Company lists · Data refreshed September 2026

Top 25 Unified communications companies based in the United Kingdom

Name: Unified communications companies based in the United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 22, 2026 376 companies tracked

RevenueBase identified 376 unified communications companies headquartered in the United Kingdom as of September 2026 and tracks 7,550 professional contacts across them, including 3,265 with verified work emails. London is the largest hub.

This list covers unified communications 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 22, 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.

How to read this list HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Sep 22, 2026 86% judged on-target in blind review

376Companies

7,550Contacts tracked

3,265Verified emails

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The 25 largest unified communications companies based in the United Kingdom

Ranked by team size

Top 25 of 376 unified communications companies based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 22, 2026. RevenueBase Smart Search rates how each company's information relates to unified communications companies: strong evidence (its own description names it), partial (names part of it), indirect (matched on the rest of its profile rather than the description shown). Click a contact count to view that company's people.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	GAMMA	Partial evidence	London, United KingdomHQ checked Sep 22, 2026	1,001-5,000	1,568 contacts →
	Partial evidence “Gamma Communications is a leading provider of technology-based communication solutions across Europe.” Source: RevenueBase Database · checked Sep 22, 2026
2	Wavenet	Indirect evidence	Solihull, United KingdomHQ checked Sep 22, 2026	1,001-5,000	927 contacts →
	Indirect evidence “Since we’ve been helping organisations stay connected, protected and ready for what comes next.” Source: RevenueBase Database · checked Sep 22, 2026
3	Onecom	Partial evidence	Fareham, United KingdomHQ checked Sep 22, 2026	501-1,000	655 contacts →
	Partial evidence “Onecom is the UK’s leading business telecoms and cloud communications provider managing over a million services for business customers - delivering communication services and…” Source: RevenueBase Database · checked Sep 22, 2026
4	Elite Group	Indirect evidence	Chorley, United KingdomHQ checked Sep 22, 2026	51-200	148 contacts →
	Indirect evidence “Great technology matters, but it’s great people who make it work.” Source: RevenueBase Database · checked Sep 22, 2026
5	NTT Ltd. Collaboration & CX	Indirect evidence	London, United KingdomHQ checked Sep 22, 2026	10001+	120 contacts →
	Indirect evidence “The Collaboration and CX solutions offered by NTT Ltd.” Source: RevenueBase Database · checked Sep 22, 2026
6	Tela Technology	Partial evidence	Hampton-in-arden, United KingdomHQ checked Sep 22, 2026	51-200	111 contacts →
	Partial evidence “We provide communication solutions and IT business services to businesses, big and small, to help your business grow.” Source: RevenueBase Database · checked Sep 22, 2026
7	Sipcom	Indirect evidence	London, United KingdomHQ checked Sep 22, 2026	501-1,000	86 contacts →
	Indirect evidence “Sipcom exists to make you the hero of your business narrative by turning complexity into clarity.” Source: RevenueBase Database · checked Sep 22, 2026
8	Gradwell	Partial evidence	Bath, United KingdomHQ checked Sep 22, 2026	51-200	85 contacts →
	Partial evidence “Gradwell Communications Ltd are a leading cloud communications solutions provider with a focus on small to medium-sized businesses (SMEs).” Source: RevenueBase Database · checked Sep 22, 2026
9	Telappliant	Partial evidence	London, United KingdomHQ checked Sep 22, 2026	51-200	67 contacts →
	Partial evidence “Telappliant is an award-winning VoIP and cloud communications provider.” Source: RevenueBase Database · checked Sep 22, 2026
10	Britannic	Partial evidence	Guildford, United KingdomHQ checked Sep 22, 2026	51-200	65 contacts →
	Partial evidence “A leading Systems Integrator and Technology Innovator trusted by world class brands for over 40 years, Britannic designs, develops and delivers business communications, sovereign…” Source: RevenueBase Database · checked Sep 22, 2026
11	Nebula	Partial evidence	Guildford, United KingdomHQ checked Sep 22, 2026	51-200	62 contacts →
	Partial evidence “Nebula is a leading SaaS provider of workplace communications software, delivering powerful, secure, and adaptable solutions and applications for voice, messaging, customer…” Source: RevenueBase Database · checked Sep 22, 2026
12	Enconvo UK	Strong evidence	Telford, United KingdomHQ checked Sep 22, 2026	51-200	61 contacts →
	Strong evidence “We’re a leading unified communications provider supplying over 2 million users with the technology they need to work their magic.” Source: RevenueBase Database · checked Sep 22, 2026
13	Windsor Telecom	Indirect evidence	Camberley, United KingdomHQ checked Sep 22, 2026	51-200	57 contacts →
	Indirect evidence “Windsor Telecom believes that technology should be easy and enjoyable.” Source: RevenueBase Database · checked Sep 22, 2026
14	Firstcom Europe LTD	Indirect evidence	Bolton, United KingdomHQ checked Sep 22, 2026	51-200	56 contacts →
	Indirect evidence “We have over 20 years' experience of working to deliver best of breed cloud telephony solutions to B2B clients.” Source: RevenueBase Database · checked Sep 22, 2026
15	Cellular Solutions	Partial evidence	Sunderland, United KingdomHQ checked Sep 22, 2026	n/a	56 contacts →
