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6.7
6.7
100%

HAFIZABAD, Pakistan
$70 USD (1시간 기준)
Over the last 5 years, I have developed a wide range of VOIP projects. Just a brief introductions of things i have worked on. [Opensips/Kamailio] 1. Developed local and International VoIP network (Termination/Origination) with, along redis as cache database and FreeRadius as AAA Sever. 2. Registrar in Type 5 switch with freeswitch as media server. 3. Opensips-CP/SIREMIS. 4. Symmetric Nat solutions with rtpengine/rtpproxy. [Freeswitch] 1. AutoDialer Supporting more that 5000 CC calls using Multiple freeswitch. 2. Voip network setup using mod_enum,mod_lcr,mod_nibblebill. 3. Freeswitch realtime implementation using lua/mod_xml_curl [Asterisk] 1. Asterisk realtime implementation. 2. AGI/AMI scripts.. 3. Autodialer using pycall. [Free-Dialers] 1. Newfies Dialer 2. IctDialer 3. ViciDialer [Zabbix / Monit] 1. Monitorig of different Servers 2. Setting triggers for different services 3. Generating e-mail notifications on triggers [Languages] 1. Lua 2. Golang

6.5
6.5
95%

New Delhi, India
$50 USD (1시간 기준)
We are Team iKcon Infotech!! Above 9 years of Expertise in VoIP Based Products. We majorly deal in below stated products and our focus in customer satisfaction which turns out to be automatic more references. That is the reason what from past years our Completion ratio is above 95% Open Source System * Forwarding Portal * A2Billing * ASTPP * Vicidial * FreePBX * FusionPBX * OpenSIP * Asterisk * Elastix * Forwarding Portal * GoAutodial * Freeswitch VoIP Mobile Dialer * Linphone Any kind of Customization or Development in VoIP Open Source Products. We have our own customized version of A2billing, ASTPP, Vicidial, FusionPBX and more. For more information about iKcon Infotech check our website.

4.1
4.1
94%

Santo Domingo Este, Dominican Republic
$36 USD (1시간 기준)
Experienced Computing Electronic Engineer and Unix-Like SysAdmin, also with turn-key VoIP based platforms (FreeSWITCH, Kazoo/2600hz, Kamailio, OpenSIPS, dSIPRouter). VPN (Wireguard, Zerotier and Strongswan). SignalWire Cloud LaML and Relay Programming (PHP, Python and NodeJS) Telnyx API

4.5
4.5
100%

Karnal, India
$25 USD (1시간 기준)
Expert in Network & Security technology. Cisco switch, Cisco router, Cisco ASA firewall, Cisco WLC, Check Point Firewall, F5 LoadbLncer Cisco network concept & troubleshooting. • Configuring and installing Cisco routers 76xx, 36xx, 26xx, 28xx, 18xx, 17xx and Switches 29xx, 37xx, 45xx, 65xx, 45xx, 49xx and Firewall ASA 5585, 5525, and 5508.p, palo alto firewall • Configuring open-source Access controllers for AAA services. • Configuring routers for establishing connectivity with ISP in area gateways. • Configuration and management of Routers and Switches (L2 & L3) • Installation, configuration & management of CISCO ASA Firewall in failover mode. • Applying various security policies and implementation & configuration of VPN Tunnels between firewall for different sites to connect. • Configuring and Implementing Gateway Redundancy, Gateway Load Balancing and Interface tracking using HSRP, VRRP and IP SLA.

