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Ganesh D.

5.0

774

7.9

99%

Hetauda, Nepal

$50 USD per hour

Let's keep this short. Anything related to IT: (System/Network/DevOps/Virtualization/Wordpress/Development/Servers/Mail) I can handle them all, period. Ganesh D.

VoIP PHP Python Website Design Internet Marketing

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Muhammed Rafi K.

5.0

439

7.9

99%

Malappuram, India

$60 USD per hour

Top 1% in the Freelancer.com Community. I am excited to offer 16+ years of solid experience in Physical & Virtual Server & Networking Platforms, System Administration, Network Administration,Managing Telecommunications Networks and Technical Strategy. Below are a few of my strong assets for your business: - Microsoft(Active Directory, DNS,DHCP, RDS,SQL Server(DB Admin),SharePoint, - Hyper-V, Exchange(All Versions &O365)Azure) - VMWare (ESXi, VCenter) - Citrix (XenApp, XenCenter) - Antivirus(Symantec(SEP),Mcafee(EPO),Kaspersky) - Linux (Ubuntu, CentOS,Debian) - Cloud(MS Azure,AMAZON AWS ,Google GCP,OVH and Digital Ocean) - Storage(Synology,QNAP,FreeNAS,WD,Dell and HP) - VOIP ( Avaya,3CX,Yeastar,XCally,GrandStream & FreePBX) - Firewalls (Fortinet, Sonicwall, Sophos, ASA,WatchGuard&PFSense) - Wireless(Cisco,Unify,Grandstream,Fortigate) - Routers (Cisco, Ubiquiti) - Servers (HP Proliant Servers) & (Dell/EMC Servers) I am happily available anytime using secure remote support or walk you through the steps via Freelancer chat .I am looking to show each client my worth to build a long relationship. Get started by clicking on "Hire Me"

VoIP PHP C Programming Python Website Design

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Kazi N.

4.9

183

5.9

98%

dhaka, Bangladesh

$20 USD per hour

I am an expert network and security administrator and I have 10 year’s practical working and teaching experience in network and security also i am en expert in data entry jobs and excel Microsoft office. I am a CCNA instructor and I have CCNA, RHCE, RHCSA certifications. I have expertise in CISCO routing and switching, firewall, IPS, ISE, voice and wireless solution from my 10 years’ practical experience. I have also fluency in English and Hindi speaking. I am Expert in GNS3 and Packet Tracer. ===================================================================================== Technical Skills: Good understanding and knowledge of TCP/IP, OSI Layer. L3 technologies: RIP, EIGRP and OSPF and BGP in CISCO 800, 1900, 2900, 2800, 2800, ISR 4300, 4100, ASR 1000 series. L2 technologies: VLAN, VTP, STP, Trunking, HSRP, VRRP, SPAN, RSPAN, DHCP Snooping, Dynamic ARP Inspection, ARP ACL etc in 2900 series and L3 switches. NXOS and ACI: Configure and install CISCO nexus 9k and CISCO ACI solution like Bridge Domain, VRF, end point group tenant etc. Cisco ASA and Next Generation Firewall: ACL, NAT, Transparent Mode, Multiple context and Failover (Active/Active, Active/Standby) Site-to-Site VPN, Remote Access VPN and SSL VPN. Cisco Firepower IPS and Firepower Management Center (FMC): ACL, NAT, Intrusion policy, AVC, Malware & File Policy, Site-to-Site VPN, Remote Access VPN and SSL VPN etc. F5 Load Balancer and ASM: Installation and configure F5 BIG-IP Local Traffic Manager (LTM) load balancer and Application security manager. CISCO CUCM: Install and configure Cisco Unified Communication Manager 9.0 and 12.4. Mikrotik Router: OSPF, BGP, NAT, DHCP, L2TP, IPSEC, PPP, Firewall etc CISCO WEB and Email Security Appliance: Install and configure CISCO ESA and WSA So you are requested to first discuss the project and requirements and after being satisfied please awarded me with the work. And definitely work will be delivered in time and in best quality. Thanking You Kazi

VoIP Copywriting Web Security Data Entry Excel

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Muhammad A.