	Partial evidence “Established in 1995, Cellular Solutions NE, now part of Communications Plus, is a trusted business telecoms provider supporting organisations across the North East and throughout…” Source: RevenueBase Database · checked Sep 22, 2026
16	SCB Global LTD	Partial evidence	London, United KingdomHQ checked Sep 22, 2026	51-200	52 contacts →
	Partial evidence “SCB Global is a leading global provider of collaboration and communication solutions native inside Microsoft Teams, delivering workplace transformation for the dynamic workforce.” Source: RevenueBase Database · checked Sep 22, 2026
17	Visavvi, An SCC Business	Partial evidence	York, United KingdomHQ checked Sep 22, 2026	51-200	47 contacts →
	Partial evidence “We are the newest and most exciting name in the dynamic world of #audiovisual, business #communication and #collaboration.” Source: RevenueBase Database · checked Sep 22, 2026
18	Microtalk	Partial evidence	London, United KingdomHQ checked Sep 22, 2026	11-50	45 contacts →
	Partial evidence “Microtalk: Global Communications Made Simple For over 15 years, Microtalk has delivered reliable voice, messaging, and cloud communications to businesses worldwide.” Source: RevenueBase Database · checked Sep 22, 2026
19	XINIX	Strong evidence	London, United KingdomHQ checked Sep 22, 2026	11-50	43 contacts →
	Strong evidence “Xinix is UK’s leading cloud-based unified communication provider making persistent efforts towards modernizing business communications.” Source: RevenueBase Database · checked Sep 22, 2026
20	Amillan Limited	Partial evidence	Solihull, United KingdomHQ checked Sep 22, 2026	51-200	42 contacts →
	Partial evidence “Amillan is a communications integrator that delivers solutions to make your organisation perform better.” Source: RevenueBase Database · checked Sep 22, 2026
21	Isdm Solutions	Indirect evidence	Belfast, United KingdomHQ checked Sep 22, 2026	51-200	41 contacts →
	Indirect evidence “ISDM Solutions is a systems integration, management and cloud video service provider, specialising in the delivery of AV and VC projects.” Source: RevenueBase Database · checked Sep 22, 2026
22	PSU Technology Group LTD	Indirect evidence	Cheltenham, United KingdomHQ checked Sep 22, 2026	51-200	38 contacts →
	Indirect evidence “PSU supplies and supports business technology that is essential to our customers' operational needs, today and for the future, without ever compromising on quality service.” Source: RevenueBase Database · checked Sep 22, 2026
23	Zest4	Strong evidence	Wilmslow, United KingdomHQ checked Sep 22, 2026	11-50	36 contacts →
	Strong evidence “Zest4 are a leading provider of Unified Communications solutions for resellers across the UK.” Source: RevenueBase Database · checked Sep 22, 2026
24	SVL	Strong evidence	East Kilbride, United KingdomHQ checked Sep 22, 2026	11-50	36 contacts →
	Strong evidence “As the UK and Ireland’s longest serving trusted advisor to the Contact Centre industry, SVL has grown to become a leading provider of unified cloud communications and telephony…” Source: RevenueBase Database · checked Sep 22, 2026
25	Comtec Enterprises LTD	Strong evidence	Reigate, United KingdomHQ checked Sep 22, 2026	11-50	36 contacts →
	Strong evidence “We specialise in providing unified communication, technology and datacentre services to businesses operating within the private and public sectors throughout the UK and across the…” Source: RevenueBase Database · checked Sep 22, 2026

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 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 companies.
Partial evidence: Its own public description names part of unified communications 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 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 376 unified communications companies based in the United Kingdom

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Unified communications companies based in the United Kingdom at a glance

As of Sep 22, 2026

43.2%Verified-email coverage

20.1Average contacts per company

11-50Median size (employees)

20.5%Largest-city concentration · London

Sep 22, 2026Page data refreshed

Companies by employee count

1-10

156

11-50

159

51-200

201-500

501-1,000

1,001-5,000

5,001-10,000

10001+

Email recency for this list is measured worldwide rather than for United Kingdom, so it is reported there. Company counts and contact totals on this page are exact for United Kingdom, over 376 companies.

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 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 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 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 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, 3,265 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 22, 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.

Unified communications companies by metro

Unified communications companies in London77

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 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 companies are there based in the United Kingdom?

RevenueBase identified 376 unified communications 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?

GAMMA, headquartered in London, tops this list with the largest team on record.

Which city has the most unified communications companies?

London leads with 77 headquartered companies, followed by Birmingham (8) and Sheffield (7).

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 3,265 verified decision-maker contacts tracked across these 376 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 22, 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.