9.4
9.4
95%

Mississauga, Canada
$25 USD (1시간 기준)
We are a Canadian-Ukrainian team of highly professional IT specialists (software developers, designers, system administrators and Internet marketers) with more than 20 years expertise. OUR MAIN SPECIALIZATIONS: 1) WEB DEVELOPMENT & SOFTWARE DEVELOPMENT 1.1) FRONT-END: HTML, HTML5, CSS3, Bootstrap, TailwindCSS 1.2) JAVASCRIPT: JavaScript, ES6+, Typescript, Node.js, MEAN, MERN, MEVN, Angular, React.js, Vue.js, Nuxt.js, Next.js, Gatsby.js, jQuery 1.3) BACK-END 1.3.1) LAMP (Linux, Apache, MySQL, PHP) including Symfony, Laravel, Yii, Zend, CodeIgniter, CakePHP 1.3.2) Python (Python, Django, Flask, FastAPI) 1.3.3) .NET stack technologies (C#, ASP.NET, .NET Core) 1.4) OPEN SOURCE SOLUTIONS 1.4.1) E-commerce Platforms: Shopify, Magento, WooCommerce, Prestashop, OpenCart, BigCommerce, Shopware, osCommerce 1.4.2) CMS: WordPress, Drupal, Joomla, TYPO3 etc. 1.4.3) CRM: SuiteCRM, SugarCRM 2) MOBILE DEVELOPMENT 2.1) Android native development: Java, Kotlin 2.2) iOS native development: Swift, Objective-C 2.3) Cross platform development: Flutter, React Native, Ionic 3) DESIGN 3.1) Website Design (UI (User Interface), UX (User Experience) etc.) 3.2) Graphic Design (Creative Design, Digital Design, Advertisement Design etc.) 3.3) Corporate Identity (Brand Boooks, Business Cards, Logos, LetterHeads etc.) 4) INTERNET MARKETING 4.1) Social Media Marketing (Linkedin, Xing, Facebook, YouTube, Instagram etc.) 4.2) SEO (SEO Copywriting, SEO Auditing, White Hat SEO) 4.3) PPC Marketing (Google Adwords, Google Ads, Facebook Ads, YouTube Ads, Instagram Ads etc.) 4.4) Email Marketing 5) MANAGED SERVICES 5.1) 24/7 TECHNICAL SUPPORT 5.2) SYSTEM ADMINISTRATION SERVICES Our team of high qualified System Administrators have huge experience with technologies covering: - different distributions of OS Linux, Unix and MS Windows Server systems; - different types of virtualization (ProxMox, Virtuozzo, OpenVZ, KVM, XEN, VMware, Hyper-V); - VPN/DNS/IPTables/Firewalls/web servers/mail servers configuration and tuning etc.; - cloud solutions (AWS, MS Azure, Google Cloud, Alibaba Cloud, OVHcloud, DigitalOcean, Linode etc.). 6) HOSTING SERVICES provided by our hosting subdivision under trade mark "TanHost" 6.1) Cloud based solutions (e.g. configuration and technical support of Private Clouds); 6.2) Сollocation services, the providing for rent dedicated and VPS/VDS (virtual servers); 6.3) Shared Hosting; 6.4) Domain names registration services; 6.5) SSL Certificates. 7) EMBEDDED SYSTEMS 7.1) Embedded software development 7.2) Internet of Things (IoT) 7.3) Microcontrollers programming 7.4) Arduino microcontrollers programming OUR CREDO: Reputation – is above anything else! We help our customers to grow success and we grow together with our customers! We are flexible to meet our clients' needs. We make it simple...

8.2
8.2
99%

Bhopal, India
$15 USD (1시간 기준)
We are a global software solutions provider, dedicated to delivering high-quality and dynamic software projects. Our core mission is to transform your vision into reality. From bespoke informational websites to data-driven applications and e-commerce platforms, our experienced in-house team of developers, designers, and graphic artists excels in project management and leverages cutting-edge technology to deliver impactful solutions. We craft tailored results, enriched with advanced features, to meet the unique needs of your business. Our Specialization: We excel in delivering end-to-end solutions using Latest Technologies within agreed timelines. Platforms we have worked on : ✅Wordpress ✅CI-4 ✅PHP ✅LARAVEL ✅FLUTTER ✅BOOTSTRAP ✅REACT ✅HTML 5 ✅CSS ✅OPENCART ✅CMS Our expertise grounds : ✅Web Designing ✅Web development ✅E-Commerce Website Development ✅Mobile Application Development ✅Web Application Development ✅Job Portal Development ✅Fintech Application Development ✅SEO ✅Domain Hosting & Registration ✅Information System Management ✅ERP ✅SMO To ensure continued success, we offer three months of complimentary website maintenance to all our clients. Let us bring your ideas to life—partner with us to create exceptional digital solutions for your business.

6.8
6.8
94%

Lahore, Pakistan
$50 USD (1시간 기준)
I am Muhammad Abdullah with 8 years of experiences A highly skilled IT professional with broad expertise in Linux system administration, software engineering, web development, and mobile application development. Demonstrates a deep understanding of a variety of operating systems, including Linux, Windows, macOS, Unix, and mobile platforms like Android and iOS. Adept at working with numerous programming languages such as Python, JavaScript, Java, C++, and more. Excels in creating efficient software solutions, designing and maintaining dynamic websites, and developing cross-platform mobile applications. Possesses a strong ability to optimize performance, ensure security, and deliver exceptional user experiences across diverse technological environments. This comprehensive skill set makes them a valuable asset for addressing complex technical challenges and driving innovation across multiple platforms

