Build VoIP-Powered Mobile Apps
We develop mobile apps with built-in SIP calling, video conferencing, and unified communications - or integrate VoIP into your existing apps across any industry.
E-commerce, EdTech, Healthcare, ERP, Logistics, Marketplace - if it runs on a phone, we can make it talk.
Incoming Call
Sales Team
Communication Apps We Build
From contact center mobile apps to unified communications platforms - we build every type of VoIP-enabled mobile application with carrier-grade call quality.
Contact Center Mobile App
Full-featured mobile contact center apps with WebRTC softphone, real-time agent dashboard, call controls, CRM screen pops, disposition management, and push notification alerts for incoming calls.
IP PBX & UC Mobile App
Enterprise unified communications mobile apps with SIP calling, video conferencing, instant messaging, presence management, voicemail, and seamless desk-to-mobile call handoff.
Video Calling & Conferencing App
Scalable video meeting apps with screen sharing, recording, virtual backgrounds, breakout rooms, whiteboard collaboration, and support for 500+ participants per session.
CPaaS & Communication SDK
Embeddable communication SDKs and APIs for mobile apps. Add voice calling, video, SMS, and chat to any existing application with just a few lines of code integration.
Integrate VoIP Into Any Mobile App
We drop SIP calling and video communication into any existing mobile application - regardless of industry, technology stack, or business vertical. If your app needs voice, we make it happen.
E-Commerce & Marketplace
Integrate click-to-call, in-app voice support, and video product consultations directly into shopping apps. Enable buyers and sellers to communicate seamlessly without leaving the platform.
EdTech & E-Learning
Build virtual classroom apps with live audio/video calling, screen sharing, recording, and interactive Q&A sessions. Enable one-on-one tutoring and group lectures with crystal-clear VoIP quality.
ERP & Manufacturing
Add real-time voice communication to ERP systems and factory floor apps. Enable shop floor-to-office calling, supplier video calls, and automated voice alerts for production events.
Logistics & Fleet Management
Integrate VoIP into fleet tracking and logistics apps. Enable dispatchers to call drivers, automated delivery status calls to customers, and real-time voice coordination across the supply chain.
Healthcare & Telemedicine
HIPAA-compliant voice and video calling for telemedicine apps. Enable doctor-patient video consultations, appointment reminder calls, prescription voice notes, and emergency hotline integration.
FinTech & Banking
Secure voice verification, in-app customer support calls, and video KYC integration for banking and financial apps. End-to-end encrypted calling with compliance-ready audit trails.
Grocery & Food Delivery
Enable rider-customer and rider-support voice calls within delivery apps. Masked calling for privacy, automated order confirmation calls, and real-time voice support for delivery issues.
SaaS & Licensed Products
Add voice and video communication to any existing SaaS platform or licensed software. Whether it is a CRM, project management tool, or HR platform - we embed calling functionality seamlessly.
We Build Any Mobile App
VoIP is our superpower, but we are a full-service mobile development company. From e-commerce to fleet management, we build production-grade apps for every business need.
E-Commerce Apps
Full-featured shopping apps with product catalog, cart, payment gateway, order tracking, push notifications, and integrated voice/video customer support.
Marketplace Apps
Multi-vendor marketplace platforms with seller dashboards, buyer profiles, in-app messaging, review systems, and commission management.
App Clones & Replicas
Pixel-perfect clones of popular apps (Uber, WhatsApp, Zoom, Airbnb) with custom branding, features, and your own backend infrastructure.
Grocery & Delivery Apps
On-demand delivery apps with real-time tracking, route optimization, driver management, in-app payments, and voice-enabled support.
Fleet Management Apps
GPS tracking, route planning, driver communication, vehicle maintenance alerts, fuel management, and dispatch coordination tools.
Healthcare Apps
Patient portals, telemedicine, appointment booking, health record management, prescription tracking, and HIPAA-compliant video consultations.
Case Studies
Real projects, real results. See how we integrated VoIP into existing apps and the measurable impact it created for our clients.
GlobalTrade Marketplace
E-Commerce & MarketplaceThe Challenge
GlobalTrade, a B2B marketplace connecting 2,000 suppliers with buyers across 8 countries, relied on external calling apps and email for buyer-seller communication. This caused fragmented conversations, lost context, and a 4.2-day average response time for purchase inquiries.
Our Solution
We integrated SIP-based voice and video calling directly into their existing React Native marketplace app. Buyers can now tap a supplier listing and instantly initiate a VoIP call - no phone number needed. We added call recording for dispute resolution, automated call summaries using AI transcription, and a complete call history tied to each transaction.
Technologies Used
Measurable Results
Response Time
Deal Closure Rate
Support Tickets
User Satisfaction
Adding in-app calling transformed how our buyers and sellers communicate. The integration was seamless, and the impact on deal closures was immediate.
