Company lists · Data refreshed September 2026
Top 25 Unified communications software companies based in the United Kingdom
RevenueBase identified 69 unified communications software companies headquartered in the United Kingdom as of September 2026 and tracks 1,023 professional contacts across them, including 272 with verified work emails and 56 with mobile numbers. London is the largest hub.
This list covers unified communications software companies headquartered in the United Kingdom, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 6, 2026.
Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.
The 25 largest unified communications software companies based in the United Kingdom
Ranked by team size| # | Company | RevenueBase Smart Search | Contacts | ||
|---|---|---|---|---|---|
| 1 | Indirect evidence | 112 contacts → | |||
“HiHi is a leading video-enabled business phone.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 2 | Indirect evidence | 86 contacts → | |||
“Sipcom exists to make you the hero of your business narrative by turning complexity into clarity.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 3 | Strong evidence | 62 contacts → | |||
“Nebula is a leading SaaS provider of workplace communications software, delivering powerful, secure, and adaptable solutions and applications for voice, messaging, customer…” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 4 | Strong evidence | 49 contacts → | |||
“TeleWare design software to help businesses communicate better with their customers and employees by routing communications more effectively.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 5 | Strong evidence | 36 contacts → | |||
“Zest4 are a leading provider of Unified Communications solutions for resellers across the UK.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 6 | Indirect evidence | 32 contacts → | |||
“The Clobba suite has been creating strategies for productivity and efficiency in a digitally connected world for years.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 7 | Partial evidence | 32 contacts → | |||
“We are a leading worldwide provider of cloud-based and customer hosted managed visual communication and collaboration services.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 8 | Strong evidence | 18 contacts → | |||
“Tempura Communications are a leading distributor of Unified Communications including VoIP, connectivity, Audio Visual and video conferencing solutions, supplying over resellers in…” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 9 | Indirect evidence | 17 contacts → | |||
“Practical telecoms and IT solutions that keep your business running smoothly.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 10 | Partial evidence | 15 contacts → | |||
“With over 15 years’ experience in the ever-changing communications industry, IPCortex are proud to provide innovative communication systems and applications that help companies…” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 11 | Strong evidence | 13 contacts → | |||
“Since 2006, Elisha Telecom has been at the forefront of innovation in the field of Unified Communications.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 12 | Partial evidence | 11 contacts → | |||
“Trinsic is a new kind of business communications specialist, built from the ground up to help any company leave behind siloed IT, telephony and mobile comms thinking, and move…” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 13 | Strong evidence | 10 contacts → | |||
“Boom brings together the best of unified communications, software as a service and deep analytics to power businesses of all sizes” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 14 | Indirect evidence | 10 contacts → | |||
“1plex is a Microsoft Teams specialist based in Cambridge, helping organisations transform how they communicate and collaborate.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 15 | Strong evidence | 9 contacts → | |||
“Dimensions Technologies is a leading independent software vendor and Unified Communications as a Service (UCaaS) provider.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 16 | Indirect evidence | 9 contacts → | |||
“StarLeaf enables seamless collaboration through intelligently engineered, reliable meeting room systems, superior video conferencing, and secure messaging.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 17 | Partial evidence | 8 contacts → | |||
“The Technology Group are a managed communications provider, helping businesses and organisations to better communicate with their customers and teams, by embracing voice over IP…” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 18 | Partial evidence | 7 contacts → | |||
“sipsynergy is the new standard in reliable, high quality hosted communications and collaboration.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 19 | Partial evidence | 7 contacts → | |||
“Whether your workforce is office-based, mobile, remote working or a combination of all three a collaborative and connected communications environment has never been more important.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 20 | Partial evidence | 7 contacts → | |||
“Interact Technology has extensive experience derived from over 20 years in providing business to business communications.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 21 | Partial evidence | 7 contacts → | |||
“THE MOBILE FIRST COMMUNICATION PLATFORM WITH FMC & WebRTC Apalo takes smarter communications to the next level, combining a comprehensive set of collaboration tools and rich…” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 22 | Indirect evidence | 6 contacts → | |||
“At VOIspeed Ltd we offer VOIspeed phone system technology, a robust simple yet feature-rich cloud based phone system for SMEs with video, desktop sharing and chat functions, ideal…” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 23 | Strong evidence | 6 contacts → | |||
“Founded in Wavenet has grown from simple beginnings to become one of the UK’s market leaders in unified communications and business telephony solutions.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 24 | Indirect evidence | 5 contacts → | |||
“At Voice Simplified we believe that all businesses, large and small, should be able to communicate without the need for prohibitive and expensive licensing or infrastructure.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 25 | Indirect evidence | 5 contacts → | |||
“Designed to Talk (DTT) has re-designed the way business technology is delivered managed and used.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
RevenueBase Smart Search
RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: unified communications software companies. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.
- Strong evidence
- The company's own public description of its business names unified communications software companies.
- Partial evidence
- Its own public description names part of unified communications software companies, so it works in or next to the category without describing itself that way.
- Indirect evidence
- The description shown does not name unified communications software companies. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.
RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.
Showing 25 of 69 unified communications software companies based in the United Kingdom
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Unified communications software companies based in the United Kingdom at a glance
As of Sep 6, 2026Companies by employee count
Freshness & accuracy
How recently the business emails on this list were verified
Email last verified
How this list was built
Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among unified communications software companies, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.
- Source
- The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
- What qualifies
- Companies headquartered in the United Kingdom whose own description of what they do matches “unified communications software companies”. Matching reads each company's description, not its industry code or its name.
- RevenueBase Smart Search
- RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names unified communications software companies), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
- What we exclude
- Companies whose own description does not clearly place them among unified communications software companies, and records with no verified work email. Companies headquartered outside United Kingdom are excluded even when they keep an office there.
- Match quality
- In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
- Ranking
- Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
- Verification
- Every listed company carries at least one verified work email, 272 across the full list. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
- Refresh
- This page's figures were pulled from the company graph on September 6, 2026. Lists refresh periodically as the graph is re-checked.
- Corrections
- Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.
Frequently asked
What is RevenueBase Smart Search?
RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names unified communications software companies, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.
How many unified communications software companies are there based in the United Kingdom?
RevenueBase identified 69 unified communications software companies headquartered in the United Kingdom as of September 2026, matched on each company's own description of what it does rather than its industry code.
What is the largest company on this list?
HIHI, headquartered in Christchurch, tops this list with the largest team on record.
Which city has the most unified communications software companies?
London leads with 21 headquartered companies, followed by Fareham (3) and Nottingham (3).
How do I get contact information for these companies?
A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 272 verified decision-maker contacts tracked across these 69 companies.
How current is this list?
The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 6, 2026.
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About this data
RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase Smart Search, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.
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