Company lists · Data refreshed August 2026

Top 25 Cloud communication software companies based in the United Kingdom

Name: Cloud communication software companies based in the United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Aug 31, 2026 234 companies tracked

RevenueBase identified 234 cloud communication software companies headquartered in the United Kingdom as of August 2026 and tracks 5,769 professional contacts across them, including 2,128 with verified work emails and 728 with mobile numbers. London is the largest hub.

This list covers cloud communication 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 August 31, 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 RevenueBase Smart Search rating on every row Refreshed Aug 31, 2026 86% judged on-target in blind review

234Companies

5,769Contacts tracked

2,128Verified emails

728Mobile numbers

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The 25 largest cloud communication software companies based in the United Kingdom

Ranked by team size

Top 25 of 234 cloud communication software companies based in the United Kingdom, ranked by team size, largest first. Data refreshed Aug 31, 2026. RevenueBase Smart Search rates how each company's information relates to cloud communication software 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	Shoretel	Indirect evidence	White Waltham Maidenhead, United Kingdom	1,001-5,000	690 contacts →
	Indirect evidence “ShoreTel is now part of Mitel.” Source: RevenueBase Database · checked Aug 31, 2026
2	Onecom	Strong evidence	Whiteley, United Kingdom	501-1,000	650 contacts →
	Strong 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 Aug 31, 2026
3	Alianza	Partial evidence	Enfield, United Kingdom	501-1,000	605 contacts →
	Partial evidence “Empowering service provider growth with the world’s most trusted Intelligent Communications Fabric.” Source: RevenueBase Database · checked Aug 31, 2026
4	Imimobile Part Of Webex	Indirect evidence	London, United Kingdom	1,001-5,000	436 contacts →
	Indirect evidence “We've moved!” Source: RevenueBase Database · checked Aug 31, 2026
5	Calltower	Strong evidence	London, United Kingdom	201-500	226 contacts →
	Strong evidence “Since 2002, CallTower has been at the forefront of transforming global communication, emerging as a leader in enterprise-class cloud communication, collaboration, and CX solutions.” Source: RevenueBase Database · checked Aug 31, 2026
6	Hiya INC	Partial evidence	London, United Kingdom	51-200	201 contacts →
	Partial evidence “At Hiya, we are revolutionizing the voice communication experience, making it more productive and secure.” Source: RevenueBase Database · checked Aug 31, 2026
7	Synacor	Strong evidence	London, United Kingdom	201-500	182 contacts →
	Strong evidence “Synacor is a cloud-based software and services company headquartered in Buffalo, New York with offices across the globe.” Source: RevenueBase Database · checked Aug 31, 2026
8	Vocovo	Partial evidence	Cheltenham, United Kingdom	51-200	165 contacts →
	Partial evidence “VoCoVo is a globally recognised innovative retail team communication solutions provider, improving business efficiency and customer experience for some of the best-known tier 1…” Source: RevenueBase Database · checked Aug 31, 2026
9	Luware	Strong evidence	London, United Kingdom	51-200	154 contacts →
	Strong evidence “Luware builds intelligent, cloud-native CX solutions that unlock the full potential of Microsoft Teams for enterprise communication.” Source: RevenueBase Database · checked Aug 31, 2026
10	Elite Group	Indirect evidence	Chorley, United Kingdom	51-200	151 contacts →
	Indirect evidence “Great technology matters, but it’s great people who make it work.” Source: RevenueBase Database · checked Aug 31, 2026
11	Daktela	Indirect evidence	Chester, United Kingdom	51-200	98 contacts →
	Indirect evidence “Daktela is all-in-one contact center solution perfectly suited for small and mid-size businesses.” Source: RevenueBase Database · checked Aug 31, 2026
12	Metaswitch Networks	Strong evidence	Enfield, United Kingdom	501-1,000	92 contacts →
	Strong evidence “Metaswitch is a recognized leader in the development of ultra-high-performance, cloud native communications software.” Source: RevenueBase Database · checked Aug 31, 2026
13	Wavecrest	Indirect evidence	London, United Kingdom	51-200	92 contacts →
	Indirect evidence “Wavecrest is a global managed voice and messaging services company.” Source: RevenueBase Database · checked Aug 31, 2026
14	Gradwell	Strong evidence	West Bath, United Kingdom	51-200	85 contacts →
	Strong 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 Aug 31, 2026
15	Sipcom	Indirect evidence	London, United Kingdom	501-1,000	84 contacts →
	Indirect evidence “Sipcom exists to make you the hero of your business narrative by turning complexity into clarity.” Source: RevenueBase Database · checked Aug 31, 2026