4.9

218

7.8

99%

Karachi, Pakistan

$50 USD per hour

After getting 14 years of experience in System and IT administration along with multiple certifications, I am confident enough for providing you a perfect solution to your technical issues and projects from starting to the completion. I would be available on daily basis as required and full time available on weekends. Having a flexible and friendly nature, you would find me very cooperative and dedicated to your work. I am proficient in the following areas: Cloud Computing ---> AWS (EC2, RDS, VPC, ECS, EKS, S3, EFS, Cloudfront, Elastibeanstalk, etc) Cloud Computing ---> Azure (VM's, Vnet, Scaleset, Function Apps, App Services, CosmosDB, FlexibleDB, AKS, Blob Storage, etc..) Containerization ---> Docker, Docker-compose, Kubernetes DevOps ---> Jenkins, Bitbucket, Github, Terraform, Ansible, Python Virtualization ---> Vmware Vsphere High Availability & Disaster Recovery ---> Veeam Backup & Replication Windows Server ---> Active Directory, File Services, WDS Mail Server, Database Server ---> Exchange, Mdaemon VOIP ---> Elastix, Freepbx Website Development ---> Wordpress, PHP, HTML, CSS, Javascript

VoIP PHP JavaScript .NET Script Install

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Mahmoud H.

4.8

190

6.6

90%

El-Mokattam, Egypt

$25 USD per hour

I’m a Senior Network & Security Engineer with 10+ years of hands-on experience designing, implementing, and migrating enterprise and service-provider networks. I specialize in Network Security, SD-WAN, routing & switching, enterprise wireless, and secure network architecture, helping companies modernize legacy networks, improve reliability, and reduce WAN costs. Core expertise: - Firewalls & Security: FortiGate, Palo Alto, Cisco ASA / Firepower IPsec & SSL VPN, site-to-site, remote access, policy design - Routing & Switching: Cisco ASR/ISR, Catalyst, Nexus (BGP, OSPF, EIGRP, IS-IS, MPLS, VLANs, STP, HSRP/VRRP) Enterprise LAN & campus design - LAN Switching (Multi-Vendor): Cisco, Meraki, HP, Aruba, FortiSwitch Access/core design, redundancy, QoS, segmentation - Enterprise Wireless: Cisco WLC & APs, Cisco Meraki Wi-Fi, Aruba Wi-Fi, FortiAP Coverage design, roaming, security, troubleshooting - SD-WAN: Fortinet SD-WAN, Cisco SD-WAN (Viptela), Cisco Meraki (hub-and-spoke, MPLS + Internet, segmentation, HA, traffic steering) - Cloud & Hybrid Networking: AWS / Azure / GCP Site-to-site VPN, routing integration - Network Automation: Python Certifications: CCIE Enterprise Cisco Certified Specialist – Enterprise SD-WAN Implementation CCNP Data Center CCNP Security Juniper JNCIA-Junos, JNCIA-Cloud If you share your current setup and goal, I can propose a clear and practical solution.

VoIP Linux Wireless Computer Security Cisco

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Narola Infotech

4.7

2155

10.0

97%

Surat, India

$15 USD per hour

⭐ Top 1% on Freelancer.com | Narola Infotech - Digitalising Businesses Since 2005 ✎ About Us We are Narola Infotech, a globally recognized IT solutions company with 20+ years of experience delivering high-performance web, mobile, and enterprise software solutions to 1500+ happy clients across 50+ countries. Trusted by Fortune companies like CGI, L&T, Infosys, Biocon, and TVSNext. We don't just build software, we build lasting partnerships. Our approach is simple: understand your vision, deliver beyond expectations, and stay with you every step of the way. ✎ Why Choose Us? ➬ 20+ Years of Industry Experience ➬ 350+ Talented IT Professionals ➬ 3000+ Successfully Delivered Projects ➬ 95% Client Retention Ratio ➬ 4.9 ⭐ Clutch Rating ➬ 100% Project Success Ratio ➬ Clutch Top 1000 Companies Global 2022 ➬ Best Outsourcing Company - SGCCI ✎ Our Services ➬ Custom Web & Mobile App Development ➬ Custom Enterprise Software Development ➬ AI/ML & Data Analytics Solutions ➬ QA & Software Testing (Automation, Security, Performance) ➬ DevOps, Cloud Migration & Managed Services ➬ Salesforce Consulting, Implementation & Support ➬ Staff Augmentation - Dedicated Teams or Individual Developers ➬ Support & Maintenance ✎ Tech Stack ➬ Frontend: ReactJS, AngularJS, VueJS, NextJS, NuxtJS ➬ Backend: Node.js, Java, PHP, Laravel, .NET, Python, Django, WordPress ➬ Mobile: Flutter, React Native, iOS (Swift), Android (Java/Kotlin) ➬ Cloud & DevOps: AWS, Azure, Docker, Kubernetes, Jenkins, CI/CD, Terraform ➬ Database: MySQL, MongoDB, PostgreSQL, Firebase, MS-SQL ➬ Other: Salesforce, MS Dynamics 365, Power Platform, Big Data, AI/ML, Automation ✎ Industries We Serve ● Fintech ● Healthcare ● Retail & Ecommerce ● Education ● Real Estate ● Media & Entertainment ●Transport & Logistics ✎ Our Strengths ➬ Agile Development Methodology ➬ Daily & Weekly Progress Reports ➬ Clear Communication & Collaboration ➬ 100% Plagiarism-Free & Secure Delivery ➬ Guaranteed Data Privacy & NDA Protection ➬ Flexible Engagement Models: ● Fixed Cost ● Time & Material (Hourly) ● Dedicated Team ● Hybrid Model (Fixed + Hourly) ✎ Our Promise "You will get the value of every penny you spend. We are committed to driving your business forward with reliable, quality solutions powered by technology and innovation." - Ashish Narola, CEO

