Company lists · Data refreshed September 2026

Top 25 Ip telephony software companies based in the United Kingdom

Name: Ip telephony 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 28, 2026 89 companies tracked

RevenueBase identified 89 ip telephony software companies headquartered in the United Kingdom as of September 2026 and tracks 806 professional contacts across them, including 286 with verified work emails. London is the largest hub.

This list covers ip telephony 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 28, 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 28, 2026 86% judged on-target in blind review

89Companies

806Contacts tracked

286Verified emails

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The 25 largest ip telephony software companies based in the United Kingdom

Ranked by team size

Top 25 of 89 ip telephony software companies based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 28, 2026. RevenueBase Smart Search rates how each company's information relates to ip telephony 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	HIHI	Indirect evidence	Christchurch, United KingdomHQ checked Sep 28, 2026	11-50	112 contacts →
	Indirect evidence “HiHi is a leading video-enabled business phone.” Source: RevenueBase Database · checked Sep 28, 2026
2	Bicom Systems	Partial evidence	London, United KingdomHQ checked Sep 28, 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 28, 2026
3	Gradwell	Indirect evidence	Bath, United KingdomHQ checked Sep 28, 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 28, 2026
4	Telappliant	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	67 contacts →
	Indirect evidence “Telappliant is an award-winning VoIP and cloud communications provider.” Source: RevenueBase Database · checked Sep 28, 2026
5	Nebula	Partial evidence	Guildford, United KingdomHQ checked Sep 28, 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 28, 2026
6	Voipswitch INC	Partial evidence	London, United KingdomHQ checked Sep 28, 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 28, 2026
7	Voipfone	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	19 contacts →
	Partial evidence “Voipfone is an Internet Telephone Service provided by iNet Telecoms Ltd.” Source: RevenueBase Database · checked Sep 28, 2026
8	Elementel LTD	Partial evidence	Romsey, United KingdomHQ checked Sep 28, 2026	11-50	15 contacts →
	Partial evidence “ElemenTel are a leading provider of next generation voice over internet (VoIP) telephony solutions to businesses of all types and sizes.” Source: RevenueBase Database · checked Sep 28, 2026
9	VTSL	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	15 contacts →
	Indirect evidence “VTSL Ltd is a leading cloud communications company in the UK & Ireland.” Source: RevenueBase Database · checked Sep 28, 2026
10	Millgate Connect	Indirect evidence	Sheffield, United KingdomHQ checked Sep 28, 2026	11-50	14 contacts →
	Indirect evidence “At Millgate Connect, we help organisations simplify communications and connectivity.” Source: RevenueBase Database · checked Sep 28, 2026
11	The Voip Shop	Partial evidence	Leicester, United KingdomHQ checked Sep 28, 2026	11-50	13 contacts →
	Partial evidence “CLOUD TELEPHONE SYSTEM The VoIP Shop is a leading provider of business VoIP phone systems, offering reliable and affordable solutions for small and medium-sized enterprises.” Source: RevenueBase Database · checked Sep 28, 2026
12	SCG Wholesale	Partial evidence	Dummer, United KingdomHQ checked Sep 28, 2026	11-50	12 contacts →
	Partial evidence “SCG Wholesale is at the cutting edge of internet telephony developing and delivering super reliable technologies, applications and features, including Altos, our flagship white…” Source: RevenueBase Database · checked Sep 28, 2026
13	Ihub UK	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	12 contacts →
	Indirect evidence “Winning and keeping customers is a challenge for every business.” Source: RevenueBase Database · checked Sep 28, 2026
14	Icom Voice LTD	Indirect evidence	Birmingham, United KingdomHQ checked Sep 28, 2026	11-50	11 contacts →
	Indirect evidence “ICOM VOICE is one of the most promising Telecommunication Service Providers based in the UK.” Source: RevenueBase Database · checked Sep 28, 2026
15	Cleartech Communications LTD	Partial evidence	Bolton, United KingdomHQ checked Sep 28, 2026	11-50	10 contacts →
	Partial evidence “At ClearTech Communications, we specialise in providing market-leading hardware, advanced systems, and intuitive software to build a robust and resilient communication…” Source: RevenueBase Database · checked Sep 28, 2026
16	Voxbit	Indirect evidence	Belfast, United KingdomHQ checked Sep 28, 2026	11-50	8 contacts →
