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Telecom engineering · Software · Germany

Built by people who've run the network. Now we build the tools.

Nerdwerk started inside operators' core networks, where legacy, hardware-bound test tools couldn't keep up with software-defined 5G. So we built our own: Teuphon, a cloud-native platform that loads your 5G core and IMS like hundreds of thousands of real phones.

See Teuphon Engineering services
5G standalone registration call flow A simplified ladder diagram between UE, gNB, AMF and AUSF showing registration request, authentication, security mode and registration accept, with Teuphon generating the UE side at scale. UE gNB AMF AUSF ×250,000 Registration Request Nausf_UEAuth Authentication Request Authentication Response Security Mode Command Security Mode Complete Registration Accept
NAS signalling over N1/N2 · the flows we integrated by hand are the ones Teuphon now runs at scale
2019
Delivering core network projects to operators since
250,000
Emulated subscribers in one Teuphon lab run
706,436
Busy-hour call attempts on just 2 load agents
Mar 2027
Commercial launch · POCs available today

Professional services

Engineers who have worked inside live networks

Operators, vendors and system integrators bring us in when a core network has to be integrated, tested or migrated on a deadline. That field work is where our products come from.

Core network integration

Design, integration and acceptance of 5G SA core, EPC and IMS, from first call to production cut-over.

5GCEPCIMSVoLTE · VoNR

Testing and validation

Functional, interoperability, load and regression testing, with test plans and automation that stay with your team.

SIPDiameterHTTP/2 SBIPFCP

Mission-critical and rail

Integration of mission-critical communication services for transport and public safety networks.

MCXFRMCSMCPTT

Project engineering teams

Experienced engineers for defined project scopes, on site or remote, managed against agreed deliverables.

On siteRemoteDE · FR · EU

How we build

From field notes to product

Every Nerdwerk tool starts as a problem we hit on a customer project. We only package it once it has proven itself in a lab.

STEP 1 · FIELD

See the failure modes

On integration projects we see where networks break: overload, misconfiguration, interop gaps between vendors.

→ real traffic profiles and edge cases
STEP 2 · LAB

Reproduce them

We rebuild those conditions in a lab, script them and measure them, until the behaviour is repeatable.

→ reusable scenarios and test scripts
STEP 3 · PRODUCT

Ship the tool

What works becomes software: cloud-native, browser-based and transparent about every component inside it.

→ Teuphon today, Twinstrike next

Product

Teuphon

Software that behaves like hundreds of thousands of phones, so operators can test their network before real customers do.

POC & demo available todayCommercial launch March 2027
What it does

Emulates large numbers of phones and the radio sites they connect through, and sends their traffic into your real core network.

Why it matters

Prove capacity, stability and failover before a launch or upgrade, without touching live customers.

What it covers

5G registration and data, voice and video calls (VoNR / ViNR) with supplementary services, and mission-critical push-to-talk (MCPTT).

Where it runs

Pure software on standard x86 or ARM64 servers in your own data centre, operated entirely from a web browser.

Lab run · VoNR scenario · 20 Sep 20262 load agents · 3 VMs · 10 vCPU in total
250,000
phones connected
100% set up successfully
125,000
voice calls completed
0.00% error rate
706,436
busy-hour call attempts
4,699 peak concurrent calls
500,000
PDU sessions active
internet + IMS
9.6ms
call set-up delay
median · 21 ms for 99%
4.4/ 5
voice quality (MOS)
"excellent" for 98% of calls
31,084
peak messages / s
signalling load
238,881
peak packets / s
user plane

Measured in the Nerdwerk lab. Scale further by adding load agents: roughly one agent per 100,000–125,000 voice subscribers, with one manager for all agents.

What operators test with Teuphon

Your 5G core and IMS under realistic load, across eight areas.

Capacity & busy hour

Maximum subscribers, busy-hour call attempts, messages/s and packets/s limits.

Voice & video calls

VoNR / ViNR set-up success, post-dial delay (P50 / P99), MOS and answer rate.

Registration & sessions

Registration, authentication, internet and IMS data sessions, QoS flows and slicing.

Supplementary services

Hold and resume, call forwarding and barring, with IPsec signalling and SRTP media.

Resilience & failover

Signalling storms, mass re-attach after an outage, geo-redundancy and disaster recovery.

Mission-critical (MCX)

MCPTT registration, group affiliation, private and group calls, floor control.

Security & overload

Internal and external DoS situations, and how the core protects itself under overload.

Acceptance & automation

Vendor acceptance and regression suites, sanity checks, and a REST API for CI pipelines.

How a test is built

Scenarios are plain configuration files. No programming required: edit the JSON directly and keep it in version control.

  1. 1

    Pick a template

    Attach, data, VoNR hold or forwarding, ViNR and more from the Scenario Library.

  2. 2

    Adjust the flow

    Edit the steps, targets and load in the JSON scenario file.

  3. 3

    Load it

    The scenario appears in the library, ready to run or to call from the REST API.

  4. 4

    Run & watch

    Live phones, sessions, messages/s and media per agent.

  5. 5

    Get the report

    A one-page result with 3GPP TS 28.554 KPIs, plus PDF.

// the four sections of a scenario (simplified)
"targets":     AMF and P-CSCF addresses
"subscribers": number ranges + SIM credentials
"workload":    target rate, max phones, duration
"workflow": [ 5G_REGISTER,
              PDU_SESSION_ESTABLISH,
              WAIT "5s",
              DYNAMIC_FLOW // VoNR call ]

Interface coverage

Current 3GPP reference-point support. Interfaces marked "project dependent" extend the same protocol engine and are delivered with customer projects.

InterfaceStatusCoverage
N1 / N2ReadyUE ↔ AMF and gNB ↔ AMF: registration, PDU session, handover and de-registration signalling
N3 / N9ReadyGTP-U user plane: uplink and downlink traffic, QoS flow / QFI classification
GmReadyUE ↔ P-CSCF: IMS registration (SIP / IMS-AKA), VoNR and ViNR call set-up and control
Gx · Rx · S6a · ShReadyDiameter, on the same core protocol engine
MC signallingMCPTT ready · rest in developmentUE ↔ MCX server: MCPTT group affiliation, floor control, private and group calls; MCData and MCVideo in development
N4 · N7 · N8 · N10 · N12 · N13Project dependent5G core internal interfaces (SMF, PCF, UDM, AUSF): full nodal simulation
Mw / ISCProject dependentInter-CSCF and application-server interworking on the existing SIP / IMS stack

Why Teuphon

Scales to real load

250,000+ subscribers validated in the lab. Need more? Add load agents.

100% browser-based

Nothing to install, patch or license on the client. Open it from any laptop, on any operating system.

Flexible scenarios

Plain JSON scenario files. New call flows are message templates, not new software.

European-built, on-prem

Developed in Germany and deployed entirely inside your data centre. Licences are checked offline, with no licence server.

Contact

Tell us what you need to test

Whether it's an integration project, a Teuphon POC or a Twinstrike partnership, write to us and an engineer will reply, not a sales script.

Email
contact@nerdwerk.eu
Company
Nerdwerk GmbH
Address
Daimlerstraße 31, 91074 Herzogenaurach, Germany