14 Years at the Core of Telecom Networks - Now
Powering AI Voice Applications
Stacknize has built and deployed production telecom platforms — Ring-Back Tone systems, USSD applications, SMSC integrations, SIP infrastructure — directly into the core networks of major operators. We have now extended that deep foundation into AI-powered voice: intelligent IVRs, voice bots, and AI call centre agents built for real environments.
The Distinction That Matters
Building for telecom operators is categorically different from building regular software. You are not just integrating an API – you are working with the core network infrastructure that millions of subscribers depend on. A misconfigured SMSC gateway does not slow an app – it causes a service outage for an entire subscriber base.
Stacknize has operated in this domain for over 14 years. We have built Ring-Back Tone platforms
integrated with Intelligent Network nodes. We have built USSD applications running MAP protocol
directly against the HLR. We have built custom CRM systems managing the full VAS subscriber lifecycle
for telecom operators. And we have now taken that protocol-level depth into a new frontier: AI voice
applications. Because the engineering discipline that makes a reliable USSD session manager – low latency, stateful, fault-tolerant – is exactly what makes a great AI voice agent.
Years of
Platform Engineering
Platform Engineering
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Projects Delivered
Across Countries
Across Countries
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Deployed in Production
Our RBT platform is live with one of the largest telecom operators in East Africa - SIP and SMSC integrated into their core network, managing the full VAS subscriber lifecycle through our custom-built CRM.
What We Do
Not services we offer — platforms we have engineered, deployed, and watched run in
production for real clients across three continents.
Ring-Back Tone (RBT) Platforms
- End-to-end RBT platform - SIP gateway integration, SMSC activation flows, USSD self-service menus
- Content management - upload, categorise, schedule, and promote audio tones
- Custom CRM - subscriber activations, renewals, deactivations, complaints, and VAS billing
USSD Applications
- Interactive session management via MAP protocol - at zero data cost to the subscriber
- Applications - balance enquiry, plan management, VAS activation, OTP, health service access
- Multi-language - menus for diverse subscriber bases
SMSC & Messaging
- SMPP v3.4 integration - transactional SMS, promotional campaigns, two-way messaging
- Delivery reporting, retry logic, and failure alerting at scale
SIP & VoIP Infrastructure
- SIP server deployment - at zero data cost to the subscriber
- Traditional and AI-powered IVR for subscriber self-service
AI-Powered Voice Applications
- Natural language IVR - replace rigid DTMF menus with LLM-driven voice interaction
- AI voice bots running over real SIP infrastructure not a web widget
- Real-time STT pipeline (Whisper), LLM dialogue management, TTS response synthesis
How We Work
Five engineering capabilities, each built over years of real production experience — not
assembled from a services catalogue.
01
Discovery & Architecture
We begin with a deep technical discovery — understanding your existing stack, traffic patterns, failure modes, and 12-month product roadmap. Architecture decisions are made here, not mid-build.
02
Build
Iterative development in 2-week sprints with working software delivered continuously. Every build decision is documented so your in-house team inherits a system they can understand and extend.
03
Evolve
Platform engineering does not end at launch. We offer structured ongoing engagement – from quarterly architecture
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
- MAP protocol
- Session management
IN / CAMEL
- Intelligent Network - real-time charging and service control
AI Voice
- OpenAI Whisper (STT) · ElevenLabs / Azure TTS · GPT-4o dialogue
Frontend & Admin
- Angular - operator CRM and management portal
Backend
- Node.js
- Java Spring Boot
- Python
Infrastructure
- AWS
- Docker
- on-premise for network-adjacent deployments
Who This is For
- Telecom operators launching or upgrading VAS platforms - RBT, USSD, messaging
- Operators extending existing network infrastructure with AI voice capabilities
- MVNOs needing VAS infrastructure without a full internal engineering team
- Enterprises with high inbound call volumes exploring AI voice automation
Our Partner for
Software Innovation
Looking for an Engineering Partner Who Actually Understands Telecom?
Few companies operate with confidence at the protocol level of telecom networks. Whether
building VAS or exploring AI voice — let’s have a technical conversation.