VoIP PHP ASP Java JSP

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Decent Creators

5.0

950

8.1

100%

Karachi, Pakistan

$10 USD per hour

✅Verified professional freelancer ✅ 99% job complete rate l 98% on budget l 98% on time with 16% repeat hire rate. Quality is guaranteed! PROFESSIONAL | GRAPHICS DESIGNER | WORDPRESS DEVELOPER | VIDEO EDITOR | ANIMATOR With Vast Experience in this field. You can get your Stuff designed in a Professional & Creative way! Logo designs I Video editing I 2d animations I Logo animations I Animated stories I Business card I Letter head I Boucher I Flyer I Illustration I Website designs I WordPress websites I Html signature and much more under a single profile contact us and lets get started right away! __________Decent Creators____________

VoIP PHP JavaScript Website Design Graphic Design

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Kuldeep N.

4.8

893

7.8

96%

Jaipur, India

$20 USD per hour

With 15+ years of experience in Web Hosting, Cloud Infrastructure, Email Marketing Systems, DevOps & Linux Server Administration, I help businesses run high-performance, secure and scalable environments. I’ve worked with all major cloud platforms including AWS, Google Cloud, Digital Ocean, and have successfully delivered 850+ projects with excellent client satisfaction. 🌐 Core Services 🔸 Server & Cloud Management • Server Setup & Optimization (Linux, Ubuntu, CentOS, Alma Linux) • WHM/cPanel, Plesk, Webmin, CyberPanel • VPS / Dedicated / Cloud Server Management • Security Hardening & Firewall Setup (CSF, UFW) • HA-Proxy Load Balancing, Auto-Scaling • NGINX, Apache, PHP-FPM tuning • Backup, Disaster Recovery & Monitoring • SSL Installation, Fixing SSL/CURL Issues ________________________________________ 🔸 DevOps & Automation • Docker, Kubernetes, Ansible, Jenkins • CI/CD Pipelines • Cloud Infrastructure Automation • Git, GitHub Actions • Infrastructure Scaling & Optimization ________________________________________ 🔸 Video Streaming & Real-Time Platforms • BigBlueButton (BBB) Setup & Customization • Jitsi Meet • Red5, Wowza • Live Streaming Server setup (RTMP, HLS) ________________________________________ 🔸 Email Marketing Infrastructure • SMTP (Postfix, Send mail, PowerMTA) • DKIM, DMARC, SPF, rDNS Setup • MailWizz, Interspire, Acelle, Sendy, Mumara • Email Warmup, Inbox Optimization • SES, SendGrid, Mailgun Integration • Email Deliverability Fixes ________________________________________ 🔸 Windows & Office Services • Office 365 Setup & Administration • Windows Server Management • SSL Troubleshooting ________________________________________ 🔎 Digital Marketing Experience With 9+ years in Digital Marketing & SEO, I help clients increase online visibility using: • SEO (On-page, Technical, Off-page) • Google Ads Campaign Optimization • Website Audit & Traffic Growth Strategies Weekly and monthly performance reports are provided for full transparency.

