Sendium
The Open Source SMS Gateway
Scale Without Limits. Route Without Lock-in.
Sendium, the open-source SMS gateway is coming soon.
Unify your providers, optimize routing costs, and secure your data with a single, high-performance API.
SMPP Server & Client (full bind support)
Real-time DLR management
Advanced routing engine
Granular TPS control (rate limiting)
Modern, headless architecture
Protocol translation (HTTP ↔ SMPP)
Join Sendium's community and find out first when it gets released
What is Sendium
Sendium is an open-source, headless SMS gateway engineered for high-throughput delivery. Designed to sit seamlessly between your internal applications (CRMs, websites, IoT platforms) and your SMS connectivity (carriers, SMPP providers), it puts you firmly in control of your messaging infrastructure.
It lets you run your own gateway layer, which gives you the power to manage connections, adjust routing on the fly, prioritize traffic, and dictate fail-over rules. Built for maximum scalability and flexibility, Sendium eliminates vendor lock-in entirely and can be easily deployed across any on-premise or cloud environment.
How it works
-
Your application sends a message to Sendium over HTTP
-
Sendium applies routing rules (country/prefix, sender ID, message type, priority, etc.)
-
Sendium delivers through one or more SMPP connections to upstream providers
-
Delivery receipts (DLRs) come back asynchronously
-
Sendium normalizes the status and forwards it back to your systems (HTTP callbacks or SMPP reports
Use-cases
Offering an alternative to Kannel
If your gateway is hard to maintain, hard to staff for, and painful to extend — Sendium gives you the same core gateway functions in a modern, container-friendly stack.
Aggregators & hubs
Route traffic from multiple customers to multiple upstream carriers with clear rules (e.g., “UK → Carrier A, FR → Carrier B”), plus failover.
Enterprise notification systems (OTPs, alerts, priorities)
Run Sendium on-prem or in your private cloud. Keep control of routing, logs, and security posture — while prioritizing critical traffic (e.g. OTPs) over non-critical messaging.
IoT / M2M signaling
Translate API commands from your IoT platform into SMS signals when data coverage is unreliable.
What's next
Phase 1: Resilience & compatibility
- Kannel configuration parity (easy migration mindset)
- SMPP over TLS
- Prometheus /metrics endpoint (Grafana-ready observability)
- Priority queues & fairness (OTPs always jump the line)
Phase 2: Advanced routing & intelligence
- Automatic fallback/retry paths
- Health-based rerouting (low deliverability detection)
- Load balancing across providers
- Billing-aware + HLR/MNP-informed routing
Phase 3: Scale & integrations
- Apache Kafka integration for massive async throughput
- Foundations for multichannel routing (e.g., WhatsApp, RCS, Email)
The project Open Source SMS Gateway is carried out within the framework of the National Recovery and Resilience Plan Greece 2.0,
funded by the European Union – NextGenerationEU. https://digitalsme.gov.gr
Security is Important
Information is power, so we ensure that your information and data are kept safe, following the latest technology trends.
ISO 27001:2022 Certified
Cytech Mobile has been certified with ISO27001:2022 for the Development and Provision of Software and Services.
ISO 27701:2019 Certified
Cytech Mobile has been certified with ISO27001:2022 for the Personal Data protection during the Development and Provision of Software and Services.
Find out more about Sendium, the Open Source SMS Gateway
Let’s work together
We are passionate about innovation, brilliant ideas and the execution that brings it all together in one beautiful experience. Contact us to find out more about us and how we can work together.
