Company lists · Data refreshed September 2026

Top 25 Voice over internet protocol providers based in the United Kingdom

Name: Voice over internet protocol providers 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 401 companies tracked

RevenueBase identified 401 voice over internet protocol providers headquartered in the United Kingdom as of September 2026 and tracks 3,232 professional contacts across them, including 875 with verified work emails. London is the largest hub.

This list covers voice over internet protocol providers 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

401Companies

3,232Contacts tracked

875Verified emails

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The 25 largest voice over internet protocol providers based in the United Kingdom

Ranked by team size

Top 25 of 401 voice over internet protocol providers 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 voice over internet protocol providers: 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	Bonline	Indirect evidence	London, United KingdomHQ checked Sep 22, 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 22, 2026
2	YO Telecom	Indirect evidence	Southampton, United KingdomHQ checked Sep 22, 2026	51-200	97 contacts →
	Indirect evidence “Yo Telecom is an award winning telecommunications provider that specialises in small to medium sized businesses.” Source: RevenueBase Database · checked Sep 22, 2026
3	Wavecrest	Partial evidence	London, United KingdomHQ checked Sep 22, 2026	51-200	93 contacts →
	Partial evidence “Wavecrest is a global managed voice and messaging services company.” Source: RevenueBase Database · checked Sep 22, 2026
4	Bicom Systems	Indirect evidence	London, United KingdomHQ checked Sep 22, 2026	51-200	90 contacts →
	Indirect 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 22, 2026
5	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
6	Gradwell	Indirect evidence	Bath, United KingdomHQ checked Sep 22, 2026	51-200	85 contacts →
	Indirect 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
7	Speedflow	Indirect evidence	London, United KingdomHQ checked Sep 22, 2026	51-200	79 contacts →
	Indirect evidence “With a broad experience in the industry, Speedflow is in the best position to provide you with products and services proven by time to be effective.” Source: RevenueBase Database · checked Sep 22, 2026
8	Telappliant	Indirect evidence	London, United KingdomHQ checked Sep 22, 2026	51-200	67 contacts →
	Indirect evidence “Telappliant is an award-winning VoIP and cloud communications provider.” Source: RevenueBase Database · checked Sep 22, 2026
9	Firstcom Europe LTD	Partial evidence	Bolton, United KingdomHQ checked Sep 22, 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 22, 2026
10	Cellular Solutions	Indirect evidence	Sunderland, United KingdomHQ checked Sep 22, 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 22, 2026
11	Microtalk	Strong evidence	London, United KingdomHQ checked Sep 22, 2026	11-50	45 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 Sep 22, 2026
12	XINIX	Indirect evidence	London, United KingdomHQ checked Sep 22, 2026	11-50	43 contacts →
	Indirect 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
13	Voicetec SYS LTD	Partial evidence	Hayes, United KingdomHQ checked Sep 22, 2026	11-50	34 contacts →
	Partial evidence “Voicetec provides a range of telecommunication solutions and services in the areas wholesale of International minutes as well as of origination and termination of calls for…” Source: RevenueBase Database · checked Sep 22, 2026
14	Lister Unified Communications	Indirect evidence	Stonehouse, United KingdomHQ checked Sep 22, 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 22, 2026
15	Comms Connect	Indirect evidence	Hertfordshire, United KingdomHQ checked Sep 22, 2026	11-50	29 contacts →
	Indirect evidence “Comms Connect is an award-winning UK provider of business communications, connectivity and energy solutions, helping organisations stay connected, productive and competitive.” Source: RevenueBase Database · checked Sep 22, 2026
16	Universal Call Limited UCL	Partial evidence	London, United KingdomHQ checked Sep 22, 2026	51-200	28 contacts →
	Partial evidence “Our Company: Universal Call is a UK based leading wholesale service provider and is now fast expanding into the global wholesale voice market, leveraging on our accumulated…” Source: RevenueBase Database · checked Sep 22, 2026
17	Mainstream Digital	Partial evidence	Cirencester, United KingdomHQ checked Sep 22, 2026	11-50	24 contacts →
	Partial 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 22, 2026
18	Pinevox	Indirect evidence	Harrow, United KingdomHQ checked Sep 22, 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 22, 2026
19	Magrathea Telecommunications LTD	Partial evidence	Theale, United KingdomHQ checked Sep 22, 2026	11-50	23 contacts →
	Partial evidence “Magrathea have been wholesale VoIP experts for over 25 years.” Source: RevenueBase Database · checked Sep 22, 2026
20	Alliance Communications	Indirect evidence	Ham Green, United KingdomHQ checked Sep 22, 2026	1-10	23 contacts →
	Indirect evidence “Alliance Communications provides businesses with clear impartial advice on a range of communications needs.” Source: RevenueBase Database · checked Sep 22, 2026
21	SCG Solutions	Partial evidence	Aberdeen, United KingdomHQ checked Sep 22, 2026	201-500	20 contacts →
	Partial evidence “2 Circles Solutions have partnered with SCG Communications, NSN & Hello Telecom, creating 'SCG Solutions' creating a supercharged service provider with over 50 years of combined…” Source: RevenueBase Database · checked Sep 22, 2026
22	Wavetel Business LTD	Indirect evidence	Basildon, United KingdomHQ checked Sep 22, 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 22, 2026
23	Birmingham Telecommunications Limited	Indirect evidence	Coleshill, United KingdomHQ checked Sep 22, 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 22, 2026
24	9eons Limited	Partial evidence	Milton Keynes, United KingdomHQ checked Sep 22, 2026	11-50	19 contacts →
	Partial evidence “9Eons provides a comprehensive suite of voice and data services to a wide variety of customers: from Mobile operators to residential users.” Source: RevenueBase Database · checked Sep 22, 2026
25	Voipfone	Partial evidence	London, United KingdomHQ checked Sep 22, 2026	11-50	19 contacts →
	Partial evidence “Voipfone is an Internet Telephone Service provided by iNet Telecoms Ltd.” 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: voice over internet protocol providers. 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 voice over internet protocol providers.
Partial evidence: Its own public description names part of voice over internet protocol providers, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name voice over internet protocol providers. 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 401 voice over internet protocol providers based in the United Kingdom

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Voice over internet protocol providers based in the United Kingdom at a glance

As of Sep 22, 2026

27.1%Verified-email coverage

8.1Average contacts per company

11-50Median size (employees)

28.2%Largest-city concentration · London

Sep 22, 2026Page data refreshed

Companies by employee count

1-10

196

11-50

165

51-200

201-500

501-1,000

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 401 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 voice over internet protocol providers, 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 “voice over internet protocol providers”. 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 voice over internet protocol providers), 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 voice over internet protocol providers, 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, 875 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.

Voice over internet protocol providers by metro

Voice over internet protocol providers in London113

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 voice over internet protocol providers, 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 voice over internet protocol providers are there based in the United Kingdom?

RevenueBase identified 401 voice over internet protocol providers 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?

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

Which city has the most voice over internet protocol providers?

London leads with 113 headquartered companies, followed by Manchester (11) and Birmingham (9).

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 875 verified decision-maker contacts tracked across these 401 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.