Dus.net

What Dus.net does

Dus.net GmbH is a privately held German telecommunications company founded in 2004 and headquartered in Düsseldorf, operating a SIP-based VoIP infrastructure that delivers cloud telephony, SIP trunking, and value-added communications services to small and medium businesses, individual consumers, larger enterprises with legacy PBX systems (Auerswald, 3CX, Starface, Panasonic), and developer/integrator customers. The technical foundation is differentiated: the company operates its own Autonomous System (AS40999) with redundant BGP4 transit hosted at the Connecta Parc carrier hotel (Digital Realty) in Düsseldorf, and provides TLS/SRTP-encrypted HD voice, T.38 fax, DDI trunking, ACD queuing, and IVR menus as core features rather than paid add-ons.

The product portfolio is organized around five sub-brands. DUStel is the tariff family spanning a free prepaid starter, a €7.90/month complete plan for private customers, and a fully configurable business flex plan starting at €10.02/month net for SMBs and enterprises. DUSphone is an encrypted VoIP softphone for iOS and Android. Sipona is a hosted-in-Germany web platform combining meetings, telephony, CRM, and team collaboration. DUSapi is a tiered VoIP REST API (Basic €19, Pro €49, Enterprise €149/month) with webhooks, CDRs, and OAuth 2.0 aimed at CRM/ERP integrators. DUSqueue is an ACD add-on for business flex subscribers, and Rechtssicheres Fax provides SHA256-fingerprinted, PKCS#7-signed fax delivery confirmation. International virtual numbers are offered in 81 countries.

Dus.net monetizes through recurring subscription tariffs, per-second usage-based call charges, VoIP-API subscriptions, fax services (€0.03 per received page), and number setup/administration fees. Distribution is 100% direct and self-serve via the my.dus.net customer center and the multi-language website (DE/EN/FR/ES), with no channel partners. The company is shareholder-managed by managing directors Udo Ries and Andree Meier, holds Bundesnetzagentur registration (Dienstregistrierungsnummer 06/289), is GDPR-compliant, and has operated without external funding for over 20 years.

Name

Dus.net

Legal name

dus.net GmbH

Website

https://dus.net

Company type

Private

Founded year

2004

Operating status

Operating

Headcount range

11–50 employees

Short description

Dus.net is a Düsseldorf-based, privately held VoIP/telecommunications company operating its own SIP infrastructure (AS40999) to deliver cloud telephony, SIP trunking, encrypted HD voice, fax, and a developer API to SMBs, consumers, and enterprises across 81 countries.

Ownership category

akta.pro rank

Product category

Cloud Telecommunications

NAICS

Computing Infrastructure Providers, Data Processing, Web Hosting, and Related Services (5182)

SIC

Services-Telephone Interconnect Systems (7385), Telephone Communications (No Radiotelephone) (4813)

akta.pro primary industry

Cloud PBX & Hosted Telephony (HDAIAHAB)

akta.pro secondary industry

VoIP Access & ITSP Services (HDAIAHAD)

Keywords

• Cloud telephony services
• VoIP telecommunications
• SIP trunking
• Cloud PBX
• VoIP API

Headquarters

HQ city

Düsseldorf

HQ country

Germany

HQ region

Europe

Offices2 records

Markets served

GTM type

B2B and B2C

Offering type

Services

Cost components

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

Revenue model

1. Monthly Subscription Tariffs: Recurring monthly fees from DUStel tariff plans (starter, complete, business flex) with tiered feature sets including SIP connections, lines, and optional add-ons like flat rates and ACD systems.
2. Usage-Based Call Charges: Per-second billing for call destinations not covered by flat rates; call charges vary by destination (e.g., German landline from €0.002/min, German mobile from €0.098/min on business plans). Prepaid for starter, postpaid for complete/business flex.
3. VoIP-API Subscriptions: Monthly API subscriptions (Basic €19, Pro €49, Enterprise €149) with included webhook deliveries; additional deliveries billed per unit. Plus separate telephony costs for calls/SMS.
4. Fax Services: Fax-to-email at €0.03 per received page; email-toFax and fax send from customer center billed per destination rates.
5. Phone Number Services: One-time setup fees and annual administration fees for new local phone numbers (e.g., €9.90 setup + €5.00/year per number on starter); porting fees for number transfers.
6. International Phone Numbers: Monthly and setup fees for international virtual numbers across 81 countries and 4,625 prefixes; subject to country-specific regulatory requirements and minimum 3-month contracts.

