DeTeWe Communications

What DeTeWe Communications does

Ostertag DeTeWe GmbH, operating until recently as DeTeWe Communications, is a Düsseldorf-based German ICT system integrator and managed services provider with 250 employees across ten German locations. The company plans, implements, and operates cloud-based and on-premise telecommunications and IT infrastructure for enterprise customers, federal/state/municipal public administrations, banks, healthcare organisations, and automotive/industrial firms. Core proprietary technology includes the YOUC Connect / OD Cloud virtual PBX (ISO 27001-certified, georedundant, with 99.9% availability), OD Connect Teams (four deployment modes for Microsoft Teams telephony integration), OD Attendant (web-based operator console), and OD Cloud Alarm Server (mass alerting for crisis communication). The stack is augmented by a partner ecosystem spanning Microsoft, Zoom (strategic partnership announced February 2026), Luware (Platinum Partner for Teams-native contact center), Sikom (AgentOne omnichannel), AudioCodes (SBC), Extreme Networks, ecotel, and QUMEA (healthcare IoT).

The business generates revenue across five streams: subscription cloud communications, recurring managed services, professional services and implementation, multi-carrier connectivity, and hardware sales, with a modular pay-per-module pricing model for YOUC Connect and quote-based contracting. Go-to-market is hybrid: direct enterprise field sales plus inside sales, supplemented by channel partners and ten delivery locations across Germany. Customer concentration is vertical-led, with healthcare cited at a 25% market share and a 99-year longest-standing relationship, complemented by public sector, financial services (MiFID II/BAIT/VAIT-compliant deployments), and automotive/manufacturing accounts. The company reports over 91% customer satisfaction from a 2022-2023 survey of 593 customers and is privately held with no disclosed external funding, no M&A history, and no subsidiaries.

Name

DeTeWe Communications

Legal name

Ostertag DeTeWe GmbH

Website

https://ostertagdetewe.de

Company type

Private

Founded year

1995

Operating status

Operating

Headcount range

101–250 employees

Short description

Ostertag DeTeWe (formerly DeTeWe Communications) is a Düsseldorf-based German ICT system integrator with 250 employees across ten locations, providing cloud PBX, Microsoft Teams integration, contact center, managed services, and multi-carrier connectivity to healthcare, public administration, financial services, and enterprise customers.

Ownership category

akta.pro rank

Headquarters

HQ city

Reutlingen

HQ country

Germany

HQ region

Europe

Offices3 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

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

Revenue model

1. Cloud Communication Subscriptions: Subscription-based cloud phone system (YOUC Connect / OD Cloud) with modular pricing, per-user or per-feature billing for internal and external telephony, collaboration, and contact center capabilities.
2. Managed Services: Ongoing managed services covering operation, monitoring, and support of customer IT and telecommunications infrastructure, delivered as a scalable service tailored to customer requirements.
3. Professional Services & Implementation: Consulting, project implementation, integration, training, and workshops for telecommunications solutions, contact center deployments, and digital transformation projects.
4. Carrier Services: Multi-carrier connectivity services providing redundant internet connections, SIP trunks, VPN networks, and data connectivity across Germany with high availability.
5. Hardware Sales: Sale of end devices, IT infrastructure components (racks, UPS), DECT systems, and smartphones as part of integrated communication solutions.

Pricing tiers

Go-to-market motion2 records

Distribution channels3 records

Marketing channels10 records

Core offering

Ostertag DeTeWe plans, implements, and operates cloud-based and on-premise telecommunications and IT infrastructure for enterprises, public sector, and healthcare organizations in Germany. Core offerings include a proprietary cloud PBX platform (OD Cloud / YOUC Connect), Microsoft Teams and Zoom telephony integration, multi-carrier connectivity, contact center solutions, and end-to-end managed services delivered across ten German locations.