	Indirect evidence “Voxbit is reinventing the business phone by merging the worlds of cloud computing, web services & telecommunications to make collaborating part of the team.” Source: RevenueBase Database · checked Sep 28, 2026
17	Voipon	Partial evidence	Chelmsford, United KingdomHQ checked Sep 28, 2026	11-50	7 contacts →
	Partial evidence “VoIPon is a worldwide business to business distributor of the highest quality voice over IP hardware.” Source: RevenueBase Database · checked Sep 28, 2026
18	ZIAAS	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	6 contacts →
	Indirect evidence “At ZiAAS, we're passionate about harnessing the power of technology to transform businesses and streamline operations.” Source: RevenueBase Database · checked Sep 28, 2026
19	Via, Part Of The Wavenet Group	Partial evidence	Nottingham, United KingdomHQ checked Sep 28, 2026	51-200	6 contacts →
	Partial evidence “Founded in Wavenet has grown from simple beginnings to become one of the UK’s market leaders in unified communications and business telephony solutions.” Source: RevenueBase Database · checked Sep 28, 2026
20	bitcall.io	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	6 contacts →
	Indirect evidence “BitCall is a leading provider of VoIP services, specializing in delivering top-notch communication solutions to businesses and individuals.” Source: RevenueBase Database · checked Sep 28, 2026
21	Telespeak	Partial evidence	Long Crendon, United KingdomHQ checked Sep 28, 2026	1-10	6 contacts →
	Partial evidence “Headquartered near Oxford in the UK, TeleSpeak specialises in training, consultancy, support and selected product distribution for Asterisk, VoIP, SIP and telephony generally.” Source: RevenueBase Database · checked Sep 28, 2026
22	Voicelinx LTD	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	1-10	4 contacts →
	Indirect evidence “Voicelinx are experts in VOIP telecoms.” Source: RevenueBase Database · checked Sep 28, 2026
23	ICC Networks	Strong evidence	Leeds, United KingdomHQ checked Sep 28, 2026	11-50	4 contacts →
	Strong evidence “UK based ICC Networks provides outstanding telco Software as a Service for Internet Telephone Service providers throughout Europe and beyond.” Source: RevenueBase Database · checked Sep 28, 2026
24	yay.com	Indirect evidence	Guildford, United KingdomHQ checked Sep 28, 2026	11-50	4 contacts →
	Indirect evidence “Yay.com™ was started to take away the headaches of starting up or expanding your business communications.” Source: RevenueBase Database · checked Sep 28, 2026
25	Hybrid Comms	Partial evidence	Brighton And Hove, United KingdomHQ checked Sep 28, 2026	1-10	3 contacts →
	Partial evidence “Specialists in Business VoIP Telephony and Unified Comms Solutions for the modern hybrid workforce” Source: RevenueBase Database · checked Sep 28, 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: ip telephony 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 ip telephony software companies.
Partial evidence: Its own public description names part of ip telephony software companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name ip telephony 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 89 ip telephony software companies based in the United Kingdom

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Ip telephony software companies based in the United Kingdom at a glance

As of Sep 28, 2026

35.5%Verified-email coverage

9.1Average contacts per company

11-50Median size (employees)

32.6%Largest-city concentration · London

Sep 28, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

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 89 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 ip telephony 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 “ip telephony 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 ip telephony 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 ip telephony 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, 286 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 28, 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.

Ip telephony software companies by metro

Ip telephony software companies in London29

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 ip telephony 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 ip telephony software companies are there based in the United Kingdom?

RevenueBase identified 89 ip telephony 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?

HIHI, headquartered in Christchurch, tops this list with the largest team on record.

Which city has the most ip telephony software companies?

London leads with 29 headquartered companies, followed by Birmingham (3) and Manchester (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 286 verified decision-maker contacts tracked across these 89 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 28, 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.