What estos does

estos GmbH is a privately-held German software vendor headquartered in Starnberg that builds Unified Communications and Collaboration (UCC) software for business teams, primarily in the DACH region. Its core platform, the ProCall product family (ProCall 8 for mid-market and ProCall Infinity for large enterprises), unifies voice, video, messaging, presence, and click-to-dial into a single client and layers on a modular set of add-ons including MetaDirectory (central directory), ECSTA (CTI middleware), ixi-UMS (unified messaging), ProCall Meetings (video), and integrations with Microsoft Teams, Apple CarPlay, DATEV, Microsoft Dynamics NAV, and ChatGPT. A core technical differentiator is multi-vendor telephony support, allowing customers to retain existing PBX investments while adding a unified softphone and presence layer, deployed under a "Next, next, finish" installation philosophy.

The company sells primarily via direct enterprise field sales supported by a partner/reseller channel accessible through the my.estos.de portal, with a secondary product-led growth motion via free software downloads and trials. Revenue is generated through software licensing and subscriptions (including enterprise-tier ProCall Infinity and module-based add-ons), with quote-based pricing that is not publicly disclosed. Named reference customers span IT services, accounting/finance, apparel (Schoffel), and professional services (ECOVIS), with the company explicitly citing 600,000+ users, 500+ cumulative years of internal UCC experience, and customer outcomes of €11k annual remote-workforce savings, 40% shorter response times, 30% better satisfaction (Gartner-cited), and 90-day ROI.

Go-to-market is vertical-aligned (Healthcare, Finance, Public Sector, Large Enterprises) with EU data-center residency and "Made in Germany" positioning as trust levers for regulated buyers. The company has no disclosed funding rounds, no recorded M&A activity, no published revenue, and no documented leadership changes in the source data, indicating a bootstrapped or founder-owned profile. Forward product signals include the ProCall NEX refresh, the ChatGPT integration, and the dedicated ProCall for Public Sector proposition, all pointing to continued product-surface expansion against a stable enterprise UCC/CTI core.

Name

estos

Legal name

estos GmbH

Website

https://estos.nl

Company type

Private

Operating status

Operating

Short description

estos GmbH is a privately-held German software vendor that builds Unified Communications and Collaboration (UCC) and CTI software (ProCall, MetaDirectory, ECSTA, ixi-UMS) for DACH enterprises and mid-market customers, integrating with Microsoft Teams, DATEV, and major PBX vendors.

Ownership category

akta.pro rank

Product category

Unified Communications Software

NAICS

Computer Systems Design and Related Services (5415), Computer Systems Design Services (541512), All Other Telecommunications (517810)

SIC

Communications Services, Nec (4899), Services-Computer Programming, Data Processing, Etc. (7370), Services-Computer Integrated Systems Design (7373)

akta.pro primary industry

Unified Communications (UCaaS) Apps (BPAMACAE)

akta.pro secondary industries

UCaaS Platforms & Suites (HDAIAHAA), Unified Communications & Contact Center for Workplace (UCaaS/VoIP, Meeting Rooms) (BPAEAIAE)

Keywords

• Unified communications software
• Computer telephony integration
• Collaboration platform
• Enterprise contact directory
• Unified messaging solutions

Headquarters

HQ city

Starnberg

HQ country

Germany

HQ region

Europe

Offices1 record

Markets served

GTM type

B2B

Offering type

Software

Cost components

Personnel, Technology or R&D, Marketing or Sales, Operations, Infrastructure

Revenue model

1. Software Licenses and Subscriptions: estos generates revenue through software licensing of its ProCall product suite, MetaDirectory, ECSTA, and ixi-UMS solutions. Given the enterprise nature of the products and focus on large organizations with ProCall Infinity, revenue is primarily from software licenses and subscriptions.

Go-to-market motion2 records

Distribution channels4 records

Marketing channels5 records

Core offering

estos develops and licenses Unified Communications and Collaboration (UCC) software for business teams, delivering voice, video, messaging, presence, contact management, and computer telephony integration in a unified client. Its flagship ProCall 8 product and ProCall Infinity deployment platform are aimed at enterprise and mid-market organizations, complemented by MetaDirectory, ECSTA (CTI middleware), ixi-UMS unified messaging, ProCall Meetings, and integrations with Microsoft Teams, Apple CarPlay, DATEV, Dynamics NAV, and ChatGPT.

