Large Business Phone Systems: Enterprise VoIP for Every Site and Team
If your organisation runs several sites, departments and contact centre teams, and you need one phone system that keeps them all connected, then give our expert team a call. Since 2004, we have been setting up cloud phone systems for UK businesses, from single offices to organisations spread across the country.
Call us on 01325 647000.
What Do We Class as a Large Business Phone System?
A large business phone system is a cloud platform that connects hundreds or even thousands of users across head offices, branches, contact centres and home workers. Every site shares one set of numbers, rules and reports. Instead of separate systems at each office, the whole organisation has one directory, one administration portal and one support team.
Calls can be routed by department, skill, language or account, and the same platform runs office calling, video meetings, team chat and a full contact centre. For IT teams, that means one contract, one service level and one place to add users, change call flows or pull reports. For the business, customers reach the right person faster and managers see what is happening at every site. The system also grows with each new office, without new hardware.
Running a smaller team? Our guides to small business phone systems and SME phone systems may suit you better.
Where Large Phone Estates Start to Struggle
As organisations grow through new offices, mergers and hybrid working, phone systems tend to grow in pieces. Here is what that looks like, and what changes when every site shares one platform.
Six systems, six contracts and no single view
One platform, one contract and one service level
Cost and Control
When every office has its own phone system, supplier and contract, nobody has a full picture of the estate. Moving a team or opening a new office can mean new hardware, engineer visits and weeks of waiting.
Customer Experience
Customers are passed between departments and repeat their details because calls cannot reach the right person first time. Contact centre figures sit in one tool and office calling in another, and managers cannot compare sites fairly.
Compliance and Risk
Recording rules, retention periods and card payment handling often differ by site, which makes audits slow and risky. Staff switch between separate apps for calls, meetings and chat, and IT supports several platforms with different logins.
One cloud phone system brings every site, team and contract together.
One Platform for Every Team in Your Organisation
Office staff, contact centre agents, customer-facing experts and IT administrators each get the tools they need, all on the same platform. Find out more about UCaaS and CCaaS.
Calling, Meetings and Chat in One App
Staff make calls, join video meetings and message colleagues from one desktop app, desk phone or web browser, keeping the same business number wherever they work.
- HD calling on desk phones and laptops
- Video meetings for up to 500 people
- Team chat with presence
- Voicemail transcribed to email
A Full Contact Centre on the Same Platform
Voice, web chat, email and messaging queues sit in one agent workspace, with call-back, outbound dialling and supervisor tools for large customer service teams.
- Omnichannel routing and queues
- Queued call-back for busy periods
- Outbound campaign dialler
- Workforce management links
Experts Outside the Contact Centre
Account managers, engineers and advisers take customer calls with simple queues and AI insight, without the cost of full contact centre licences.
- Self-managed queues
- AI routing to the right expert
- Call summaries and sentiment
- Video and chat with customers
One Portal to Run the Whole Estate
IT teams add users, move numbers, change call flows and pull reports for every site from one administration portal, with no on-site phone systems to maintain.
- One admin portal for every site
- Number porting and provisioning
- Analytics across all communications
- Open APIs for your own software
Clear Reporting for Directors
Directors see service levels, call volumes and missed calls by site or department, and conversation intelligence turns calls and meetings into insight about accounts and customers.
- Reports by site and department
- Scheduled reports by email
- Conversation intelligence
- Post-call customer surveys
Built to Stay Up When It Matters Most
Large organisations cannot afford a phone outage. The cloud platform behind our systems carries a financially backed 99.999% uptime service level across calls, meetings and the contact centre.
- Network monitored around the clock
- Public service status page
- UK data held in UK data centres
Geographic
Every layer is replicated across separate locations, including data centres in the UK.
Data
Mirrored data sources keep records consistent across redundant systems.
Platform
Self-healing services run active-active across regions and scale with demand.
Infrastructure
Fully redundant equipment provides the foundation for high availability.
AI That Works Across the Whole Business
Follow a single customer call to see where AI helps, from the first ring to the follow-up the next morning.
- 1
Answered at Any Hour
An AI agent greets the caller and handles routine requests such as order updates or account questions.
- 2
Routed to the Right Expert
When a person is needed, AI routing finds the most suitable colleague in any department by skill, language or account.
- 3
Summarised Automatically
After the call, a transcript and a summary with action items are created and can be saved to your CRM.
- 4
Checked for Quality
Speech and sentiment analytics score the call against your own standards and show where coaching will help.
- 5
Turned Into Insight
Managers can ask about any account and get answers drawn from real calls and meetings, including early signs that a customer may leave.
Critical Alerts for Every Worker
In an emergency, alerts reach staff by call, message or app, and acknowledgements are tracked and escalated until everyone has responded.
Works With the Tools Your Teams Already Use
Business calling and the contact centre can run inside Microsoft Teams, letting staff keep the app they know while calls run on a resilient business phone platform.
More than 50 ready-made integrations connect CRM, helpdesk and workforce management systems, and open APIs let your developers build calling, messaging and video into your own software.
Customer records appear on screen as calls arrive, and calls can be logged against helpdesk tickets automatically.
Security and Compliance for Regulated Organisations
Financial services, healthcare, public bodies and other regulated organisations need clear answers on data, recording and payments. Here is how the platform handles them.
Certified Platform. The platform holds ISO 27001, ISO 27017, SOC 2 and Cyber Essentials certifications, and personal data is handled in line with UK GDPR.
Secure Card Payments. PCI DSS compliant payments during calls keep card details away from agents and call recordings.