7.0
7.0
96%

CHITTAURGARH, India
$20 USD (1시간 기준)
Hello, I'm Rahul, a web developer with 12+ years of experience building websites, web apps, and SaaS platforms for businesses and individuals worldwide. Core Skills: WordPress, Joomla, CodeIgniter, Laravel, PHP, React, React Native, Next.js, Node.js, API Development, AI Integration, Mobile Apps, SaaS Development Why work with me: Technical depth — from custom WordPress themes to complex Laravel/PHP applications and full-stack SaaS builds Design sense — I build sites that look great and perform even better Reliable communication — quick responses, clear updates, on-time delivery Proven problem-solver — 12 years of debugging, optimizing, and shipping under real deadlines Services: Custom theme/plugin development, PHP & Laravel applications, e-commerce solutions, API & AI integrations, mobile apps, website performance optimization, ongoing maintenance & support I'd love to learn more about your project and show you how I can help bring it to life — efficiently, cleanly, and to spec. Looking forward to connecting! Rahul

8.9
8.9
96%

Rudraprayag, India
$25 USD (1시간 기준)
We are a dedicated and tightly knit team of experienced IT professionals, specializing in cutting-edge AI/ML solutions and robust development across Python and Java. We offer end-to-end digital solutions across web development, mobile applications, and digital marketing. Our expertise extends to DevOps practices, ensuring seamless integration, continuous delivery, and efficient deployment of all our projects. With a focus on quality, reliability, and long-term support, we collaborate closely with clients to deliver tailor-made, scalable, and result-oriented solutions. ☑️ Our Service Expertise Includes: - AI/ML Solutions (Predictive Models, Chatbots, Automations) - Blockchain Applications (Smart Contracts, Integrations) - Cloud Migrations & DevOps - SaaS, CRM, ERP Development - Project Research, Requirement Analysis & Documentation - UI/UX Design for Websites & Mobile Apps - Web & Mobile App Development (Front-end and Back-end) - Manual & Functional Testing - Server Setup, Maintenance & Security - Digital Marketing & Branding Solutions ☑️ Technical Portfolio: PHP-based CMS & E-commerce - WordPress, Joomla, Magento, Drupal, PrestaShop, OpenCart, BigCommerce, Typo3, Concrete5, osCommerce ☑️ PHP Frameworks - Laravel, CodeIgniter, Yii, CakePHP, Zend, Symphony, Smarty ☑️ Full-Stack JavaScript (MEAN / MERN / MEVN) - MongoDB, Express.js, Angular / React / Vue.js, Node.js ☑️ ASP.NET Development (Scratch Projects) - ASP.NET MVC 4/5, C# ☑️ Java & Python Development - Custom Enterprise Applications, Backend APIs, Web Applications - Integration with Spring Boot, Django, Flask, FastAPI ☑️ AI, Automation & Data Engineering - Workflow Automation using Python (RPA) - AI-based Tools Integration (OpenAI, LangChain, etc.) - NLP, Chatbot Development, Data Extraction & Processing Pipelines - Task Automation Scripts and Cron-based Services ☑️ Mobile App Development - iOS (Objective-C), Android (Java), Cross-Platform (Ionic, Cordova, PhoneGap) ☑️ Frontend Technologies - HTML5, CSS3, Bootstrap, Foundation, LESS, SCSS - AngularJS, BackboneJS, EmberJS, jQuery, ExtJS, Kendo UI ☑️ Digital Marketing & SEO - On-Page & Technical SEO, Off-Page SEO, PPC Campaigns (Google Ads, Social Media) ☑️ Ready for a Trial Job! -- We're confident in our ability to deliver exceptional value. Feel free to invite us for a trial project on Freelancer and experience our commitment firsthand!
A FreeSWITCH developer is a telephony engineer who designs, configures, and customizes FreeSWITCH, an open-source softswitch platform, to build scalable voice, video, and messaging communication systems. These specialists handle dial plans, SIP trunking, IVR logic, conferencing, and integrations with CRMs, billing systems, and WebRTC clients.
Hiring a skilled FreeSWITCH developer means getting a production-grade VoIP infrastructure that handles real call volume without dropped sessions, audio quality issues, or security holes. Whether you run a contact center, a hosted PBX service, a class 4 wholesale carrier, or a CPaaS startup, the right FreeSWITCH engineer turns a generic open-source stack into a reliable communications backbone tailored to your routing, billing, and reporting requirements.
FreeSWITCH is a modular, open-source telephony platform written in C, with scripting hooks for Lua, JavaScript, and Python, plus event sockets that allow integration with virtually any backend. A FreeSWITCH expert translates your business requirements into working dial plans, modules, and APIs that move calls reliably across SIP trunks, gateways, and endpoints.
Typical deliverables include:
A capable FreeSWITCH consultant works fluently across the broader VoIP ecosystem. Beyond FreeSWITCH itself, look for hands-on experience with SIP signaling, RTP media handling, and the supporting infrastructure that production telephony systems depend on.
