Company lists · Data refreshed September 2026

Top 25 Calling companies based in Germany

Name: Calling companies based in Germany
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 21, 2026 228 companies tracked

RevenueBase identified 228 calling companies headquartered in Germany as of September 2026 and tracks 2,253 professional contacts across them, including 914 with verified work emails. Berlin is the largest hub.

This list covers calling companies headquartered in Germany, 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 21, 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 21, 2026 86% judged on-target in blind review

228Companies

2,253Contacts tracked

914Verified emails

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The 25 largest calling companies based in Germany

Ranked by team size

Top 25 of 228 calling companies based in Germany, ranked by team size, largest first. Data refreshed Sep 21, 2026. RevenueBase Smart Search rates how each company's information relates to calling 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	Plusnet Gmbh	Indirect evidence	Köln, GermanyHQ checked Sep 21, 2026	201-500	248 contacts →
	Indirect evidence “Die Plusnet GmbH, eine Tochtergesellschaft der EnBW, ist ein deutsches Telekommunikationsunternehmen mit Fokus auf Geschäftskunden.” Source: RevenueBase Database · checked Sep 21, 2026
2	Sipgate	Indirect evidence	Düsseldorf, GermanyHQ checked Sep 21, 2026	201-500	201 contacts →
	Indirect evidence “Founded in 2004, we at sipgate were the first German VoIP provider and have been developing internet and telephony services ever since.” Source: RevenueBase Database · checked Sep 21, 2026
3	Innovaphone	Indirect evidence	Sindelfingen, GermanyHQ checked Sep 21, 2026	51-200	96 contacts →
	Indirect evidence “innovaphone has been playing a decisive role in driving the development of IP telephony and digital transformation for more than 25 years now and is a leading European provider of…” Source: RevenueBase Database · checked Sep 21, 2026
4	Enreach DE	Indirect evidence	Bochum, GermanyHQ checked Sep 21, 2026	1,001-5,000	75 contacts →
	Indirect evidence “Enreach ist ein europaweit führender Anbieter von Unified-Communications- und Cloud-Contact-Center-Lösungen.” Source: RevenueBase Database · checked Sep 21, 2026
5	Gamma DE	Indirect evidence	Oberkotzau, GermanyHQ checked Sep 21, 2026	51-200	67 contacts →
	Indirect evidence “Die HFO Telecom GmbH verbindet modernste Technologien im Telekommunikationsbereich mit langjähriger Erfahrung.” Source: RevenueBase Database · checked Sep 21, 2026
6	Placetel	Indirect evidence	Köln, GermanyHQ checked Sep 21, 2026	51-200	55 contacts →
	Indirect evidence “Placetel ist in Deutschland einer der führenden Anbieter von professionellen Telefonanlagen aus der Cloud und ein Dienst der Gamma Placetel GmbH.” Source: RevenueBase Database · checked Sep 21, 2026
7	Byon Gmbh	Indirect evidence	Frankfurt Am Main, GermanyHQ checked Sep 21, 2026	51-200	45 contacts →
	Indirect evidence “IT Managed Services und Cloud Telefonie 2006 wurde die byon gmbh mit Sitz in Frankfurt/Main gegründet.” Source: RevenueBase Database · checked Sep 21, 2026
8	SH Business COM Gmbh	Indirect evidence	Herbolzheim, GermanyHQ checked Sep 21, 2026	51-200	36 contacts →
	Indirect evidence “SH business COM, zählt seit über 30 Jahren zu den größten und leistungsstärksten Kommunikationszentren in Deutschland.” Source: RevenueBase Database · checked Sep 21, 2026
9	Kevag Telekom Gmbh	Indirect evidence	Koblenz, GermanyHQ checked Sep 21, 2026	51-200	34 contacts →
	Indirect evidence “Für Unternehmen, Institutionen und öffentliche Verwaltung Die KEVAG Telekom (KTK) ist seit 1997 Ihr zuverlässiger Partner für professionelle Telekommunikationslösungen.” Source: RevenueBase Database · checked Sep 21, 2026
10	Ebuero AG	Indirect evidence	Berlin, GermanyHQ checked Sep 21, 2026	201-500	33 contacts →
	Indirect evidence “Das Büro der Zukunft.” Source: RevenueBase Database · checked Sep 21, 2026
11	Apelby	Indirect evidence	Düsseldorf, GermanyHQ checked Sep 21, 2026	51-200	32 contacts →
	Indirect evidence “We are global telecommunications provider of international voice, data, messaging and outsourcing services.” Source: RevenueBase Database · checked Sep 21, 2026
12	42com Telecommunication Gmbh	Indirect evidence	Berlin, GermanyHQ checked Sep 21, 2026	11-50	31 contacts →
	Indirect evidence “Established in 2002, 42com Telecommunication GmbH started by designing a white-label VoIP platform.” Source: RevenueBase Database · checked Sep 21, 2026
13	S-Kon Sales Kontor Hamburg AG	Indirect evidence	Hamburg, GermanyHQ checked Sep 21, 2026	51-200	28 contacts →
	Indirect evidence “S-KON Sales Kontor Hamburg AG is a telecommunications company based out of Germany.” Source: RevenueBase Database · checked Sep 21, 2026
14	Syno Consulting Group AG	Indirect evidence	Hamburg, GermanyHQ checked Sep 21, 2026	51-200	26 contacts →
	Indirect evidence “SYNO steht für Synergien.” Source: RevenueBase Database · checked Sep 21, 2026
15	Tele Thorwarth Gmbh	Indirect evidence	Schmalkalden, GermanyHQ checked Sep 21, 2026	51-200	25 contacts →