Recording and Retention. Record by user or team with VoIP call recording, kept for 30 days and extendable to 180 days, with cold storage for up to 10 years.
UK Data Residency. UK customer data is held in UK data centres, and video meetings use end-to-end encryption.
Connectivity Planned for Every Site
Call quality depends on the network as much as the phone system. We check each site's connection and call volumes before you switch, and recommend backup connections wherever losing the internet would stop the business.
FTTC and SoGEA
Smaller branches
Dependable calling at a sensible cost for smaller sites with a few users.
See FTTC and SoGEA broadbandFull Fibre
Regional offices
Plenty of room for calls, video meetings and cloud software at the same time, at a lower cost than a leased line.
Explore fibre broadbandLeased Lines
Dedicated and uncontended
The same upload and download speeds at all hours, backed by a service level agreement with a fixed repair target.
Find out about leased linesHow We Move a Large Business Onto One Platform
Large moves run most smoothly in planned stages, with one site proving the setup before the rest follow.
Ready to Use From Day One
Desk phones arrive set up with each user’s number, queues and settings, and most work within minutes of being plugged in. The desktop app puts the same business number on any laptop with a headset.
Reception teams can see who is free at every site before transferring a call, and staff can move between the desk phone and the app during the day.
- 1
Discovery and Audit
We review your numbers, sites, contracts, call volumes and integrations, and note where calls are lost today.
- 2
Design
Numbering plans, call flows, queues, recording rules and admin roles are agreed with each department.
- 3
Pilot Site
One office or team goes live first, and their feedback shapes the wider rollout.
- 4
Phased Rollout
Sites move in planned waves, with numbers transferred at quiet times.
- 5
Training
Agents, supervisors, receptionists and administrators learn the parts of the system they use most.
- 6
Ongoing Reviews
Our UK-based team supports you day to day and reviews the setup as you add sites and users.
We support large organisations in every sector. Our guides cover just some of them, and our Areas We Cover page shows how we look after businesses across the UK.
What Our Customers Say About Working With Us
Whatever your size, you deal with the same friendly UK-based team from your first call to day-to-day support.
Blake Telecom have been supplying our business communications for well over 10 years. We have found both their systems and support to be fully robust and they have given an excellent service throughout with value for money for their products. Their approach to helping our business has always been excellent from every aspect and I would highly recommend their services.
Blake Telecom have been paramount to the growth of our business by continuing to offer our business the very highest level of service. The equipment we have been supplied has been extremely flexible allowing us to change needs. Blake Telecom’s knowledge and expertise has been very professional and we look forward to working together on our future projects.
Blake Telecom have revolutionised the way we operate. They have gone the extra mile in making the setup process painless and it was easy to install. Any questions are dealt with quickly and efficiently, and the staff are a pleasure to deal with. I truly wish we found them years ago. We recommend Blake Telecom to many of our suppliers and even customers whenever we can.
The three awards above were won by the cloud platform we supply.
Questions Large Businesses Ask Us
Here are the questions IT, operations and finance teams ask us most before they switch.
What is a large business phone system?
It is a cloud phone platform that connects hundreds or even thousands of users across head offices, branches, contact centres and home workers, with one directory, one set of call rules and one administration portal.
How many users can one system support?
One platform can support thousands of users across many sites. New users, numbers and sites are added in minutes through the admin portal, with no new hardware on site.
Can we keep our existing numbers at every site?
Usually, yes. We transfer numbers in planned waves, one site or department at a time and at quiet times, and callers keep reaching you throughout.
How reliable is a cloud phone system for a large organisation?
The platform behind our systems carries a financially backed 99.999% uptime service level across calls, meetings and the contact centre, with redundancy at the infrastructure, platform, data and geographic levels.
Does it work with Microsoft Teams?
Yes. Business calling and the contact centre can run inside Microsoft Teams, letting staff keep the app they know while calls run on the cloud phone platform.
Can our contact centre run on the same platform?
Yes. Office calling, video meetings, chat and a full omnichannel contact centre share one platform, one contract and one service level.
How does AI routing work?
AI routing matches each caller to the most suitable available person in any department, using skills, language and account details, and it suggests skill updates as patterns change.
Is the platform secure and compliant?
Yes. It holds ISO 27001, ISO 27017, SOC 2 and Cyber Essentials certifications, supports PCI DSS compliant card payments and keeps UK customer data in UK data centres.
Can we record calls for compliance?
Yes. You choose which users or teams are recorded, and recordings are kept for 30 days, which can be extended to 180 days, with cold storage for up to 10 years.
How long does a large rollout take?
Most large moves run in phases over several weeks or months, depending on the number of sites. We start with a pilot site, then move the rest in planned waves.
What connectivity do our sites need?
Head offices and contact centres usually run on leased lines for dedicated, symmetrical speeds, while smaller branches often use full fibre. We check each site and recommend backup connections where needed.
How much does a large business phone system cost?
Plans start from £8.99 a month per user, and the total depends on the number of users, the features each team needs and your connectivity.
Let’s Plan the Right Phone System for Your Organisation
Tell us about your sites, teams, call volumes and the systems you use today, and we will suggest a practical design with a clear quote to match.
Once you say go, we handle design, number transfers, training and support, with one UK-based team looking after every site.
Our team is available Monday to Friday, 9am to 5.30pm.
- UK-based support from day one
- Numbers moved in planned waves
- One portal for every site
- Contact centre and AI on the same platform
- Plans from £8.99 a month per user
Reviewed by Glenda Jackson, Designer at Blake Telecom, on 20/10/2026.
