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Call centre phone systems

Mitel’s high-end, on-premises phone system, for large businesses and call centres


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A feature-rich system for thousands of users

MiVoice Business from Mitel is the high-end system for the big business with complex communication demands. Capable of managing thousands of users, it’s a feature-rich, versatile system, with the security of an on-premises installation. It can even be utilised as a conference phone.

And now when you buy one of our selected handsets, we'll throw in a second one free.

From £4,835 (ex VAT)

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The premium communications system for large business

It’s our flagship PBX solution, with intelligent call handling, remote worker capability, and free intra-business calling. And because you’ll only need a single network for your voice and data, you can consolidate your communications estate, courtesy of Mitel’s holistic phone system.

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

Included as standard

Proactive Remote Monitoring

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.


Integrated voice and email

Voicemail delivered directly to your email inbox.

Work from anywhere as if you were in the office

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


Empower your people to work together efficiently with audio and video conferencing.

Single number for mobile and desk phone

Customers only need to call one number to reach your employees mobile and desk phone.


Door entry system

You can gain quick, secure and remote access to your premises.


Payment options

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

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).


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

To help your people get the most out of your system we offer flexible web or onsite training that's personalised to your individual needs.  

Optional extras

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).

Make calls over the internet with BT Cloud Voice SIP

Spend less on business calls and get more flexibility. Give your phone system the power of the cloud.

With BT Cloud Voice SIP, your calls are made over your internet connection, rather than over a traditional phone line. And because calls are always prioritised over other internet traffic, you’ll always have a great connection.

You can have as many numbers as you like – without paying for separate phone lines. You can market your business locally around the country, take your numbers with you if you move, and divert your calls to another site hassle free.

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

On-hold music, messaging and voice recording

We have a range of on-hold and messaging services, including:

  • Professional greeting messaging
  • Digital memory playback devices so you can produce customised on-hold marketing messages and rapidly change your copyright-free music
  • Fully-managed suite of messaging services: regular update of on-hold music plus scheduled marketing messages

Voice recording

Call recording services on analogue, ISDN2, ISDN 30, and SIP lines for all types of business: single user, SME, and corporate. 

  • Call recording options including on-demand, all-calls, selected-extensions, and mobiles
  • Help with PCI compliance
  • Training and evaluating staff
  • Speech analytics
  • Workforce optimisation recording

Unified Communicator

Get a screen-pop showing all your caller’s details before you answer a call. The BT Unified Communicator software connects your agents’ PC desktops to the phone system and your database (or Outlook).

  • Dial from an address book, Outlook, or CRM contact page
  • Send and receive internal messages
  • Each user has a companywide view of the status of their colleagues (so they know whether to call, transfer or send messages to them)
  • Windows and MAC desktop clients
  • Attendant console for complete companywide visibility and control

Secure Access Control

Access control options from a simple, single button intercom-based solution to complete access control systems. 

  • Access control systems connected to analogue or SIP extensions
  • Link to BT-installed lock mechanisms that allow people to control the lock from their BT phone handset
  • Options for internal cameras that display images of visitors on your PC screen
Audio Visual ringing options

Loud rings and flashing lights for noisy areas where people can’t normally hear the phone ring.

  • Analogue and SIP loud ringing devices
  • LED strobe units that flash simultaneously with the handset ring in noisy areas
  • Paging units so you can make announcements directly from your phone handset (for use in production areas and waiting rooms).
  • Range of IP paging systems
  • Interface to connect existing PA systems to your new BT IP phone system, if needed


Choose from a wide range of corded and wireless headsets from well-known brands such as Jabra and Plantronics, including mono, duo, and premium options. 

DECT handsets

DECT handsets are high-quality cordless phones that use Digital Enhanced Cordless Telecommunications technology, which is compatible with all of our phone systems including the MiVoice Business, and Avaya IP Office.

Structured cabling

With structured cabling there is no need for independent voice and data wiring; structured cabling accommodates both. And it allows you to carry out your own moves and changes.  

Consider structured cabling if you’re -

  • Changing to an IP phone system (including BT Cloud Voice)
  • Moving premises
  • Kitting out a new building or greenfield site (we’ll give you a quote based on plans and drawings)
  • Planning an office refurbishment or reorganisation
  • Struggling with bandwidth-hungry applications like video conferencing or data streaming and you need faster servers and PCs

Why BT for structured cabling?

  • Our pricing includes all of the cabling components you’ll need to support the new phone system/LAN/cloud solution
  • We have specialist structured cabling engineers
  • Our cabling and associated products come with a 25-year warranty
  • We co-ordinate the installation with your other BT products
Call Accountant

Stay on top of every call and control your costs.

Get the big picture on all the calls coming in and going out of your business. Find out your busiest times of the day, discover the cost of outgoing calls split by department, and everything in between

Why BT Business?

Local expertise

Get the right solution for your business from BT Local Business experts

Outstanding service

Unbeatable local knowledge, national resources, and personal service

The personal touch

We’ll get to know you and your business challenges

Industry leader

We’re the UK’s leading provider of phone systems


I'm an IP Office 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 0800 378 822.

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).


Stay connected wherever you are in the office with Business DECT

A system that grows with your business and improves customer service

Find out more about their cost-effective solution

Ring the changes: make your phones work harder

Improve your customer service, protect your staff

Keep your business secure with our entry systems

Control your costs and improve customer service with CallAccountant

Programme your perfect phone with our customisable Mitel MiVoice 5300 handsets

Answer every customer, however they call, with Mitel MiVoice 6900 Series IP phones.

Things you need to know

Legal stuff

Prices exclude VAT of 20%

Maintenance of Equipment terms can be found here

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