Differentiator

Problem solved

Functional benefit

Products and services

• YOUC Connect (Cloud PBX) Proprietary virtual PBX (cloud phone system) offering georedundancy, ISO 27001 certification, Microsoft Teams integration, CRM integration, and call center functionality. Scalable for businesses of any size, deployable on-premise, public-cloud, or hybrid.
• OD Connect Teams Microsoft Teams telephony integration service offered in four deployment variants (SBC, Pure, Hybrid, Cloud) that connects Teams with external PSTN telephony, with automated user provisioning and number portability for enterprise customers.
• OD Attendant Web-based receptionist/operator console for enterprises, with real-time information display, calendar integration, Microsoft Teams and Outlook integration, call park functionality, and GDPR compliance.
• OD Cloud Alarm Server Cloud-based alarm management platform supporting mass alerting of thousands of simultaneous SMS recipients, IoT sensor integration via local gateway, and high-availability crisis communication for production facilities and buildings.
• OD Cloud (Healthcare) 100% GDPR-compliant virtual phone system certified for acute care clinics, with unlimited line capacity, 99.9% availability, automatic updates, and Microsoft Teams extension support, tailored for hospitals, rehabilitation clinics, and nursing homes.
• Managed Services Ongoing operation, monitoring, and support of customer IT and telecommunications infrastructure, delivered as a scalable service tailored to customer requirements to reduce in-house IT burden.
• Monitoring Services Proactive monitoring of customer IT, network, and telecommunications environments to detect and resolve incidents and ensure service availability.
• Multi-Carrier Connectivity Services Multi-carrier connectivity services providing redundant internet connections, SIP trunks, VPN networks, and data connectivity across Germany with a multi-provider architecture for maximum availability.
• Contact Center Solutions Omnichannel contact center solutions integrating Luware Nimbus (Microsoft Teams) and Sikom AgentOne platforms, providing voice, chat, video, bots, intelligent routing, call analytics, and MiFID II-compliant recording for enterprise customers.
• Microsoft 365 Solutions Deployment, integration, and managed services around Microsoft 365 and Microsoft Teams, including Teams telephony integration and OD Managed Teams for full operational responsibility of Teams environments.
• Mitel Solutions Unified Communications and collaboration solutions based on Mitel platforms, offered as part of the company's portfolio for enterprise customers.
• Zoom Collaboration Solutions Managed services portfolio for Zoom Phone, Zoom Workplace, Zoom Contact Center, and Zoom AI Companion delivered as a strategic Zoom partner for German enterprise customers, government agencies, and healthcare organizations.
• Enterprise Network and Security Solutions Enterprise network infrastructure and security solutions including LAN/WAN, WLAN, VPN, endpoint security, cloud integration, and AI-driven network automation, delivered with Extreme Networks as Excellence Partner.
• Public Administration ICT Solutions Tailored ICT and communications solutions for federal, state, and municipal public sector organizations, including framework agreement participation, BSI and ITZ compliance, security clearance, and field-worker mobility.
• Financial Services Communications Solutions Omnichannel contact center and telephony solutions for banks and financial institutions with MiFID II-compliant recording, MaRisk/BAIT/VAIT regulatory compliance, multi-carrier connectivity, and scalable VPN networks.
• Professional Services and Implementation Consulting, project implementation, system integration, training, and workshop services for telecommunications, contact center, and digital transformation projects delivered to enterprise customers.

Quantifiable outcome

• 91%+ customer satisfaction (survey of 593 customers)
• +3 more outcomes

Named customers2 records

Segments5 records

Ideal customer profiles5 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Integration11 records

AI capability11 records

Feature5 records

Partnerships

Five partnerships are on record, tiered core and minor.