Marcus Chen
CTO, GlobalTrade Marketplace
MediConnect Health
Healthcare & TelemedicineThe Challenge
MediConnect had a patient management app with 8,000 active users but all consultations required patients to visit clinics in person. During the telemedicine surge, they needed HIPAA-compliant video calling, appointment-based auto-dialing, prescription voice notes, and emergency hotline integration - all within their existing Flutter app.
Our Solution
We built a complete telemedicine module within their existing Flutter application. Doctors can now conduct video consultations with screen sharing for lab reports, record voice prescriptions, and send automated appointment reminder calls. We integrated FreeSWITCH as the backend telephony engine with TLS/SRTP encryption for HIPAA compliance and built a custom queue system for emergency calls.
Technologies Used
Measurable Results
Consultations/Day
Patient Wait Time
No-Show Rate
Revenue per Doctor
AnrizVoIP transformed our patient app into a full telemedicine platform in just 10 weeks. The call quality is excellent and the HIPAA compliance gave us peace of mind.
Dr. Sarah Mitchell
Chief Medical Officer, MediConnect Health
What Our Clients Say
Hear from businesses across industries who trusted us to build and integrate VoIP into their mobile applications.
“We needed VoIP calling inside our logistics app for driver-dispatcher communication. AnrizVoIP delivered a flawless solution with push notifications and background calling. Our dispatch efficiency improved dramatically.”
James Rodriguez
VP of Engineering, SwiftFleet Logistics
“The team integrated SIP calling into our ERP mobile app in just 6 weeks. Now our factory floor supervisors can call the head office directly from the production dashboard. Game changer for our operations.”
Anita Gupta
Director of IT, Precision Manufacturing Co.
“We hired AnrizVoIP to build a Zoom-like video conferencing app for our education platform. The quality, features, and reliability exceeded our expectations. Their VoIP expertise is unmatched.”
David Park
Founder & CEO, LearnSpace EdTech
“Our grocery delivery app needed masked calling between riders and customers. AnrizVoIP implemented it with number masking, call recording, and analytics - all integrated into our existing React Native app.”
Fatima Al-Hassan
Product Lead, FreshCart Delivery
“AnrizVoIP cloned and customized a WhatsApp-like messaging app for our internal team communication. Voice calls, video, file sharing, channels - everything works perfectly. Their mobile dev skills are top-tier.”
Robert Kline
CTO, NexGen Solutions
“We wanted to add click-to-call to our e-commerce app so customers could reach sellers instantly. The integration was smooth, and our seller response rate jumped by 60% in the first month.”
Lisa Chang
Head of Product, MarketBridge Asia
Technologies We Work With
From cross-platform mobile frameworks to carrier-grade telephony engines - our stack covers everything you need for a production VoIP app.
Mobile Frameworks
VoIP & Real-Time
Backend & APIs
Telephony Engines
Cloud & DevOps
Database & Storage
App Development Process
A structured, transparent process from discovery to App Store launch. Every phase includes client demos and feedback loops.
Discovery & Strategy
We analyze your business model, target users, existing systems, and communication requirements. We define the app scope, user journeys, and integration architecture.
UI/UX Design & Prototyping
Our design team creates pixel-perfect wireframes, interactive prototypes, and a complete design system. You review and approve on real devices before development begins.
Agile Development
We build your app in 2-week sprints with continuous demos. VoIP/SIP integration, UI development, backend APIs, and testing happen in parallel workstreams.
VoIP Integration & Testing
Deep integration of SIP calling, WebRTC, push notifications (PushKit/CallKit), call quality optimization, codec tuning, and network condition handling for flawless voice/video.
QA, Security & Performance
Comprehensive testing across 50+ devices, security audits, penetration testing, load testing with concurrent calls, and app store compliance verification.
Launch & Post-Launch Support
App Store and Play Store submission, phased rollout, crash monitoring, performance analytics, and ongoing feature development. Your app keeps evolving after launch.
Why Build Your App With Us
We combine deep VoIP protocol expertise with world-class mobile development. That combination is extremely rare.
VoIP + Mobile DNA
We are not just mobile developers who learned VoIP. We are VoIP engineers who build mobile apps. AnrizVoIP is our own product - we understand SIP, RTP, and WebRTC at the protocol level.
Cross-Platform Mastery
React Native, Flutter, Swift, Kotlin - we build for every platform. One codebase or native, your choice. Every app ships with PushKit/CallKit and native call handling.
Integrate Into Anything
Existing e-commerce app? ERP system? Healthcare platform? We drop VoIP calling into any existing mobile application without disrupting your current architecture.
Enterprise Security
TLS/SRTP encryption, OWASP compliance, HIPAA-ready architecture, biometric authentication, and end-to-end encryption for voice and video calls.
Global Call Quality
Adaptive codecs, OWASP mobile security, jitter buffers, echo cancellation, and intelligent network switching (WiFi/4G/5G) ensure crystal-clear calls worldwide.
Full Source Code Ownership
You own 100% of the source code, design assets, and intellectual property. No vendor lock-in. Deploy on your own infrastructure and app store accounts.
