Company lists · Data refreshed September 2026

Top 25 Enterprise voice consultants based in Germany

Name: Enterprise voice consultants based in Germany
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 28, 2026 100 companies tracked

RevenueBase identified 100 enterprise voice consultants headquartered in Germany as of September 2026 and tracks 763 professional contacts across them, including 347 with verified work emails. Berlin is the largest hub.

This list covers enterprise voice consultants 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 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

100Companies

763Contacts tracked

347Verified emails

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The 25 largest enterprise voice consultants based in Germany

Ranked by team size

Top 25 of 100 enterprise voice consultants based in Germany, ranked by team size, largest first. Data refreshed Sep 28, 2026. RevenueBase Smart Search rates how each company's information relates to enterprise voice consultants: 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	Ostertag Detewe	Indirect evidence	Düsseldorf, GermanyHQ checked Sep 28, 2026	201-500	153 contacts →
	Indirect evidence “Transform your business DeTeWe Communications have many years of experience in delivering tailored, integrated solutions for their clients internationally 365 days a year, 24…” Source: RevenueBase Database · checked Sep 28, 2026
2	Innovaphone	Indirect evidence	Sindelfingen, GermanyHQ checked Sep 28, 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 28, 2026
3	Mediasystem	Indirect evidence	Reinbek, GermanyHQ checked Sep 28, 2026	51-200	27 contacts →
	Indirect evidence “Agiles Arbeiten.” Source: RevenueBase Database · checked Sep 28, 2026
4	Syno Consulting Group AG	Indirect evidence	Hamburg, GermanyHQ checked Sep 28, 2026	51-200	26 contacts →
	Indirect evidence “SYNO steht für Synergien.” Source: RevenueBase Database · checked Sep 28, 2026
5	Good Connected Gmbh & Co. KG	Indirect evidence	Herrsching Am Ammersee, GermanyHQ checked Sep 28, 2026	11-50	20 contacts →
	Indirect evidence “Wir sind speziell ausgebildete Dienstleister und Berater für Business-Telekommunikation.” Source: RevenueBase Database · checked Sep 28, 2026
6	Veovia	Indirect evidence	Berlin, GermanyHQ checked Sep 28, 2026	11-50	17 contacts →
	Indirect evidence “veovia creates solutions for people, devices and companies to make modern working in a technologised world simple & functional.” Source: RevenueBase Database · checked Sep 28, 2026
7	Vistafon	Indirect evidence	Munich, GermanyHQ checked Sep 28, 2026	11-50	17 contacts →
	Indirect evidence “Vistafon is a consulting firm and solution provider for videoconferencing, collaboration tools and digital transformation headquartered in Munich.” Source: RevenueBase Database · checked Sep 28, 2026
8	Coeo Systemhaus Gmbh	Indirect evidence	Schwaig Bei Nürnberg, GermanyHQ checked Sep 28, 2026	11-50	15 contacts →
	Indirect evidence “COEO Systemhaus GmbH is an information technology and services company based out of Schwaig, Bavaria, Germany.” Source: RevenueBase Database · checked Sep 28, 2026
9	O-Byte.com Gmbh & Co. KG	Indirect evidence	Münster, GermanyHQ checked Sep 28, 2026	11-50	13 contacts →
	Indirect evidence “o-byte.com ist ein mittelständisches ITK-Systemhaus aus der Fahrradstadt Münster mit Standorten in Köln und Lüdenscheid.” Source: RevenueBase Database · checked Sep 28, 2026
10	Binder Systemhaus Gmbh	Indirect evidence	Balingen, GermanyHQ checked Sep 28, 2026	11-50	12 contacts →
	Indirect evidence “Systemspezialisten für IT- und Telekommunikation mit Fokus auf tiefe Integrationen individueller Geschäftsprozesse und Lösungen.” Source: RevenueBase Database · checked Sep 28, 2026
11	Hecom TK It-Lösungen	Indirect evidence	Ludwigshafen Am Rhein, GermanyHQ checked Sep 28, 2026	11-50	12 contacts →
	Indirect evidence “Telekommunikationslösungen - IT-Dienstleistungen - Hard- und Software - Beratung und Verkauf Wir bieten eine langjährige Erfahrung in den folgenden Bereichen an: IT - Systeme…” Source: RevenueBase Database · checked Sep 28, 2026
12	Itcares Gmbh	Indirect evidence	Stuttgart, GermanyHQ checked Sep 28, 2026	11-50	11 contacts →
	Indirect evidence “Unser Hobby ist unser Beruf.” Source: RevenueBase Database · checked Sep 28, 2026
13	Telenova Gmbh	Indirect evidence	München-unterföhring, GermanyHQ checked Sep 28, 2026	11-50	11 contacts →
	Indirect evidence “Wir verbinden Menschen – ob Local oder Global Player, vom Start-up bis zum Großkonzern.” Source: RevenueBase Database · checked Sep 28, 2026
14	Iant Gmbh	Indirect evidence	Wolfenbüttel, GermanyHQ checked Sep 28, 2026	1-10	11 contacts →
	Indirect evidence “We at IANT are an integrator for VoIP/UC telephone systems, specialized in Open Standards technologies.” Source: RevenueBase Database · checked Sep 28, 2026
15	Komjan Group	Indirect evidence	Nuremberg, GermanyHQ checked Sep 28, 2026	11-50	11 contacts →
	Indirect evidence “Komjan Group is an owner-managed telecommunications and service company based in Nuremberg, Germany.” Source: RevenueBase Database · checked Sep 28, 2026
