Company lists · Data refreshed September 2026

Top 25 Cloud pbx platforms software companies based in the United Kingdom

Name: Cloud pbx platforms 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 Sep 14, 2026 286 companies tracked

RevenueBase identified 286 cloud pbx platforms software companies headquartered in the United Kingdom as of September 2026 and tracks 3,745 professional contacts across them, including 1,319 with verified work emails. London is the largest hub.

This list covers cloud pbx platforms 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 14, 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 14, 2026 86% judged on-target in blind review

286Companies

3,745Contacts tracked

1,319Verified emails

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The 25 largest cloud pbx platforms software companies based in the United Kingdom

Ranked by team size

Top 25 of 286 cloud pbx platforms software companies based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 14, 2026. RevenueBase Smart Search rates how each company's information relates to cloud pbx platforms 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	Onecom	Partial evidence	Fareham, United KingdomHQ checked Sep 14, 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 14, 2026
2	Imimobile Part Of Webex	Indirect evidence	London, United KingdomHQ checked Sep 14, 2026	1,001-5,000	433 contacts →
	Indirect evidence “We've moved!” Source: RevenueBase Database · checked Sep 14, 2026
3	Bonline	Indirect evidence	London, United KingdomHQ checked Sep 14, 2026	51-200	170 contacts →
	Indirect evidence “bOnline is UK’s leading provider of VoIP services for micro and small businesses.” Source: RevenueBase Database · checked Sep 14, 2026
4	Metaswitch Networks	Strong evidence	Enfield, United KingdomHQ checked Sep 14, 2026	501-1,000	91 contacts →
	Strong evidence “Metaswitch is a recognized leader in the development of ultra-high-performance, cloud native communications software.” Source: RevenueBase Database · checked Sep 14, 2026
5	Bicom Systems	Partial evidence	London, United KingdomHQ checked Sep 14, 2026	51-200	90 contacts →
	Partial evidence “Made for businesses of all sizes, Bicom Systems revolutionizes communications by providing PBXware, the world's most unified turnkey open standards hosted telephony platform, plus…” Source: RevenueBase Database · checked Sep 14, 2026
6	Sipcom	Indirect evidence	London, United KingdomHQ checked Sep 14, 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 14, 2026
7	Gradwell	Partial evidence	Bath, United KingdomHQ checked Sep 14, 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 14, 2026
8	Telappliant	Partial evidence	London, United KingdomHQ checked Sep 14, 2026	51-200	67 contacts →
	Partial evidence “Telappliant is an award-winning VoIP and cloud communications provider.” Source: RevenueBase Database · checked Sep 14, 2026
9	Nebula	Partial evidence	Guildford, United KingdomHQ checked Sep 14, 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 14, 2026
10	Digitalk	Partial evidence	Milton Keynes, United KingdomHQ checked Sep 14, 2026	51-200	60 contacts →
	Partial 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 Sep 14, 2026
11	Firstcom Europe LTD	Partial evidence	Bolton, United KingdomHQ checked Sep 14, 2026	51-200	56 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 Sep 14, 2026
12	Cellular Solutions	Indirect evidence	Sunderland, United KingdomHQ checked Sep 14, 2026	n/a	56 contacts →
	Indirect 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 14, 2026
13	Microtalk	Partial evidence	London, United KingdomHQ checked Sep 14, 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 14, 2026
14	XINIX	Partial evidence	London, United KingdomHQ checked Sep 14, 2026	11-50	43 contacts →
	Partial evidence “Xinix is UK’s leading cloud-based unified communication provider making persistent efforts towards modernizing business communications.” Source: RevenueBase Database · checked Sep 14, 2026
15	Sytel LTD	Partial evidence	Aylesbury, United KingdomHQ checked Sep 14, 2026	11-50	42 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 Sep 14, 2026
16	SVL	Partial evidence	East Kilbride, United KingdomHQ checked Sep 14, 2026	11-50	36 contacts →
	Partial 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 14, 2026
17	Lister Unified Communications	Indirect evidence	Stonehouse, United KingdomHQ checked Sep 14, 2026	11-50	32 contacts →
	Indirect evidence “At Lister Unified Communications we understand that everyone’s business telephone requirements are different.” Source: RevenueBase Database · checked Sep 14, 2026
