give access to multiple users.

Help and support

Support by phone from dedicated helpdesk and online knowledgebase. 

If you have a fault with your system, we’ll respond by the end of the next working day (excluding public holidays).

Payment options

If you don’t want to pay upfront, we have several finance options to help spread the cost.

Optional extras


When we install the system, we’ll give you an overview of how it works so you’re comfortable with the basics. 

To get the most out of your system, we can run training courses for your advanced users or administrators. BT Quantum training (PDF)


Depending on different roles, choose IP phones, digital, DECT, or softphones. 

Enhanced care options

Choose a service response time to suit your business-

Prompt Care: if you have a fault with your system, we’ll respond within 4 working hours (excluding public holidays).

Total Care: we’ll respond within 4 hours (including public holidays).

SIP trunking with BT SIP Trunk

SIP trunking can help you save money by using your data network to handle all your calls so you no longer need separate phone lines.

BT SIP Trunk channels start at just £8.95 a month, which includes a generous call allowance and free calls between BT SIP Trunks.

Quality is just as important, which is why we offer Quality of Service that ensures calls are prioritised, so quality is not compromised.

You also get more flexibility than with traditional phone lines: you can market your business locally around the country, take your numbers with you if you move, and have your calls diverted to another site in the event of an emergency.

If you’re investing in a data network, SIP trunking makes that investment work harder for you. BT SIP Trunk.

Why BT Business?

Get the right solution for your business from BT Local Business experts
Unbeatable local knowledge, national resources, and personal service
Personal contact helps us get to know you and your business challenges
We’re the leading provider of phone systems in the UK, right on your doorstep


I'm a BT Quantum customer. Where can I find help?

Firstly take a look at our online help.

Still need help? Just get in touch with our helpdesk on
0870 240 8377.

Can I upgrade my existing phone system or purchase replacement handsets?

Please get in touch to discuss.  We no longer sell systems like BCM and BT Versatility but we still fully maintain them (including upgrades and replacement office phones for BT Versatility).

Things you need to know

Legal stuff

Maintenance of Equipment terms can be found here.



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