What does CelloIP Technologies do?
CelloIP Technologies is a full-service VoIP, WebRTC, AI, and custom software development company based in Ahmedabad, India, serving clients globally since 2017. We build custom Asterisk, FreeSWITCH, OpenSIPS, and Kamailio solutions, mobile SIP dialers for iOS and Android, WebRTC browser-based communication applications, IP PBX systems, call center platforms, and AI-powered communication software. Our team has delivered 150+ communication technology projects for 100+ clients across 30+ countries.
Voice Bot and Voice AI Agent Development
CelloIP is an expert in building AI voice bots and voice AI agents using LiveKit Agents SDK, VAPI, and Retell AI. We build end-to-end STT→LLM→TTS pipelines with Deepgram, GPT-4o, Claude, Whisper ASR, ElevenLabs, and Cartesia. Our voice agents handle inbound and outbound phone calls via SIP trunk integration with Asterisk and FreeSWITCH, deliver sub-500ms response latency, and support multilingual deployments. Use cases include AI customer service bots, appointment scheduling, collections automation, and intelligent IVR replacement.
Custom Software Development Expertise
CelloIP builds full-stack custom software using React.js, Next.js 15 App Router, NestJS, Node.js, Express, Python, and FastAPI backends. Our mobile app team delivers Flutter, React Native, Swift (iOS), and Kotlin (Android) applications — including VoIP dialer apps with CallKit, PJSIP, and ConnectionService integration. We also provide DevOps services including Kubernetes orchestration, CI/CD pipeline engineering, Docker containerisation, Terraform IaC, and multi-cloud deployments on AWS, GCP, and Azure.
Who should hire CelloIP Technologies?
Businesses looking to build or scale VoIP platforms, WebRTC communication tools, AI voice bots, mobile SIP dialers, contact centre software, or custom web and mobile applications should hire CelloIP Technologies. We serve telecom carriers, healthcare companies, fintech firms, SaaS startups, real estate agencies, call centres, and education platforms worldwide. Pricing depends on the role, seniority and engagement length — share your requirements and we will send a tailored proposal.
Custom Voice AI, VoIP & WebRTC Development
Custom VoIP platforms, WebRTC applications, mobile SIP dialers, and AI-powered telecom software — engineered by specialists, not generalists. Asterisk · FreeSWITCH · OpenSIPS · Kamailio.
Our Core Technology Stack
Quick answer
What does CelloIP Technologies do?
CelloIP Technologies builds custom Voice AI agents, AI voicebots and chatbots, VoIP and PBX platforms, contact-centre software and WebRTC applications on real telephony such as Asterisk, FreeSWITCH, OpenSIPS, Kamailio and LiveKit, in any language. Founded in 2017 in Ahmedabad, India, its 30+ engineers have delivered 150+ projects for clients in 30+ countries, and clients own the code.
End-to-End Communication Technology
From carrier-grade SIP infrastructure to consumer mobile dialers — we cover every layer of modern communication technology.
VoIP Platform Development
Custom SIP servers, softswitches, IP PBX systems, and unified communication platforms built on Asterisk, FreeSWITCH, OpenSIPS, and Kamailio.
WebRTC Development
Browser-based voice/video calling, click-to-call widgets, WebRTC gateways, and real-time communication applications without plugins.
Mobile SIP Dialer
White-label iOS and Android SIP softphone apps with HD voice, video calling, push notifications, SRTP encryption, and custom branding.
Call Center Software
Full-featured ACD, IVR, predictive dialer, supervisor dashboards, and omnichannel contact center platforms with CRM integrations.
AI-Powered VoIP
LLM-powered conversational IVR, real-time call transcription, sentiment analysis, AI agent assist, and automated CRM note generation.
OpenSIPS & Kamailio
Enterprise SIP proxies, session border controllers, load balancers, presence servers, and carrier-grade SIP routing infrastructure.
Custom Software Development
React, Next.js, Node.js, Flutter, and React Native applications designed to work alongside or integrate with your communication stack.
Cloud & DevOps for VoIP
Kubernetes orchestration, CI/CD pipelines, high-availability VoIP deployments on AWS, GCP, or your private infrastructure.
The Specialist Advantage in VoIP Development
When enterprise communication software fails, business stops. That's why our clients choose specialists over generalists — every time.
Deep VoIP/WebRTC Specialisation
We are not a generalist software shop. Every engineer on our team has been working with SIP, RTP, WebRTC, and telecom protocols for years — not months.
Full-Stack Telecom Ownership
From SIP stack internals to React dashboards to iOS/Android apps — one team owns every layer. No blame-shifting between vendors.
Transparent Partnership Model
Clear contracts, signed NDA on Day 1, full IP ownership transferred to you. We work as your extended engineering team — not a black-box vendor.
Open-Source Foundation
We build on Asterisk, FreeSWITCH, OpenSIPS, and Kamailio — battle-tested, community-supported platforms used by tier-1 carriers globally. No proprietary lock-in.
