We Build at the Protocol Level of Telecom Networks — Where Most Engineering Companies Stop
Stacknize has over 14 years of hands-on experience building systems that operate at the core of telecom
networks — SIP signalling, SMSC messaging, USSD session management, and Intelligent Network integration. That engineering depth, rare in the software industry, is now our advantage in AI voice: the
same discipline that makes production telecom platforms reliable is what makes great AI voice applications.
The Distinction That Matters
There is a fundamental difference between telecom integration and telecom engineering. Integration
means connecting to an operator’s API – something most software companies can do. Engineering
means understanding the protocols, the network topology, the failure modes, and the business logic of
voice and messaging at a network level. Very few software companies operate at this depth.
Stacknize is one of them. Our engineers have built Ring-Back Tone platforms with IN node integration,
USSD applications that interface directly with the HLR via MAP protocol, and custom CRM systems that
manage the full VAS subscriber lifecycle for major operators. This is not system-integration work — it is
core telecom engineering. And it is the foundation on which we now build AI voice applications that
actually work in real operator environments.
Years of
Platform Engineering
Platform Engineering
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Projects Delivered
Across Countries
Across Countries
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Global Production Footprint
Live mission-critical systems deployed across continents.
What We Do
Not services we offer — platforms we have engineered, deployed, and watched run in
production for real clients across three continents.
Core Telecom Protocol Engineering
- SIP platform development and integration - Asterisk, FreeSWITCH, Kamailio for operator and enterprise voice
- SMSC integration - SMPP v3.4 protocol, SS7/MAP interfaces, transactional and promotional messaging at scale
- USSD application development - MAP protocol session management, interactive subscriber menus at zero data cost
- IN / CAMEL integration - Intelligent Network interfaces for real-time charging, service logic, and call control
- Telecom CRM systems - custom subscriber lifecycle management, VAS billing, service provisioning, and campaign tooling
Voice Application Development
- IVR systems - both traditional DTMF-based and modern natural language IVR running over SIP
- VoIP infrastructure - SIP trunking, softswitch integration, and enterprise voice platform configuration
- WebRTC applications - browser and mobile real-time audio/video for consultation and communication use cases
- Voice recording, transcription, and analytics - call logging, quality monitoring, and compliance tooling
AI-Enhanced Voice (Our Newest Frontier)
- Natural language IVR - LLM-powered conversational voice that replaces rigid DTMF menus
- AI voice bots over SIP - full-duplex AI agents running on real telephony infrastructure, not web widgets
- Real-time speech-to-text pipeline - Whisper-based STT optimised for conversational cadence and low latency
- TTS response synthesis - ElevenLabs and Azure TTS for natural-sounding AI voice output
How We Work
Five engineering capabilities, each built over years of real production experience — not
assembled from a services catalogue.
01
Telecom Assessment
We begin by understanding your network environment — operator stack, existing VAS infrastructure, billing systems, and integration constraints. No assumptions about what is technically possible.
02
Protocol-Level Build
Our engineers work at the protocol level — building and testing against real network interfaces, not simulated environments. QA includes live network testing where required.
03
Integration & Handover
Integration with operator infrastructure is handled end-toend – from SIG/MAP interfaces to billing mediation. Detailed technical documentation ensures your operations team can manage what we build.
Technology Stack
Three continents. Five platform domains. Real clients who trusted us with business-critical
systems. Here is what that produced.
SIP / VoIP
- Asterisk
- FreeSWITCH
- Kamailio
SMSC
- SMPP v3.4, SS7/MAP interfaces
USSD
- USSD gateway integration
- MAP protocol
- Session state management
IN / CAMEL
- Intelligent Network — real-time charging and service control interfaces
WebRTC
- Browser and mobile real-time audio/video
AI Voice
- OpenAI Whisper (STT)
- ElevenLabs / Azure Cognitive Services (TTS)
- GPT-4o (dialogue)
Admin & Portal
- Angular — operator CRM and management portals
Backend
- Node.js (NestJS)
- Java Spring Boot
- Python
Who This Is For
- Telecom operators building or upgrading VAS platforms — RBT, USSD applications, messaging infrastructure
- MVNOs needing telecom-grade platform engineering without a full in-house network team
- Enterprises with high inbound call volumes looking to automate with AI voice
- Healthcare, banking, or logistics organisations running voice-critical customer operations
- Technology companies needing deep telecom integration as part of a broader platform build
Need Engineering at the Protocol Level of a Telecom Network?
This is a specialised capability — and we are one of very few software companies that can
deliver it. Let’s have a technical conversation
Our Partner for
Software Innovation
