Build VoIP Business Platform + API Build (Kamailio/FS Custom Development)

@OutsourceMan

With a comprehensive understanding of the entire technology stack you're targeting for your VoIP Business Platform, my team at CnELIndia is perfectly poised to handle this project with utmost professionalism. Our expertise in Kamailio, FreeSWITCH, and SIP, honed during our 18 years in the industry, positions us as trusted advisors on all things telephony. We take pride in not just taking up projects but envisaging their impact on businesses and developers alike. Given that you are looking for a CPaaS platform, we'll not just build a voice infrastructure but equip it with customer portals, developer APIs, and SDKs for enhanced usability. By using Kamailio and FreeSWITCH to their maximum abilities, we will render a voice service that is secure, scalable, and enterprise-grade. Lastly, I'd like to emphasize our passion for innovation which makes us a compelling choice. We've delivered on complex web application projects similar to yours always ensuring optimal quality within stipulated budgets and timeframes; as proven by the adoration from our extensive and satisfied client base. Putting our proficiency at your disposal would be our privilege and we assure you of an impeccable delivery.

@ykarora26

Hello there, I am thrilled to submit my proposal for your project seeking an experienced developer with expertise in SIP, Kamailio, FS, and other telephony environments to build a custom CPaaS platform. I have a solid background in developing voice infrastructure layers, customer portals, developer APIs, and SDKs to empower businesses and developers in creating voice-enabled applications and managing telephony services. I am confident in utilizing Kamailio as the SIP proxy/SBC, FreeSWITCH as the media server, and modern web application technologies to deliver scalable, secure, and enterprise-grade voice solutions for your project. Regards, ykarora26

@mahig47

Hello! As per your project post, you’re looking to build a VoIP business platform and CPaaS system using Kamailio and FreeSWITCH that provides a complete voice infrastructure layer, customer portal, developer APIs, and SDKs for businesses to build and manage telephony services. The goal is to create a scalable and secure enterprise grade voice platform that enables SIP routing, call management, and API driven voice applications. My focus will be on delivering a robust CPaaS platform, featuring: Kamailio based SIP proxy and SBC configuration, FreeSWITCH media server setup for call routing and voice processing, customer portal for telephony management, developer friendly REST APIs and SDK structure, real time call monitoring and analytics, multi tenant account management, and secure scalable web dashboard with billing and service controls. I specialize in building scalable backend systems and API driven platforms using Node.js or Python, cloud infrastructure, real time communication systems, and secure web dashboards with strong focus on performance, reliability, and modular architecture. My focus will be on creating a stable CPaaS infrastructure that supports SIP environments, developer integrations, and long term scaling. Let’s connect to review SIP architecture, API scope, and deployment strategy so we can finalize the development roadmap and infrastructure planning. Best regards, Nikita Gupta.

@ixorawebmob

Hello, I’ve gone through your project details and this is something I can definitely help you with. I have 10+ years of experience in mobile and web app development, specializing in VoIP systems using Kamailio and FreeSWITCH. My focus is on creating scalable, secure applications that empower businesses to leverage voice technology effectively. I understand the complexities involved in building a CPaaS platform and the importance of a robust infrastructure to manage telephony services. I will first review your requirements, suggest the best technical approach, and then proceed with development while keeping you updated at every stage. Here is my portfolio: https://www.freelancer.in/u/ixorawebmob I’m interested in your project and would love to understand more details to ensure the best approach. Could you clarify: 1. What specific features do you envision for the customer portal? 2. Will there be third-party services or APIs to integrate? 3. Do you have a timeline for the project milestones? 4. Are there any reference platforms you admire? Let’s discuss over chat! What specific features do you envision for the customer portal? Regards, Arpit Jaiswal

@NEHABHAT92

With your emphasis on experience in SIP, Kamailio, FS, and other telephony environments, I'm ecstatic to let you know my team and I have a robust understanding of these platforms. Over the past decade in web and mobile development, we have brushed shoulders with advanced communications development, and our proficiency can be leveraged for efficiency in your project. Leveraging Kamailio as the SIP proxy/SBC along with FreeSWITCH as the media server is a combination we are familiar with, which means reduced learning curves and faster time to deployment for you. Our extensive knowledge of Node.js further amplifies our suitability for this task as it has been proven to deliver highly scalable and robust systems - an essential requirement for any enterprise-grade voice infrastructure. In addition to this expertise, there are extra benefits that come with choosing us: our effective cost of project, commitment to cross-browser compatibility, free three months support after delivery, and affordable domain and hosting options. So if you're looking for not just top-notch skills but also accountability and efficiency combined at an excellent value proposition - look no further. Let us bring your telephony aspirations to life!

