Company lists · Data refreshed September 2026

Top 25 Unified communication vars based in the United Kingdom

Name: Unified communication vars 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 118 companies tracked

RevenueBase identified 118 unified communication vars headquartered in the United Kingdom as of September 2026 and tracks 2,517 professional contacts across them, including 1,211 with verified work emails. London is the largest hub.

This list covers unified communication vars 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

118Companies

2,517Contacts tracked

1,211Verified emails

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The 25 largest unified communication vars based in the United Kingdom

Ranked by team size

Top 25 of 118 unified communication vars 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 communication vars: 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	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
2	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
3	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
4	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
5	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
6	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
7	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
8	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
9	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
10	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
11	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
12	Pinnaca	Partial evidence	Slough, United KingdomHQ checked Sep 22, 2026	51-200	32 contacts →
	Partial evidence “We are a leading worldwide provider of cloud-based and customer hosted managed visual communication and collaboration services.” Source: RevenueBase Database · checked Sep 22, 2026
13	Radius Connect Solutions Ireland	Indirect evidence	Belfast, United KingdomHQ checked Sep 22, 2026	11-50	26 contacts →
	Indirect evidence “Welcome to Radius Connect Solutions.” Source: RevenueBase Database · checked Sep 22, 2026
14	Marlin Communications	Partial evidence	Bath, United KingdomHQ checked Sep 22, 2026	11-50	22 contacts →
	Partial evidence “Marlin Communications is a UK-based, single-source provider of business communications technology solutions that helps organisations improve customer experiences and optimise how…” Source: RevenueBase Database · checked Sep 22, 2026
15	Meetingzone	Indirect evidence	Thame, United KingdomHQ checked Sep 22, 2026	51-200	18 contacts →
	Indirect evidence “MeetingZone was set up in 2002 and has operations in the UK, Germany, USA, Nordics and Asia Pacific.” Source: RevenueBase Database · checked Sep 22, 2026
16	Conversant Technology	Partial evidence	Bristol, United KingdomHQ checked Sep 22, 2026	11-50	17 contacts →
	Partial evidence “Conversant Technology empowers businesses with digital-first communication solutions, built on the strength of Microsoft Teams.” Source: RevenueBase Database · checked Sep 22, 2026
17	Yestech	Indirect evidence	Fareham, United KingdomHQ checked Sep 22, 2026	1-10	17 contacts →
	Indirect evidence “Practical telecoms and IT solutions that keep your business running smoothly.” Source: RevenueBase Database · checked Sep 22, 2026
18	Green IP	Partial evidence	Poole, United KingdomHQ checked Sep 22, 2026	11-50	15 contacts →
	Partial evidence “Communications Reimagined.” Source: RevenueBase Database · checked Sep 22, 2026
19	VTSL	Partial evidence	London, United KingdomHQ checked Sep 22, 2026	11-50	15 contacts →
	Partial evidence “VTSL Ltd is a leading cloud communications company in the UK & Ireland.” Source: RevenueBase Database · checked Sep 22, 2026
20	Ipcortex	Partial evidence	Milton Keynes, United KingdomHQ checked Sep 22, 2026	11-50	15 contacts →
	Partial evidence “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: RevenueBase Database · checked Sep 22, 2026
21	Elisha Telecom	Strong evidence	London, United KingdomHQ checked Sep 22, 2026	11-50	13 contacts →
	Strong evidence “Since 2006, Elisha Telecom has been at the forefront of innovation in the field of Unified Communications.” Source: RevenueBase Database · checked Sep 22, 2026
22	Qwil Messenger	Partial evidence	London, United KingdomHQ checked Sep 22, 2026	11-50	12 contacts →
	Partial evidence “Provide your clients with exceptional communication experience from prospect to long term client.” Source: RevenueBase Database · checked Sep 22, 2026
23	Trinsic	Partial evidence	Fareham, United KingdomHQ checked Sep 22, 2026	11-50	11 contacts →
	Partial evidence “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: RevenueBase Database · checked Sep 22, 2026
24	Swains, Part Of The Wavenet Group	Indirect evidence	Solihull, United KingdomHQ checked Sep 22, 2026	51-200	11 contacts →
	Indirect evidence “Swains was acquired by Wavenet in June 2017.” Source: RevenueBase Database · checked Sep 22, 2026
25	Boom Coms Limited	Strong evidence	Basingstoke, United KingdomHQ checked Sep 22, 2026	11-50	10 contacts →
	Strong evidence “Boom brings together the best of unified communications, software as a service and deep analytics to power businesses of all sizes” 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 communication vars. 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 communication vars.
Partial evidence: Its own public description names part of unified communication vars, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name unified communication vars. 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 118 unified communication vars based in the United Kingdom

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Unified communication vars based in the United Kingdom at a glance

As of Sep 22, 2026

48.1%Verified-email coverage

21.3Average contacts per company

11-50Median size (employees)

33.1%Largest-city concentration · London

Sep 22, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

1,001-5,000

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 118 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 communication vars, 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 communication vars”. 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 communication vars), 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 communication vars, 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, 1,211 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 communication vars by metro

Unified communication vars in London39

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 communication vars, 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 communication vars are there based in the United Kingdom?

RevenueBase identified 118 unified communication vars 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?

Wavenet, headquartered in Solihull, tops this list with the largest team on record.

Which city has the most unified communication vars?

London leads with 39 headquartered companies, followed by Birmingham (3) and Fareham (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 1,211 verified decision-maker contacts tracked across these 118 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.