24x7 Support & SLAs
Production VoIP systems cannot have 9-to-5 support. Our support contracts cover round-the-clock response with defined SLA tiers for critical and non-critical issues.
AI-Native for 2026 & Beyond
We integrate LLM-powered IVRs, real-time transcription, sentiment analysis, and AI call analytics directly into VoIP infrastructure — positioning your product ahead of the competition.
CelloIP delivered our multi-tenant IP PBX in 14 weeks — on spec, on time, and with documentation that let our in-house team maintain it confidently. That kind of VoIP depth is genuinely rare.
Built With the Right Tools
We use battle-tested open-source platforms and modern frameworks — proven at scale by global telecoms, startups, and enterprises.
VoIP Platforms
- Asteriskv16–21
- FreeSWITCHv1.10+
- OpenSIPSv3.x
- Kamailiov5.x
- FusionPBXv5+
- FreePBXv16/17
Mobile & SIP
- PJSIPv2.x
- Linphone SDKv5.x
- Flutterv3
- React Nativev0.73+
- Swift (iOS)v5+
- Kotlin (Android)v1.9+
Web & Backend
- Next.jsv14/15
- Reactv18/19
- Node.jsv20 LTS
- NestJSv10
- WebRTCW3C Std
- WebSocketRFC 6455
AI / Integrations
- OpenAI APIGPT-4o
- Deepgram STTv3
- Whisperv3
- DialogflowCX
- SalesforceAPI v58
- HubSpotv3 API
DevOps & Cloud
- Kubernetesv1.29+
- Dockerv25
- AWSEC2/ECS/EKS
- GitHub ActionsCI/CD
- Prometheusv2.x
- PostgreSQLv16
All platforms and versions kept current — we stay ahead of deprecation cycles and security advisories.
How We Deliver Zero-Surprise Projects
A repeatable, transparent process refined across 500+ communication technology projects.
Discovery & Requirements
We start with a deep-dive technical discovery call to understand your infrastructure, use cases, integration requirements, and growth targets. You leave with a clear scope document.
Architecture & Design
Our senior architects design the system: SIP topology, codec selection, failover strategy, database schema, API contracts, and UI wireframes. We challenge assumptions early — not mid-build.
Iterative Development
Development in 2-week sprints with working demos at the end of each sprint. You see real progress — not a 3-month blackout. Feature branches, code reviews, and automated testing at every merge.
QA & Performance Testing
Load testing under realistic concurrent call volumes. SIP conformance testing. Cross-device testing for mobile apps. Security review for SRTP, TLS, and authentication flows.
Deployment & Go-Live
Production deployment to your infrastructure or cloud. DNS cutover, monitoring setup (Prometheus, Grafana), health checks, and go-live support with your team present.
Ongoing Support & Growth
Monthly retainer or per-incident support contracts. We proactively monitor your system, apply security patches, and help you scale as call volumes grow.
Communication Software Across Every Sector
Each industry has unique compliance requirements, use cases, and buyer journeys. We tailor every engagement to your sector.
Telecom & Carriers
MNOs, MVNOs, CLECs, ISPs — carrier-grade SIP routing, billing, and UCaaS platforms.
Healthcare
Secure telemedicine, WebRTC video consultations, and care coordination platforms.
Fintech
Voice AI for banks and lenders, call recording that keeps card details out, and secure client communication.
Real Estate
AI voice agents that call new leads back in seconds, qualify them and book viewings in your CRM.
Education
Virtual classroom WebRTC, interactive tutoring platforms, and LMS-integrated communication.
E-Commerce
AI voice agents for order status, returns and COD confirmation, plus click-to-call and support contact centres.
Logistics
Dispatch communication systems, driver apps with push-to-talk, and delivery notification calls.
SaaS Products
Calling, video and voice AI built into your product, on a communication layer you own instead of renting per minute.
Hire Dedicated Developers
Pre-vetted VoIP, AI & full-stack specialists — quoted per engagement
VoIP & AI Engineering Blog
Deep-dive guides on Asterisk, FreeSWITCH, LiveKit, WebRTC & voice AI
Building AI Voice Agents with LiveKit: Complete 2026 Guide
LiveKit + Asterisk & FreeSWITCH Integration Guide 2026
Voice Bot Development: Complete 2026 Guide (STT, LLM, TTS)
WebRTC to SIP Gateway Architecture
FreeSWITCH vs Asterisk in 2026: Which Platform to Choose?
Custom VoIP Development Company: How to Choose the Right Partner
WebRTC Developments in 2026: What's New Right Now
Building an AI Contact Center with FreeSWITCH & OpenAI Realtime API
Ready to Build Your Communication Platform?
Talk to a VoIP specialist today. We'll review your requirements, suggest an architecture, and send a no-obligation proposal within a week.
We respond to all enquiries within one business day · Available Mon–Sat, 9am–7pm IST
Explore CelloIP Technologies