@mubeenm5026

With over a decade of experience in the field, my team and I at Web Crest have honed our skills to expert levels. From Command Line Tools to Incident Management, we've got thorough knowledge and implementation chops in various fields including SIP, Kamilio, FS, and CPaaS platforms. This experience makes us your ideal choice for building a robust VoIP platform that can handle your telephony services effortlessly. Our proficiency with Kamailio as the SIP proxy and FreeSWITCH as the media server align with your project requirements perfectly. We are well-acquainted with the inner workings of these systems and can exploit their full potential to deliver a scalable, secure, and state-of-the-art voice infrastructure layer. Additionally, our command over modern web application stacks further enhances our ability to create an enterprise-grade system. What sets us apart from others is not just our technical acumen but also our approach to projects - we seek long-term partnerships by providing scalable solutions that grow with your business. With transparent communication, efficient workflow management, and a completion rate of 98%, you can trust us to deliver a top-notch job. Let Web Crest be your comprehensive solution provider for this CPaaS project - contact us today and let's discuss how we can transform your vision into reality!

@amaank66

Hello, Your requirement for a full-scale CPaaS platform aligns with my experience in building telecom-grade systems using SIP, Kamailio, and FreeSWITCH. I can design a scalable architecture where Kamailio handles SIP routing, load balancing, and SBC functions, while FreeSWITCH manages media processing, call control, and advanced voice features. On top of this, I’ll build a robust web layer (Node.js/NestJS + React) to power your customer portal, APIs, and SDK ecosystem. Core Capabilities: • SIP routing, failover, and multi-tenant handling via Kamailio • Call control, IVR, recording, conferencing via FreeSWITCH • RESTful APIs & Webhooks for developers • Customer portal for number management, usage, billing & analytics • Authentication, rate limiting, and secure token-based access • Scalable deployment on AWS with monitoring & logging Platform Highlights: • Enterprise-grade reliability and horizontal scalability • Clean API-first architecture for easy integrations • Modular SDK support for faster developer adoption I focus on building telecom systems that are stable, secure, and ready for real-world traffic. Happy to discuss architecture and share relevant experience. Best regards, Amaan Khan P. CUBEMOONS PVT LTD.

@techsty2014

Interesting project, I will build your CPaaS platform with Kamailio for SIP routing and SBC, FreeSWITCH as the media server, a customer portal for managing numbers and call flows, and REST APIs with SDKs for voice-enabled app integration. The web layer will run on Node.js with a modern frontend. For architecture, I will keep Kamailio and FreeSWITCH loosely coupled through an event bus — this lets you scale media processing independently from SIP routing as concurrent call volume grows. CDRs and billing events will flow through the same bus into analytics and invoicing. Questions: 1) Do you have carrier SIP trunks, or does the platform need BYOC (bring your own carrier) from day one? 2) Which SDK languages are priority — JavaScript, Python, or others? 3) Is WebRTC browser calling part of the MVP scope? Looking forward to discussing further. Best regards, Faizan

@kishanbwts

I’ve built custom CPaaS platforms before using Kamailio and FreeSWITCH, including SIP proxies and media servers that handled voice routing and call control for scalable business use. For your project, I’d focus first on designing a flexible SIP routing layer in Kamailio to support multi-tenant voice traffic with security and failover in mind. On the FreeSWITCH side, I’ll ensure media handling is optimized for quality and resource efficiency. For the customer portal and APIs, I recommend RESTful designs with OAuth for secure access and clear developer documentation to speed up adoption. Do you have specific call flows or telephony features you want prioritized? Also, should the APIs support real-time event notifications or just REST control? These details will help shape the architecture quickly. I’m ready to map out the platform components and get development started right away.

@PrateekP3003

Hello! According to your project description, you are looking to build a custom CPaaS (Communications Platform as a Service) platform featuring a full voice infrastructure layer, a customer portal, developer APIs, and SDKs. The platform will enable businesses and developers to build voice-enabled applications and manage telephony services. My focus lies in developing scalable and secure telephony platforms using Kamailio as the SIP proxy/SBC, FreeSWITCH as the media server, and modern web stacks for enterprise-grade applications. I can deliver fully functional SIP/VoIP infrastructure, integrated customer portals, developer APIs, and SDKs, ensuring robust call routing, media handling, and management workflows. I specialize in building CPaaS and VoIP solutions with high reliability, real-time voice handling, and clean API design. I can provide well-documented source code, deployment guidance, and a secure, scalable platform ready for commercial use. Let's connect to discuss your preferred features, integrations, and timelines so we can build a fully functional and enterprise-ready voice platform. Sincerely, prateek

@Mayanks010

Hi there, You’re absolutely in the RIGHT PLACE. I’ve delivered SIMILAR PROJECTS multiple times and know EXACTLY how to execute this efficiently and correctly from day one. To lock down the SCOPE, TIMELINE, AND PRICING, I’ll need to ask you a few key questions. Unfortunately, Freelancer’s 1500 CHARACTER LIMIT doesn’t allow me to break everything down properly here. Let’s jump on CHAT so I can show you my PROVEN PAST WORK, walk you through the REAL RESULTS I’ve delivered, and outline a CLEAR ACTION PLAN for your project. You’ll immediately see why my approach is DIFFERENT and EFFECTIVE. If you’re serious about getting this done RIGHT, I’m ready to move forward. Looking forward to CONNECTING and WINNING TOGETHER. Cheers, Mayank Sahu

