Company lists · Data verified August 2026

Top 25 Enterprise voice solutions companies based in the United Kingdom

Name: Enterprise voice solutions companies based in the United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Verified Aug 28, 2026 720 companies tracked

There are 720 enterprise voice solutions companies headquartered in the United Kingdom (RevenueBase, August 2026). RevenueBase tracks 11,403 professional contacts across them, including 4,063 with verified work emails and 827 with mobile numbers. London is the largest hub.

This list covers enterprise voice solutions 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. Data current as of August 28, 2026.

720Companies

11,403Contacts tracked

4,063Verified emails

827Mobile numbers

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The 25 largest enterprise voice solutions companies based in the United Kingdom

Ranked by team size

Top 25 of 720 enterprise voice solutions companies based in the United Kingdom, ranked by team size, largest first. Data verified Aug 28, 2026. Click a count to unlock that company's people.
#	Company	HQ	Employees	Contacts	Verified emails
1	GAMMA	Washington	1,001-5,000	1,576	672
2	Exponential-E	London	501-1,000	661	505
3	Onecom	Whiteley	501-1,000	650	437
4	Calltower	London	201-500	226	128
5	Hiya INC	London	51-200	201	96
6	Bonline	London	51-200	172	41
7	Elite Group	Chorley	51-200	151	35
8	Loopup	London	201-500	122	74
9	NTT Ltd. Collaboration & CX	London	10001+	120	15
10	FLR Spectron LTD	Orpington	51-200	111	72
11	Tela Technology	Worcester	51-200	109	76
12	YO Telecom	Southampton	51-200	97	39
13	Gradwell	West Bath	51-200	85	43
14	Sipcom	London	501-1,000	84	28
15	Rydal Group	Peterborough	51-200	73	14
16	Welcomm Communications	Market Harborough	51-200	68	42
17	Telappliant	Manchester	51-200	67	44
18	Britannic	Guildford	51-200	65	35
19	Abzorb	Brighouse	51-200	61	22
20	Enconvo UK	Telford	51-200	61	15
21	Nebula	Guildford	51-200	60	29
22	Firstcom Europe LTD	Bolton	51-200	55	40
23	Prestige Telecom Group	Gosport	51-200	44	17
24	Simplicity Group	Belfast	51-200	43	32
25	Mtech Communications Limited	Christchurch	51-200	33	20

Showing 25 of 720 enterprise voice solutions companies based in the United Kingdom

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Enterprise voice solutions companies based in the United Kingdom at a glance

As of Aug 28, 2026

11-50Median size (employees)

LondonLargest hub · 133 HQs

827Contacts with mobile numbers

0Emails re-verified in last 30 days

Companies by employee count

1-10

323

11-50

307

51-200

201-500

501-1,000

1,001-5,000

10001+

Enterprise voice solutions companies by metro

Metro	Companies
Enterprise voice solutions companies in London	133
Enterprise voice solutions companies in Manchester	15
Enterprise voice solutions companies in Birmingham	14
Enterprise voice solutions companies in Leeds	11
Enterprise voice solutions companies in Glasgow	10
Enterprise voice solutions companies in Bristol	8
Enterprise voice solutions companies in Bolton	7

How this list was built

Source: The RevenueBase company graph: 21.3 million companies and 398.9 million professional contacts resolved from primary sources.
Inclusion: Companies whose own business descriptions match “enterprise voice solutions companies”, with match quality audited by blind human judging, and headquartered in the United Kingdom.
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: Contact records re-verify on a rolling cadence; 0 contacts on this list were re-verified in the last 30 days.
Refresh: Lists are refreshed periodically as the underlying company graph is re-verified. Last verified Aug 28, 2026.

Frequently asked

How many enterprise voice solutions companies are there based in the United Kingdom?

There are 720 enterprise voice solutions companies headquartered in the United Kingdom as of August 2026 (RevenueBase).

What is the largest company on this list?

GAMMA, headquartered in Washington, tops this list with the largest team on record.

Which city has the most enterprise voice solutions companies?

London leads with 133 headquartered companies, followed by Manchester (15) and Birmingham (14).

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 4,063 verified decision-maker contacts tracked across these 720 companies.

How current is this list?

The list is refreshed periodically as the underlying company graph is re-verified. It was last verified on August 28, 2026.

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About this data

RevenueBase is a B2B contact data platform. Its company graph covers 21.3 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, the same data that powers RevenueBase's B2B data products and the free research portal.