Pricing tiers

Go-to-market motion2 records

Distribution channels4 records

Marketing channels5 records

Core offering

dus.net GmbH provides cloud-based VoIP telecommunications services, including cloud PBX, SIP trunking with DDI, encrypted HD voice telephony (TLS/SRTP), local and international phone numbers, and fax services. The portfolio spans the DUStel tariff family (starter free tier, complete for private customers, business flex for companies), the DUSphone softphone for iOS/Android, the sipona.de unified communications platform, the DUSapi REST API for developers, and a legally compliant fax service with cryptographic proof of delivery.

Product overview

Dus.net operates as a VoIP telecommunications provider offering a cloud-PBX and SIP-trunking platform. The product portfolio centers on the DUStel tariff family (starter, complete, and business flex) for voice, fax, and number services, supplemented by the DUSphone mobile softphone app (iOS/Android), the sipona.de web communications platform (meetings, CRM, teamwork), the DUSapi VoIP-API for developer integration, and an optional legally secure fax service (Rechtssicheres Fax) with cryptographic proof-of-delivery. The DUSqueue ACD system extends business flex for professional call center use. The platform is built around SIP-based infrastructure with TLS/SRTP encryption, HD voice, IPv4/IPv6 connectivity, and a customer center serving as the virtual PBX management interface.

Differentiator

Problem solved

Functional benefit

Brands

• DUStel: VoIP tariff brand offering starter, business flex, and complete plans for cloud telephony and SIP trunking services.
• DUSphone
• Sipona
• DUSapi
• DUSqueue

Products and services

• DUStel starter

Quantifiable outcome

• 99% average annual service availability guaranteed
• +2 more outcomes

Named customers4 records

Segments4 records

Ideal customer profiles4 records

Technology focussed Yes

API detail

Has API

Yes

API docs

API detail

Core technology

AI maturity

App detail

Integration9 records

Feature7 records

Partnerships

One partnership is on record.

• Digital Realty (formerly Interxion)coreOthersCore infrastructure partner. dus.net's servers and Autonomous System AS40999 are hosted at the Connecta Parc data center operated by Digital Realty in Düsseldorf — the most significant data center in North Rhine-Westphalia, providing direct carrier hotel connections.

Scale indicators3 records

Recent moves6 records

Expansion highlights6 records

Emerging players

• Twilio (Voice/Programmable Voice): Global cloud communications platform with SIP trunking and Programmable Voice APIs. Competes with dus.net's DUSapi in the developer/API telephony segment, particularly for global CRM integrations.

Direct peers

• Sipgate: German VoIP/SIP trunking and cloud PBX provider headquartered in Düsseldorf. Directly competes with dus.net across SMB and consumer telephony tariffs, SIP trunking, and number services in the same German market.
• NFON: European cloud telephony/UCaaS provider headquartered in Munich with strong DACH presence. Competes in cloud PBX, SIP trunking, and integrated communications for SMBs and enterprises, including API-driven integrations.
• Placetel: German cloud PBX and VoIP provider owned by Gamma Communications. Directly competes with dus.net on cloud telephony tariffs, SIP trunking, and integration with German TK-Anlagen.
• Easybell: German VoIP and SIP trunking specialist focused on SMB and residential customers. Competes with dus.net on per-line pricing, SIP trunking for PBX systems, and customer-center-based self-service.

Broad incumbents

• 1&1 Versatel: German telecom carrier (part of United Internet) offering business telephony, SIP trunking, and cloud PBX. Competes with dus.net in SMB/enterprise voice with bundled internet and mobile offerings.
• Vodafone Germany: Major German carrier with business SIP trunking and OneNet Pro UCaaS offerings. Competes with dus.net primarily in enterprise segments with full convergence across fixed, mobile, and cloud.
• Vonage (now part of Ericsson): Global UCaaS/CPaaS provider offering cloud PBX and developer APIs. Competes with dus.net across both SMB cloud telephony and enterprise API-driven communications.
• Deutsche Telekom (T-Systems / Telekom Geschäftskunden): Incumbent German carrier offering SIP trunking, cloud PBX (DeutschlandLAN), and managed voice services. Competes broadly with dus.net across enterprise and SMB segments with bundled fixed/mobile offerings.

Others

• 3CX: Software-based PBX vendor whose systems dus.net explicitly supports via SIP trunk. Adjacent ecosystem partner and indirect competitor for end-customer telephony spend; complementary rather than directly overlapping.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks6 records

Key highlights6 records

Customer concentration

• Xx.com/dusnet_gmbh

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 Dus.net