@SurbhiElectronet

Hi, Before we proceed, I’d like to understand whether you already have any existing SIP infrastructure or everything needs to be built from scratch, and do you have specific requirements around multi-tenant architecture and billing within the CPaaS platform? I understand you’re looking to build a full-scale VoIP platform using Kamailio and FreeSWITCH with APIs, SDKs, and a business-ready customer portal. This requires careful design of signaling, media handling, scalability, and API architecture to ensure performance and reliability at scale. I can help you structure and develop this as a scalable CPaaS solution with proper separation of SIP routing, media processing, and backend services, along with secure APIs and a clean web interface for management and integration. My focus will be on building a production-ready system that is stable, extensible, and aligned with enterprise-level communication platforms. Let’s connect and discuss the architecture and execution plan in detail.

@abdf2010

Hi there, I've taken a close look at your project to build a VoIP business platform with a custom API using Kamailio and FreeSWITCH. It's clear that you're looking for a comprehensive solution that provides a voice infrastructure layer, customer portal, and APIs for developers to build voice-enabled applications. With my background in VoIP development, including experience with SIP, Kamailio, and FreeSWITCH, I'm confident I can help you achieve your goals. My experience with Node.js, backend and frontend development, and documentation will also come in handy as we work on building a robust and scalable platform. I'm intrigued by the opportunity to work on a project that involves building a custom CPaaS platform, and I think my skills align well with your requirements. Let's discuss the project further, and I can walk you through my approach to building the platform, including how I'd use Kamailio as the SIP proxy and FreeSWITCH as the media server. How about we schedule a call to explore the details and see if we're a good fit for this project?

@mobasherreza10

Hi there, I noticed you need an experienced developer to build a custom CPaaS platform using Kamailio as the SIP proxy/SBC, FreeSWITCH as the media server, and a modern web stack to deliver a complete voice infrastructure layer, customer portal, developer APIs, and SDKs. I have extensive experience in telephony and real‑time communication systems, including recent work where I architected and deployed a scalable voice platform for a client using Kamailio for routing and load balancing, FreeSWITCH for media handling, and a Node.js + React portal for customer management, complete with REST APIs and SDK documentation for developers. I am comfortable with Kamailio configuration (routing, authentication, dispatcher, load balancing), FreeSWITCH dialplan, mod_sofia, and event socket integration, as well as building secure, multitenant web applications. Let's discuss your scalability requirements, expected call volumes, and whether you need support for SMS or video in addition to voice. Best regards, Mobasher Reza

@murtuza90

Hi, I have carefully reviewed your job description and understand that you require a custom CPaaS platform built using SIP, Kamailio (SBC), and FreeSWITCH (media server), along with developer APIs, SDKs, and a scalable voice infrastructure. With 12+ years of development experience, we bring strong expertise in VoIP architecture, SIP signaling, Kamailio, FreeSWITCH, WebRTC, Node.js/Python, REST APIs, microservices, cloud deployment, and security best practices. We understand the key challenges around real-time performance, scalability, and secure communication, and have a structured, production-ready approach to solve them. Estimated Timeline: 6–8 weeks for MVP delivery I will personally oversee the project with my team, ensuring full transparency, proactive communication, and on-time delivery. I’ve also prepared a high-level execution plan for your platform would love to walk you through it. Let’s connect and discuss how we can bring this to production smoothly and efficiently. Best, Murtuza

@KarthikTechCon

Hi, I’m Karthik with 15+ years of experience in **telecom platforms, VoIP systems, and scalable backend architectures**. I can help build your **CPaaS voice platform** using **Kamailio (SIP proxy/SBC) + FreeSWITCH (media server)** with a secure, enterprise-grade web layer and developer APIs. **What I’ll deliver:** ✔ SIP infrastructure (routing, registration, load balancing, failover) ✔ FreeSWITCH setup (call control, media handling, IVR, recording) ✔ Scalable CPaaS backend (REST APIs, auth, billing-ready structure) ✔ Customer portal (DIDs, usage, call logs, configs) ✔ Developer APIs + SDK-ready endpoints ✔ Secure, high-availability architecture **Key Capabilities:** • SIP trunking, NAT traversal, RTP handling • Real-time call events via WebSockets • Multi-tenant architecture for businesses • Integration-ready APIs for apps & external systems **Relevant Experience:** • VoIP platforms with Kamailio/FreeSWITCH • Real-time communication systems (voice & messaging) • API-driven SaaS platforms **Approach:** ✔ Modular, scalable design ✔ Performance + security first ✔ Clean documentation for APIs & deployment **Deliverables:** • Full platform (infra + backend + portal) • API documentation (Swagger/Postman) • Deployment & setup guide **Timeline:** 4–6 weeks (phase-wise) Let’s build a robust CPaaS platform ready for scale. Warm Regards, Karthik B Resonite Tech