16	Telappliant	Strong evidence	Manchester, United Kingdom	51-200	67 contacts →
	Strong evidence “Telappliant is an award-winning VoIP and cloud communications provider.” Source: RevenueBase Database · checked Aug 31, 2026
17	Britannic	Partial evidence	Guildford, United Kingdom	51-200	65 contacts →
	Partial evidence “At Britannic, we are dedicated to revolutionising business communications and driving digital transformation.” Source: RevenueBase Database · checked Aug 31, 2026
18	Nebula	Strong evidence	Guildford, United Kingdom	51-200	60 contacts →
	Strong 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 Aug 31, 2026
19	Digitalk	Strong evidence	Milton Keynes, United Kingdom	51-200	58 contacts →
	Strong evidence “Digitalk, a Hansen Technologies company, enables communications service providers worldwide to operate efficient and innovative services profitably with its Carrier Cloud and…” Source: RevenueBase Database · checked Aug 31, 2026
20	Firstcom Europe LTD	Partial evidence	Bolton, United Kingdom	51-200	55 contacts →
	Partial evidence “We have over 20 years' experience of working to deliver best of breed cloud telephony solutions to B2B clients.” Source: RevenueBase Database · checked Aug 31, 2026
21	Unify Square	Indirect evidence	Leeds, United Kingdom	n/a	44 contacts →
	Indirect evidence “Unify Square joined Unisys in June 2021 to help our clients create breakthrough employee experiences across devices and platforms as workflows change and evolve.” Source: RevenueBase Database · checked Aug 31, 2026
22	Microtalk	Strong evidence	London, United Kingdom	11-50	44 contacts →
	Strong 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 Aug 31, 2026
23	Sytel LTD	Partial evidence	Aylesbury Bucks, United Kingdom	11-50	41 contacts →
	Partial evidence “Sytel Limited develops and supplies Softdial Contact Center (SCC) multimedia, multichannel, fully blended cloud contact center solutions, for quick and easy deployment by partners…” Source: RevenueBase Database · checked Aug 31, 2026
24	SVL	Strong evidence	East Kilbride, United Kingdom	11-50	35 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 Aug 31, 2026
25	Telogo Communications LTD	Indirect evidence	London, United Kingdom	51-200	35 contacts →
	Indirect evidence “At Telogo, we are redefining the way the world connects.” Source: RevenueBase Database · checked Aug 31, 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: cloud communication 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 cloud communication software companies.
Partial evidence: Its own public description names part of cloud communication software companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name cloud communication 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 234 cloud communication software companies based in the United Kingdom

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Cloud communication software companies based in the United Kingdom at a glance

As of Aug 31, 2026

36.9%Verified-email coverage

12.6%Mobile-number coverage

24.7Average contacts per company

11-50Median size (employees)

28.6%Largest-city concentration · London

Aug 31, 2026Page data refreshed

Companies by employee count

1-10

105

11-50

51-200

201-500

501-1,000

1,001-5,000

10001+

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 cloud communication 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 “cloud communication 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 cloud communication 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 cloud communication 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, 2,128 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 August 31, 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.

Cloud communication software companies by metro

Cloud communication software companies in London67

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 cloud communication 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 cloud communication software companies are there based in the United Kingdom?

RevenueBase identified 234 cloud communication software companies headquartered in the United Kingdom as of August 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?

Shoretel, headquartered in White Waltham Maidenhead, tops this list with the largest team on record.

Which city has the most cloud communication software companies?

London leads with 67 headquartered companies, followed by Manchester (7) and Bournemouth (5).

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 2,128 verified decision-maker contacts tracked across these 234 companies.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on August 31, 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.