SMPP gateways and SMS integration built by people who have done it before.
SMPP is a protocol most developers never touch, and the details bite: binds, windows, delivery receipts, encoding, concatenation. We build SMPP 3.4 and 5.0 gateways, ESME clients, and HTTP-to-SMPP bridges that connect your applications to aggregators and carrier SMSCs, with real delivery receipts, correct Unicode and multipart handling, throughput control, and multi-provider failover. Telecom messaging done right.
SMPP looks simple in the spec and breaks in production in specific, painful ways.
- A naive client that drops the connection under load because it ignores windowing and enquire_link keepalives.
- Long messages that arrive split into pieces, or Unicode text that turns into garbage, because encoding was never handled properly.
- Delivery receipts ignored, so you know a message was submitted but have no idea whether it actually arrived.
- A single aggregator with no failover, so their outage becomes your outage.
- Throughput throttled or connections banned because the gateway does not respect the provider's rate limits.
A gateway that respects the protocol and keeps messages flowing.
- Full bind lifecycle done correctly: transmitter, receiver, and transceiver, with enquire_link keepalives and clean reconnection.
- Correct encoding across GSM 03.38, UCS2 for Unicode, and concatenated multipart messages with proper UDH.
- Delivery receipts parsed and matched back to the original message, so you get true delivery status.
- Multi-aggregator connectivity with failover and routing, plus windowing, rate limiting, and persistent queues under load.
- A clean HTTP or REST API in front, so your applications send SMS without ever seeing the SMPP complexity.
What an SMPP gateway engagement covers
ESME Client or SMPP Server
A client to connect to aggregators and SMSCs, or a server and simulator to accept connections from your own systems.
HTTP / REST to SMPP Bridge
A simple messaging API for your applications, with all SMPP handling hidden behind it.
Encoding and Concatenation
GSM 03.38, UCS2 Unicode, and correct multipart UDH so long and non-Latin messages arrive intact.
Delivery Receipt Handling
DLR parsing and correlation back to the original message for real, per-message delivery status.
Multi-Provider Routing and Failover
Several SMSC connections with routing rules and automatic failover so delivery survives a provider outage.
Throughput, Queuing, and Handover
Windowing, rate limiting, and durable queues for high volume, plus documentation and post-launch support.
How we run an SMPP gateway project
Discovery
We map your providers, expected volume, message types, and delivery requirements, and confirm the exact SMPP dialect each provider expects.
Prototype Against a Real SMSC
A working bind and round-trip against your provider or a simulator, proving encoding, DLRs, and throughput before the full build.
Build and Harden
The full gateway with routing, failover, queuing, and rate limiting, tested against the failure cases that matter.
Deploy and Handover
Production deployment, monitoring, documentation, and a support window so the gateway runs reliably at volume.
The messaging stack we build on
SMPP work rewards knowing the protocol's sharp edges. We build on libraries and infrastructure that hold up under real traffic.
.NET and Java SMPP libraries
Proven SMPP implementations as a foundation, extended for your providers' specific quirks and TLVs.
Node.js for HTTP bridges
Fast, I/O-friendly HTTP and REST front ends that translate simple API calls into SMPP under the hood.
Message queues (RabbitMQ, Redis)
Durable queuing so no message is lost under load and traffic can be smoothed to provider limits.
SQL Server and PostgreSQL
Message logging, DLR correlation, and reporting that survives restarts and scales with volume.
Persistent connections and windowing
Correct handling of binds, windows, and keepalives so throughput stays high and connections stay up.
Monitoring and alerting
Visibility into connection health, throughput, and delivery rates so problems surface immediately.
Protocols and concepts we work with
SMPP gateway questions we get asked
Related services you might need
Custom Software Development
The parent practice: domain-specific tooling, background services, and legacy modernization across many stacks.
Learn moreWindows Service Development
The reliable background workers that keep an SMPP gateway bound, queued, and delivering around the clock.
Learn moreDevOps and Cloud
Deployment, scaling, and monitoring for a messaging platform that has to stay up under load.
Learn moreNeed SMS at scale, or an SMPP integration that actually holds up?
Tell us your providers, your volume, and your message types. We will tell you honestly what a robust gateway looks like. Fourteen years of shipping software other firms turn down, including the telecom messaging work most of them will not go near.