	Indirect evidence “Die TELE THORWARTH GmbH realisiert für Geschäftskunden aller Branchen professionelle und innovative Lösungen in der Telekommunikation mit den Schwerpunkten Mobil- und Festnetze…” Source: RevenueBase Database · checked Sep 21, 2026
16	Toplink Gmbh	Indirect evidence	Darmstadt, GermanyHQ checked Sep 21, 2026	11-50	24 contacts →
	Indirect evidence “Cloud- und On-Premise-Lösungen - Technologie verwandelt Die toplink-Gruppe etwas genauer betrachtet: toplink GmbH - die Cloud Company Bereits 2005 vermarktet die toplink GmbH die…” Source: RevenueBase Database · checked Sep 21, 2026
17	Firstcom Europe	Indirect evidence	Goldbach, GermanyHQ checked Sep 21, 2026	51-200	21 contacts →
	Indirect evidence “We offer advantages of modern telephone systems and cloud solutions as well as access to landline network and internet, all from one source.” Source: RevenueBase Database · checked Sep 21, 2026
18	OFF Telekommunikation Gmbh	Indirect evidence	Börwang, GermanyHQ checked Sep 21, 2026	51-200	21 contacts →
	Indirect evidence “Die OFF Telekommunikation GmbH ist DER Partner für moderne Kommunikationslösungen.” Source: RevenueBase Database · checked Sep 21, 2026
19	Good Connected Gmbh & Co. KG	Indirect evidence	Herrsching Am Ammersee, GermanyHQ checked Sep 21, 2026	11-50	20 contacts →
	Indirect evidence “Wir sind speziell ausgebildete Dienstleister und Berater für Business-Telekommunikation.” Source: RevenueBase Database · checked Sep 21, 2026
20	Sit-Solutions	Indirect evidence	Adelsdorf, GermanyHQ checked Sep 21, 2026	11-50	19 contacts →
	Indirect evidence “Your experts in information technology.” Source: RevenueBase Database · checked Sep 21, 2026
21	Netcom Kassel Gesellschaft FÜR Telekommunikation MBH	Indirect evidence	Kassel, GermanyHQ checked Sep 21, 2026	51-200	18 contacts →
	Indirect evidence “Seit der Gründung im Jahr 1997 hat sich die Netcom Kassel zu einem der wichtigsten Telekommunikationsunternehmen in Hessen entwickelt.” Source: RevenueBase Database · checked Sep 21, 2026
22	Bunsieck & Partner Gmbh	Indirect evidence	Greven, GermanyHQ checked Sep 21, 2026	11-50	16 contacts →
	Indirect evidence “Wir verbinden Informationstechnologie und Telekommunikation Seit 1987 stehen wir als zuverlässiger Partner an der Seite unserer Kunden.” Source: RevenueBase Database · checked Sep 21, 2026
23	Schollmeier Telekommunikation	Indirect evidence	Mannheim, GermanyHQ checked Sep 21, 2026	11-50	16 contacts →
	Indirect evidence “Schollmeier - Dein 360° Telekommunikationsanbieter.” Source: RevenueBase Database · checked Sep 21, 2026
24	Engy Solutions	Indirect evidence	Dortmund, GermanyHQ checked Sep 21, 2026	11-50	15 contacts →
	Indirect evidence “eNgY SOLUTIONS is revolutionizing business communication.” Source: RevenueBase Database · checked Sep 21, 2026
25	Phonekom Business Communications AG	Indirect evidence	Friedrichsdorf, GermanyHQ checked Sep 21, 2026	11-50	15 contacts →
	Indirect evidence “WIR VERBINDEN BUSINESS TEAMS!” Source: RevenueBase Database · checked Sep 21, 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: calling 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 calling companies.
Partial evidence: Its own public description names part of calling companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name calling 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 228 calling companies based in Germany

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Calling companies based in Germany at a glance

As of Sep 21, 2026

40.6%Verified-email coverage

9.9Average contacts per company

11-50Median size (employees)

8.3%Largest-city concentration · Berlin

Sep 21, 2026Page data refreshed

Companies by employee count

1-10

110

11-50

51-200

201-500

501-1,000

1,001-5,000

5,001-10,000

Email recency for this list is measured worldwide rather than for Germany, so it is reported there. Company counts and contact totals on this page are exact for Germany, over 228 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 calling 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 Germany whose own description of what they do matches “calling 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 calling 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 calling companies, and records with no verified work email. Companies headquartered outside Germany 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, 914 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 21, 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.

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 calling 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 calling companies are there based in Germany?

RevenueBase identified 228 calling companies headquartered in Germany 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?

Plusnet Gmbh, headquartered in Koln, tops this list with the largest team on record.

Which city has the most calling companies?

Berlin leads with 19 headquartered companies, followed by Hamburg (7) and Munchen (6).

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 914 verified decision-maker contacts tracked across these 228 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 21, 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.