• Zoom Communications, Inc.coreStrategic or Co-development Partner · 24 February 2026Strategic partnership announced February 2026 for the German enterprise collaboration market. Ostertag DeTeWe integrates the full Zoom portfolio including Zoom Phone, Zoom Workplace, Zoom Contact Center, and Zoom AI Companion, targeting enterprise customers, government agencies, and healthcare organizations with managed services.
• MicrosoftcoreTechnology or IntegrationTechnology integration partner for Microsoft 365 and Microsoft Teams. Ostertag DeTeWe offers OD Connect Teams for Teams telephony integration (SBC, Pure, Hybrid, Cloud models) and OD Managed Teams for full operational responsibility of Teams environments. YoUC Connect also integrates with Microsoft Teams.
• LuwarecoreStrategic or Co-development PartnerSwiss provider of Contact Center solutions for Microsoft Teams. Ostertag DeTeWe holds Platinum Partner status — the highest level in Luware's partner program. Partnership focused on omnichannel contact center deployments with Luware Nimbus integrated into Microsoft Teams.
• QUMEAminorStrategic or Co-development PartnerSwiss e-Health tech company. Ostertag DeTeWe is the first QUMEA partner in Germany, deploying radar-based 3D sensors for contactless movement analysis in nursing homes and hospitals to prevent falls and hazardous situations, contributing to the digital transformation of healthcare.
• Sikom Software GmbHminorStrategic or Co-development PartnerPartnership to integrate Sikom AgentOne platform into Ostertag DeTeWe's contact center portfolio, enabling AI-powered, omnichannel customer communication for on-premise, private cloud, and hybrid deployments.

Scale indicators6 records

Recent moves6 records

Expansion highlights6 records

Regional players

• Plusnet GmbH: Plusnet is a German business telecom and connectivity provider (United Internet subsidiary) offering IP-VPN, SIP trunking, and unified communications for SMB and mid-market — a regional competitor in the same German B2B communications space.

Direct peers

• Q.beyond AG (formerly QSC AG): Q.beyond is a German managed ICT services and cloud provider serving mid-market and enterprise customers across Germany, with comparable UC, cloud, and SAP/managed services overlap to Ostertag DeTeWe.
• NFON AG: NFON is a European cloud telephony / UCaaS provider headquartered in Germany. It directly competes with Ostertag DeTeWe in hosted PBX, contact center, and Microsoft Teams integration, sharing the same mid-market and enterprise German customer base.
• ecotel communications AG: ecotel is a German B2B telecommunications carrier and UCaaS provider serving SMBs and mid-market with SIP trunks, hosted PBX, and multi-carrier connectivity — closely mirroring Ostertag DeTeWe's Carrier and Unified Communications offerings in the same German market.
• Enreach (formerly Dstny): Enreach is a European UCaaS and contact center vendor active in Germany, Benelux, and the Nordics. It offers cloud PBX, Teams integration, and managed services comparable to Ostertag DeTeWe's YOUC Connect and OD Cloud portfolio.

Broad incumbents

• RingCentral, Inc. RingCentral is a global cloud UCaaS/CCaaS leader competing directly for German enterprise communications spend. As Zoom and RingCentral expand direct sales in Germany, Ostertag DeTeWe faces increasing competitive pressure on its integration services.
• 8x8, Inc. 8x8 is a global cloud UCaaS and contact-center provider expanding into the European mid-market. It competes for similar cloud telephony and contact-center customers in regulated verticals across EMEA.
• Atos Deutschland (Eviden): Atos (now Eviden) is a large European IT services incumbent with significant German public-sector and healthcare presence. It competes with Ostertag DeTeWe for large public-administration and healthcare modernization contracts, though typically at much larger scale.
• Avaya Holdings: Avaya is a global incumbent in enterprise unified communications and contact center, with extensive German enterprise deployments. It competes with Ostertag DeTeWe for the same large-organization telephony and contact-center modernization budgets.
• Mitel Networks Corporation: Mitel is a global incumbent UC vendor whose on-premise and cloud communications platforms are resold and integrated by Ostertag DeTeWe. Mitel competes for the same mid-market and enterprise telephony budgets and is both partner and competitor.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights6 records

Customer concentration

• Xxing.com/companies/ostertagdetewe
• YouTubeyoutube.com/channel/UCTCWDfdnB6uwcvXhofFCALw
• Facebookfacebook.com/ostertagdetewe
• LinkedInlinkedin.com/company/ostertagdetewegmbh
• Instagraminstagram.com/ostertagdetewe

Revenue estimate

Valuation estimate

Number of profiles

Profiles2 records

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 DeTeWe Communications