18	Quickblox	Strong evidence	London, United KingdomHQ checked Sep 14, 2026	11-50	31 contacts →
	Strong evidence “QuickBlox is a leading cloud communication platform helping businesses bring AI-driven chat, video, and automation into their digital products-quickly, securely, and at scale.” Source: RevenueBase Database · checked Sep 14, 2026
19	Mission Labs	Indirect evidence	Rossendale, United KingdomHQ checked Sep 14, 2026	51-200	27 contacts →
	Indirect evidence “At Mission Labs we have a single vision: to power the future of business communications.” Source: RevenueBase Database · checked Sep 14, 2026
20	Devyce	Indirect evidence	London, United KingdomHQ checked Sep 14, 2026	11-50	26 contacts →
	Indirect evidence “We’re creating a secure, collaborative new phone system.” Source: RevenueBase Database · checked Sep 14, 2026
21	Voipswitch INC	Partial evidence	London, United KingdomHQ checked Sep 14, 2026	1-10	26 contacts →
	Partial evidence “For over two decades, we have been delivering proprietary, carrier-grade software that enables operators to launch, manage and scale secure, reliable VoIP services.” Source: RevenueBase Database · checked Sep 14, 2026
22	Mainstream Digital	Indirect evidence	Cirencester, United KingdomHQ checked Sep 14, 2026	11-50	24 contacts →
	Indirect evidence “Mainstream Digital – Communications Solutions for Business Mainstream Digital is a Business Communications solutions provider with over 20 years of telecommunications experience.” Source: RevenueBase Database · checked Sep 14, 2026
23	Pinevox	Indirect evidence	Harrow, United KingdomHQ checked Sep 14, 2026	11-50	24 contacts →
	Indirect evidence “With a legacy rooted in two decades of telecom consulting and services expertise, PineVox emerges as a visionary leader in the industry.” Source: RevenueBase Database · checked Sep 14, 2026
24	Wavetel Business LTD	Indirect evidence	Basildon, United KingdomHQ checked Sep 14, 2026	51-200	20 contacts →
	Indirect evidence “Wavetel is one of the top VoIP Phone System and Telecom Services Providers in the UK.” Source: RevenueBase Database · checked Sep 14, 2026
25	Birmingham Telecommunications Limited	Indirect evidence	Coleshill, United KingdomHQ checked Sep 14, 2026	11-50	19 contacts →
	Indirect evidence “Since 2006, Birmingham Telecom has been helping businesses across the UK with reliable business telecoms, Managed IT Support, Cyber Security and Connectivity Solutions.” Source: RevenueBase Database · checked Sep 14, 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 pbx platforms 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 pbx platforms software companies.
Partial evidence: Its own public description names part of cloud pbx platforms 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 pbx platforms 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 286 cloud pbx platforms software companies based in the United Kingdom

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Cloud pbx platforms software companies based in the United Kingdom at a glance

As of Sep 14, 2026

35.2%Verified-email coverage

13.1Average contacts per company

11-50Median size (employees)

24.1%Largest-city concentration · London

Sep 14, 2026Page data refreshed

Companies by employee count

1-10

139

11-50

106

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 286 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 cloud pbx platforms 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 pbx platforms 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 pbx platforms 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 pbx platforms 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, 1,319 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 14, 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 pbx platforms software companies by metro

Cloud pbx platforms software companies in London69

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 pbx platforms 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 pbx platforms software companies are there based in the United Kingdom?

RevenueBase identified 286 cloud pbx platforms 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?

Onecom, headquartered in Whiteley, tops this list with the largest team on record.

Which city has the most cloud pbx platforms software companies?

London leads with 69 headquartered companies, followed by Manchester (11) 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 1,319 verified decision-maker contacts tracked across these 286 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 14, 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.