16	Telefonbau Schneider Gmbh & Co. KG	Indirect evidence	Erkrath-unterfeldhaus, GermanyHQ checked Sep 28, 2026	51-200	10 contacts →
	Indirect evidence “Telefonanlagen, Cloud-Telefonie, ITK, Unify Office by RingCentral, Microsoft Teams, Atos Unify, Estos, Alcatel, Mitos, Innovaphone, Unified Communications, Kollaboration…” Source: RevenueBase Database · checked Sep 28, 2026
17	DEK Telecom Gmbh	Indirect evidence	Osnabrück, GermanyHQ checked Sep 28, 2026	11-50	8 contacts →
	Indirect evidence “Beratung, Planung & Realisierung von ITK Systemen Hard- & Softwarelösungen Installation und Wartung von Telefonanlagen, Software- und UC-Lösungen Seit über 25 Jahren ist die DEK…” Source: RevenueBase Database · checked Sep 28, 2026
18	Comconic Gmbh	Indirect evidence	Stuttgart, GermanyHQ checked Sep 28, 2026	1-10	8 contacts →
	Indirect evidence “Comconic ist seit 1996 im liberalisierten Markt der ITK tätig und verfügt daher als Partner nahezu aller namhaften Anbieter von Sprach- & Datenkommunikation über eine große…” Source: RevenueBase Database · checked Sep 28, 2026
19	I CAN Gmbh	Indirect evidence	Würzburg, GermanyHQ checked Sep 28, 2026	11-50	8 contacts →
	Indirect evidence “IT-Systemhaus mit Herz - Netzwerk - IT - Kommunikation - Alarm - Video.” Source: RevenueBase Database · checked Sep 28, 2026
20	PMG Pohlmann Media Group AG	Indirect evidence	Inning Am Ammersee, GermanyHQ checked Sep 28, 2026	11-50	8 contacts →
	Indirect evidence “PMG Lösungen schaffen den Mehrwert, effizient zu sein und hörbar zu überzeugen.” Source: RevenueBase Database · checked Sep 28, 2026
21	BFW Kommunikationssysteme Gmbh	Indirect evidence	Langenhagen, GermanyHQ checked Sep 28, 2026	11-50	7 contacts →
	Indirect evidence “Die Bedürfnisse unserer Kunden bei der Kommunikation haben wir immer im Blick.” Source: RevenueBase Database · checked Sep 28, 2026
22	Steffel-Tk Gmbh	Indirect evidence	29331 Lachendorf, GermanyHQ checked Sep 28, 2026	11-50	6 contacts →
	Indirect evidence “Steffel entwickelt effiziente und zukunftsfähige Komplettlösungen für den gesamten Kommunikationsbereich – von der Vernetzung verschiedener Standorte über Unified Communications…” Source: RevenueBase Database · checked Sep 28, 2026
23	Net-Brain IT Consulting Gmbh	Indirect evidence	Berlin, GermanyHQ checked Sep 28, 2026	11-50	6 contacts →
	Indirect evidence “Die net-brain IT Consulting GmbH ist die Nachfolgeorganisation der Buchberger Information Technologies GmbH, welche 1989 von Lorenz Buchberger in Berlin gegründet wurde.” Source: RevenueBase Database · checked Sep 28, 2026
24	Telemaster Consulting Gmbh	Indirect evidence	Bad Fallingbostel, GermanyHQ checked Sep 28, 2026	11-50	6 contacts →
	Indirect evidence “Wir von der Telemaster Consulting GmbH beraten Unternehmen anbieterunabhängig im gesamten Telekommunikationsbereich.” Source: RevenueBase Database · checked Sep 28, 2026
25	Locanet Gmbh	Indirect evidence	Dortmund, GermanyHQ checked Sep 28, 2026	1-10	6 contacts →
	Indirect evidence “LocaNet, founded in 1996 and based in Dortmund, Germany, provides a wide range of VoIP based IT products and services.” 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: enterprise voice consultants. 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 enterprise voice consultants.
Partial evidence: Its own public description names part of enterprise voice consultants, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name enterprise voice consultants. 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 100 enterprise voice consultants based in Germany

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Enterprise voice consultants based in Germany at a glance

As of Sep 28, 2026

45.5%Verified-email coverage

7.6Average contacts per company

11-50Median size (employees)

9.0%Largest-city concentration · Berlin

Sep 28, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

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 100 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 enterprise voice consultants, 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 “enterprise voice consultants”. 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 enterprise voice consultants), 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 enterprise voice consultants, 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, 347 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.

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 enterprise voice consultants, 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 enterprise voice consultants are there based in Germany?

RevenueBase identified 100 enterprise voice consultants 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?

Ostertag Detewe, headquartered in Dusseldorf, tops this list with the largest team on record.

Which city has the most enterprise voice consultants?

Berlin leads with 9 headquartered companies, followed by Munchen (5) and Braunschweig (2).

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 347 verified decision-maker contacts tracked across these 100 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.