FreeSWITCH developers serve any business that depends on voice or real-time communication. Common engagements include:
Strong FreeSWITCH engineers are part developer, part network engineer, part telephony specialist. Review portfolios for evidence of production deployments at scale, not just lab configurations. Look for experience writing custom modules, debugging SIP traces with sngrep or Wireshark, and integrating with real carriers.
Useful interview questions to copy and use:
Candidates should comfortably discuss SIP message flow, RTP behavior behind NAT, codec transcoding costs, and the trade-offs between XML, Lua, and ESL for dial plan logic. Certifications such as the FreeSWITCH training from the core team are a positive signal, as is contribution to the FreeSWITCH community or related open-source telephony projects.
Freelancer.com gives you direct access to a global pool of VoIP engineers, SIP specialists, and telephony consultants with verified profiles and client-reviewed track records. Whether you need a one-off dial plan fix or a long-term engineer to architect a softswitch platform, you can compare freelancers on Freelancer.com by skill, ratings, completed project history, and portfolio depth before you commit.
Clients set their own budgets and receive competitive bids from freelancers worldwide, which is particularly valuable for niche skills like FreeSWITCH where the right specialist may sit in any time zone. Milestone Payments protect your funds until work is delivered to your standard, and the platform's chat, file sharing, and tracking tools keep complex telephony projects organized end to end.
Ready to build or fix your VoIP stack?
Hiring the right FreeSWITCH developer comes down to a clear brief, careful review of bids, and disciplined evaluation of profiles. Telephony work is unforgiving — small misconfigurations cause dropped calls, one-way audio, or toll fraud — so the process below is designed to surface engineers who can deliver production-ready VoIP systems.
The quality of bids you receive is determined almost entirely by the quality of your brief. A vague post attracts generic responses, while a specific brief filters for FreeSWITCH developers who genuinely match your stack and goals. Head to the
Bids are short proposals, not just price quotes. A strong FreeSWITCH bid shows the freelancer has read your brief, understood the telephony architecture you need, and thought through real implementation questions. Read each proposal carefully and shortlist candidates whose technical reasoning matches the work.
The final decision combines proposal quality with the evidence on each freelancer's profile. For FreeSWITCH work, weigh consistency across past telephony projects rather than a single impressive example, since reliable VoIP delivery is about repeatable engineering discipline.
Simple tasks like adding an IVR menu or configuring a new SIP trunk often take a few days. Building a multi-tenant hosted PBX or a class 4 softswitch with billing integration typically runs several weeks to a few months, depending on integrations and call volume requirements.
Yes. Many clients hire FreeSWITCH developers for short engagements such as fixing audio issues, hardening security, writing a custom mod_ module, or migrating from another softswitch. You can also hire on Freelancer.com on an ongoing basis for maintenance and feature work after the initial build.
Both work with open-source VoIP platforms, but FreeSWITCH is built for higher concurrency, multi-threaded performance, and more advanced media handling, while Asterisk has a longer history in PBX deployments. Some engineers work with both, but for large-scale carrier-grade or CPaaS work, a dedicated FreeSWITCH expert is usually the better fit.
For most projects, a single experienced FreeSWITCH engineer or a small team of freelancers is sufficient and far more cost-effective than an agency. Agencies make sense only when you need round-the-clock NOC support alongside development, which you can also assemble from multiple freelancers on Freelancer.com.
Yes. FreeSWITCH exposes a powerful Event Socket Library and HTTP APIs that allow integration with virtually any CRM, helpdesk, or billing platform. A skilled developer can push call events, screen-pop caller data, and write CDRs into your existing database in real time.

Freelancer 엔터프라이즈
89.5백만 명의 인력을 활용하여 비즈니스 성과를 높이세요.

오늘 바로 프로젝트를 등록하시고, 프리랜서 인재들의 입찰 견적서를 받아 보실 수 있습니다.
FreeSwitch 프로젝트에서 영감을 얻어보세요.

웹사이트 디자인
$540 USD (7일 소요)

앱 디자인
$100 USD (1일 소요)

웹사이트
$430 USD (1일 소요)

웹사이트 디자인
$140 USD (13일 소요)

앱 디자인
$200 USD (19일 소요)

웹사이트
$150 USD (13일 소요)

웹사이트
$240 USD (1일 소요)

웹사이트
$100 USD (1일 소요)
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89.5건(단위: 백만)
89.5건(단위: 백만)
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25.8건(단위: 백만)
25.8건(단위: 백만)
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