Product overview

estos offers a unified communications and collaboration platform with ProCall as the core product family. ProCall 8 is the flagship UCC client with integrated voice, video, messaging, and collaboration capabilities. ProCall Infinity serves large enterprises requiring unlimited scalability. The product portfolio includes specialized modules: ProCall Meetings (video conferencing), ProCall ChatGPT integration (AI assistance), ProCall for Apple CarPlay and Microsoft Teams (device/platform integrations), MetaDirectory (enterprise directory management), ECSTA (CTI middleware), and ixi-UMS (unified messaging). These products work together seamlessly, allowing organizations to start with core telephony and add modules as needed, all managed through a unified interface with the 'next, next, finish' installation principle.

Differentiator

Problem solved

Functional benefit

Brands

• ProCall 8: Main unified communications and collaboration software product.
• ProCall Infinity
• MetaDirectory
• ECSTA
• ixi-UMS

Products and services

• ProCall 8 Primary Unified Communications and Collaboration (UCC) software client enabling voice, video, messaging, presence, and collaboration tools in a unified interface for business teams.
• ProCall Infinity UCC and CTI solution designed for large companies with unlimited scalability across multiple locations.
• ProCall Meetings Video conferencing and meeting capability integrated with ProCall 8 for business collaboration.
• MetaDirectory Central contact and directory management solution for enterprise-wide contact search and synchronization across multiple sources.
• ECSTA CTI middleware solution enabling computer telephony integration, allowing call control from desktop applications across supported telephony systems.
• ixi-UMS Unified Messaging Service solution consolidating voicemail, fax, and email into a single inbox across multiple channels.
• ProCall ChatGPT integration Generative-AI assistant integrated into ProCall for AI-powered communication and workflow assistance.
• ProCall for Apple CarPlay Enables making and receiving business calls via Apple CarPlay from the ProCall client for mobile workforce use.
• ProCall for Microsoft Teams Enhances Microsoft Teams with ProCall CTI and UC capabilities, integrating telephony, presence, and contact lookup into Teams.

Quantifiable outcome

• 11 thousand € annual savings with remote workforce
• +3 more outcomes

Named customers5 records

Segments4 records

Ideal customer profiles4 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Integration5 records

AI capability2 records

Feature8 records

Partnerships

Two partnerships are on record, tiered core.

• MicrosoftcoreTechnology or IntegrationProCall for Microsoft Teams integration makes Microsoft Teams even better by enhancing UC capabilities with estos technology.
• DATEVcoreTechnology or Integrationestos software integrated with DATEV accounting software, enabling 1,200+ employees to dial at the click of a mouse and search centrally for contacts within the DATEV ecosystem.

Scale indicators6 records

Recent moves6 records

Expansion highlights5 records

Broad incumbents

• Mitel: UC and telephony vendor with MiCloud and on-prem solutions. Comparable in multi-vendor PBX environments where estos' ECSTA and ProCall operate.
• Cisco (Webex): Incumbent UC and telephony vendor with Webex suite and Cisco BroadWorks. Competes in enterprise UCC and multi-vendor telephony environments where estos positions.
• Avaya: Legacy enterprise telephony and UC vendor with on-prem and cloud offerings. Competes with ProCall in CTI/multi-vendor integration scenarios.
• Microsoft (Microsoft Teams / Teams Phone): Global UCaaS incumbent bundling voice, video, meetings, and telephony into Teams. Direct competitor to ProCall's UC capabilities and an integration partner via ProCall for Microsoft Teams.
• Zoom (Zoom Workplace / Zoom Phone): Major UCaaS player with Zoom Phone, Meetings, and Team Chat. Overlaps with ProCall's unified voice/video/messaging proposition, particularly in mid-market and enterprise.

Direct peers

• Wildix: European UCaaS/collaboration vendor with PBX, voice, video, and contact center. Direct competitor in the European mid-market UCC segment.
• 8x8: Cloud UCaaS and contact center provider targeting mid-market and enterprise. Comparable in offering voice/video/messaging as a unified subscription platform.
• NFON: German/European cloud telephony and UCaaS provider directly competing with estos in the DACH market with a similar SMB/enterprise go-to-market.
• Swyx (Enreach): European UCaaS vendor (now part of Enreach) offering cloud PBX, telephony, and collaboration. Direct DACH competitor with overlapping product positioning to ProCall.
• RingCentral: Cloud-native UCaaS/CCaaS platform offering voice, messaging, video, and contact center. Competes with estos for enterprise communication spend, especially against ProCall Infinity.

Market position

Strengths4 records

Weaknesses4 records

Competitive moat4 records

Key risks5 records

Key highlights6 records

Customer concentration

• Facebookfacebook.com/estosGmbH
• LinkedInlinkedin.com/company/estos-gmbh

Revenue estimate

Valuation estimate

Number of profiles

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about estos