A compact, turnkey mobile core built for environments where failure is not an option - Control Plane and User Plane, 4G and 5G, on a single virtual appliance or bare metal host. x86-64 and ARM64. Minimal footprint. Maximum reliability.
Request Early AccessA fully integrated mobile core delivered as a single deployable image. It launches a complete 4G EPC and 5G core, including both Control Plane and User Plane functions, on SndbufOS, our purpose-built operating system. With support for KVM, VMware, Hyper-V, and Proxmox, there's no need for container orchestration or proprietary hardware. Connect it to your RAN over standard 3GPP interfaces.
Small footprint means it runs on hardware you already have: an industrial PC at the edge of a factory floor, a ruggedized server in a mining hut, a rack unit in a port control room. x86-64 and ARM64 supported out of the box.
Built by engineers who spent over fifteen years shipping mobile core software to production. Engineered for reliability, tested for real-world conditions — built for operational simplicity, predictable performance under heavy load, and durability in challenging environments.
Whether you need a network up in an afternoon or a hardened multi-site deployment integrated with your existing operations stack, SendBuffer Mobile Core scales to meet you.
One server. Operational in under an hour. The default configuration covers the vast majority of private network deployments out of the box - no professional services, no integration project.
High-availability setup with active/standby failover, multi-vendor RAN connectivity, and network slicing for traffic isolation. Managed via REST API, with Prometheus metrics and structured logging.
For operators with more complex requirements, SendBuffer Mobile Core supports advanced network deployments - multi-site, multi-tenant, and integrated with your existing operations stack.
Security in SendBuffer Mobile Core is not a feature layer added on top. It is a design constraint that shapes every component, from the boot sequence to the management API. In private network deployments - mines, defense installations, critical infrastructure - the core is not just connectivity infrastructure. It is a security perimeter.
Every internal component is mutually authenticated - no implicit trust between services, every API call authorized by RBAC and logged. The management plane is fully isolated, access is least-privilege, and every action leaves a tamper-evident audit trail. A compromised component cannot pivot to reach subscriber data or the rest of the system.
We treat it accordingly.
The trust chain starts before the OS. Verified boot cryptographically attests every component at startup. A compromised binary does not run - and a compromised process cannot escalate.
A smaller codebase means fewer CVEs. We ship only what private network deployments need - no bundled telemetry agents, no unused protocol stacks, no debug interfaces left open. The SBOM is published so you know exactly what is running on your hardware.
All data at rest is encrypted with LUKS2/AES-256-XTS. No vendor telemetry, no analytics callbacks. What happens on your site stays on your site - enforced by architecture, not policy.
Our core connects to any RAN over standard 3GPP interfaces - S1 for 4G, N2/N3 for 5G. If it speaks the protocol, it works. From the world's largest vendors to open-source SDR platforms.
SendBuffer Mobile Core runs entirely on-premises - and so does every management tool that comes with it. No cloud portal, no SaaS dashboard, no vendor access required.
Every deployment ships with a built-in web interface accessible directly from the appliance - designed for the engineers who run the network, not for the engineers who built it. Configure subscribers, APN/DNN profiles, QoS policies, and network slices. Monitor live sessions, authentication events, and user plane throughput in real time. No client to install, no remote portal to log into - just open a browser on your local network.
We started building private mobile networks when the industry was still arguing about whether enterprises would ever need cellular. We shipped on 3G. We rebuilt for 4G. We rebuilt again for 5G. Each time, not because the previous product failed - but because we understood it deeply enough to know how to do it better.
We have worked with customers whose use cases do not appear in white papers. Underground mines where the network topology changes as the extraction front moves. Defense deployments where the entire infrastructure fits in the back of a vehicle. Ports where a single dropped session means a crane stops. Oil rigs where maintenance windows are measured in months, not days.
We know what happens when a private network runs in production for five years, not five hours. We know which edge cases surface at scale. We know what breaks under environmental stress, what fails during software upgrades, and what operators actually need at 3am when something goes wrong. That knowledge is built into design decisions.
You are not betting on a first-generation product. You are deploying software built by a team who buitl three generations of mobile technology.
SendBuffer Mobile Core is deployed where connectivity is operational infrastructure - not a convenience.
Underground operations, remote extraction sites, and ATEX-classified zones require connectivity that does not depend on surface infrastructure or cloud uplinks. SendBuffer runs standalone, survives network partitions, and recovers automatically.
Tactical and base camp deployments demand air-gapped operation and rapid setup. SendBuffer comes up in minutes on field hardware, with no external dependencies and no data leaving the perimeter. NATO-frequency RAN compatibility included.
High-density outdoor environments - cranes, vehicles, vessels, handheld terminals - benefit from dedicated private LTE/5G coverage. SendBuffer handles the core, you choose the radio from any vendor in the market.
Power grids, oil and gas facilities, and water management systems cannot tolerate public network dependency. Per-subscriber VRFs keep SCADA and operational traffic hard-isolated from corporate and maintenance traffic on the same infrastructure - separate routing domains, separate security perimeters, single core.
AGVs, robotics, and M2M communication demand deterministic latency with local data breakout. VRF-based traffic segmentation and network slicing keep OT isolated from IT at the routing layer - not just the policy layer. Each production zone gets its own forwarding domain, QoS profile, and local breakout point.
Multi-building campuses, universities, and enterprise sites need more than connectivity - they need routing. SendBuffer supports per-tenant VRFs, dynamic routing (BGP and OSPF) on the N6/SGi interface, and granular traffic segmentation policies. Each department or business unit gets its own routing domain - isolated, auditable, and managed from a single control plane.
Rail, highways, and urban transit networks increasingly rely on private cellular for signaling, monitoring, and passenger services. Dynamic routing and traffic segmentation let you run signaling, CCTV, and passenger WiFi on the same radio infrastructure with full isolation between services. SendBuffer connects to any compliant trackside or roadside RAN without vendor lock-in.
When you build mission-critical network infrastructure - for a mine, a port, a defense installation, or a utility - the software running it matters. Not just technically - politically and strategically. SendBuffer is entirely designed and built in Europe, by a team with deep roots in the Western telecom industry. No foreign government has a claim on our code, our company, or our roadmap.
Every layer of the stack - from SndbufOS at the base to the mobile core to the management plane - is developed and auditable by a team you can meet, question, and hold accountable. We publish a full software bill of materials. We support air-gapped deployments by design. Your network data never leaves your premises, and no feature of our software dials home.
In a market where critical infrastructure software increasingly comes from vendors whose loyalties are opaque, that is not a small thing. It is the foundation everything else is built on.
SendBuffer uses a simple, operator-friendly licensing model - no surprises, no vendor lock-in.
Your license never expires. Pay once and run SendBuffer for as long as you need - in production, on your hardware, air-gapped from everything including us. There is no subscription that can be pulled, no annual renewal that takes your network down.
One payment. Yours to keep.
A small annual fee covers all software updates for the year - new features, protocol upgrades, security patches, and compatibility with new RAN equipment. Skip a year and your current version keeps running. If you want to resume updates after a lapse, a new license at full price is required.
Stay current for a fraction of the initial cost.
No usage metering. No per-subscriber fees. No hidden costs tied to how many devices connect to your network.
We are working with a select group of operators and system integrators ahead of general availability. If you are deploying a private network in a demanding environment, we want to talk.
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