How to Work With Us
Choose the model that fits your timeline, budget, and team structure.
Fixed-Price App
Defined Scope & BudgetBest for well-defined apps with clear requirements. Fixed timeline, fixed budget, and guaranteed deliverables with milestone-based payments.
Dedicated App Team
Your Extended Mobile R&DA full mobile development team - designers, developers, QA, and VoIP engineers - working exclusively on your product. Scale up or down as needed.
MVP Development
Launch in 8-12 WeeksGet your app to market fast with core features, validate with real users, then iterate. Perfect for startups and new product lines.
One Team. Every Platform.
iOS, Android, Web - we build for every screen. Cross-platform with React Native or Flutter, or native with Swift and Kotlin. Your choice.
Team Chat
Meeting at 3pm?
Sure, I will join via app
Great, starting video call
Active Call
Team Standup
4 participants
12:34
Call Analytics
Today's Calls
247
Avg Duration
4:32
Call Quality
4.5 MOS
Active Agents
18
Frequently Asked Questions
Common questions about our VoIP app development and mobile integration services.
Yes, this is one of our primary services. We integrate SIP-based voice calling, video calling, and messaging into existing React Native, Flutter, Swift, and Kotlin apps. The integration includes WebRTC for media handling, PushKit (iOS) and Firebase Cloud Messaging (Android) for incoming call notifications, and CallKit/ConnectionService for native call UI integration. We work with your existing codebase without disrupting your current functionality.
We work with all major mobile frameworks: React Native and Flutter for cross-platform development, Swift for native iOS, and Kotlin for native Android. For VoIP integration, we use WebRTC with SIP.js or custom SIP stacks. We recommend React Native or Flutter for most projects as they allow single-codebase deployment to both iOS and Android, reducing development time by 40%.
Absolutely. While VoIP is our specialty, we are a full-service mobile development company. We build e-commerce apps, marketplace platforms, grocery delivery apps, fleet management apps, healthcare apps, and even clone apps of popular platforms. Many clients start with a general app and later add VoIP functionality as their communication needs evolve.
We implement PushKit (VoIP push) on iOS and high-priority Firebase Cloud Messaging on Android. When an incoming call arrives, the system wakes your app and triggers the native call UI (CallKit on iOS, ConnectionService on Android) - exactly like a regular phone call. This works even when the app is completely killed, ensuring zero missed calls.
We optimize for real-world mobile conditions. Our implementation includes adaptive bitrate codecs (Opus), jitter buffering, packet loss concealment, echo cancellation, noise suppression, and intelligent network switching between WiFi, 4G, and 5G. Typical MOS (Mean Opinion Score) is 4.0-4.5 even on moderate mobile networks. We also implement call quality monitoring and automatic codec fallback.
An MVP with core VoIP functionality takes 8-12 weeks. A full-featured app with calling, video, messaging, user management, and admin dashboard takes 16-24 weeks. If you need VoIP integration into an existing app, the integration typically takes 4-8 weeks depending on the complexity of your current codebase.
Yes. For healthcare and regulated industries, we implement TLS/SRTP encryption for all voice and video calls, end-to-end encryption for messaging, HIPAA-compliant call recording storage, BAA (Business Associate Agreement) ready architecture, audit logging for all communication events, and data residency controls for GDPR compliance.
Yes. We build white-label VoIP and video calling apps that you can rebrand with your own logo, colors, and identity. The app can be published under your own developer accounts on both App Store and Play Store. We provide the complete source code and deployment documentation.
VoIP integration into an existing app starts from $8,000-$15,000. A new VoIP-enabled mobile app (iOS + Android) starts from $20,000-$40,000 for an MVP. Full-featured apps with admin panels, analytics, and advanced features range from $50,000-$120,000. Non-VoIP apps like e-commerce or marketplace platforms follow similar pricing. We provide detailed estimates after the discovery phase.
Yes. We offer ongoing support packages that include bug fixes, OS compatibility updates (new iOS/Android versions), feature enhancements, App Store/Play Store compliance updates, crash monitoring, and performance optimization. Most clients continue with us for long-term app evolution and feature releases.
Yes. Number masking (also called number anonymization) is a common feature we implement for marketplace and delivery apps. When a buyer calls a seller (or rider calls a customer), the call routes through our VoIP system using a proxy number, so neither party sees the other's real phone number. This protects user privacy while enabling seamless communication.
We primarily use FreeSWITCH for its scalability and multi-tenant capabilities, with Kamailio/OpenSIPS as SIP proxies for load balancing and routing. For simpler PBX-style apps, Asterisk is also an option. The mobile app connects via WebRTC (SIP over WebSocket) to these backend engines. We also integrate with cloud providers like Twilio and Telnyx for PSTN connectivity when needed.
Let's Build Your Next Mobile App
Whether you need a VoIP-powered contact center app, SIP integration into your existing platform, or a full mobile application from scratch - our team is ready.