VoIP PHP Website Design Graphic Design Internet Marketing

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HashOne Creatives

4.6

677

9.7

96%

Karachi, Pakistan

$40 USD per hour

At HashOne Creatives, we deliver AI-driven solutions, powerful web platforms, and mobile applications that help businesses automate, scale, and innovate. With a global team of 200+ experts across the US, UAE, and Pakistan, we combine deep technical expertise with a client-first approach to build solutions that create real business impact. ✅ Our AI Expertise We’ve built solutions across industries like education, healthcare, media, recruitment, and business automation, helping clients stay ahead in the digital age. ✔️ Generative AI – Turning text prompts into images, videos, avatars, and branded content. ✔️ Business AI Assistants – Automating inbound & outbound communication across calls, WhatsApp, SMS, and emails with appointment booking and knowledge-base support. ✔️ Identity Verification – End-to-end KYC automation using OCR, face recognition, liveness detection, and biometric checks. ✔️ Language Learning & Training – AI-powered tutors for practicing English or preparing for professional interviews with real-time evaluation. ✔️ Voice AI & Dubbing – Automated outbound lead-calling, voice cloning, and dubbing tools for multilingual media publishing. ✔️ Sports & Media AI – Real-time multilingual sports commentary and automated video editing for content creators. ✔️ Recruitment & Search – Smart enterprise search tools that let recruiters filter and discover talent through natural language queries. ✅ Web & Mobile Development Alongside AI, we also deliver scalable and secure platforms for startups and enterprises: ✔️ Web Applications – React.js, Next.js, Node.js, Laravel, Django. ✔️ Mobile Apps – Native iOS/Android, Flutter, React Native. ✔️ Cloud & APIs – AWS, Azure, Google Cloud, 3rd-party API integrations. ✔️ Enterprise Solutions – CRM, ERP, and workflow automation. ✅ Why Choose Us? ✔️ 200+ Technology experts across multiple Global locations ✔️ Proven expertise in delivering enterprise-grade AI and digital platforms ✔️ End-to-end services – from concept to deployment & ongoing support ✔️ Agile, scalable, and secure solutions tailored to your business ✔️ Transparent communication & Agile delivery ✔️ Long-term support, maintenance & product scaling ✔️ Business-Focused Approach That Prioritizes ROI Whether you're building an AI startup, modernizing legacy systems, launching a SaaS platform, or creating a mobile application, our team is ready to help you bring your vision to life. Let's build technology that creates measurable business value.

VoIP PHP C Programming JavaScript Python

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Clients rate our VoIP Developers

4.83 out of 5

from 23,565 reviews

How to hire a great freelance VoIP Developer

A VoIP developer is a software engineer who builds, integrates, and maintains voice over IP systems that transmit voice, video, and messaging over internet protocols instead of traditional telephone lines. Hiring a skilled VoIP developer means getting a specialist who can architect call flows, configure SIP trunks, and deliver reliable real-time communication infrastructure for your business. Whether you need a hosted PBX, a click-to-call feature inside a web app, or a full contact center platform, a VoIP engineer turns telephony requirements into working code.

What does a VoIP developer do?

VoIP developers design and implement systems that handle real-time voice and video traffic across IP networks. Their work spans low-level protocol handling, server configuration, application development, and integration with business tools like CRMs and helpdesks.

Commercially, VoIP engineering matters because communication infrastructure directly affects customer experience, sales conversion, and operational cost. A well-built VoIP system reduces telephony spend, scales with call volume, and integrates with the software your team already uses. A poorly built one drops calls, leaks data, and frustrates customers.

Core deliverables and services

A freelance VoIP developer typically handles a mix of the following work, depending on project scope:

Asterisk, FreePBX, FreeSWITCH, and Kamailio installation, configuration, and customization

SIP trunk provisioning, routing, and troubleshooting between carriers and PBX systems

Custom IVR design, call queues, ring groups, voicemail, and call recording

WebRTC integration for browser-based calling and video conferencing

Twilio, Plivo, Vonage, and Bandwidth API integrations for programmable voice and SMS

Softphone and mobile dialer development on iOS and Android using PJSIP or native SIP stacks

Call center features including predictive dialers, ACD, agent dashboards, and real-time monitoring

CRM and helpdesk integrations with platforms like Salesforce, HubSpot, Zoho, and Zendesk

STUN, TURN, and ICE configuration to handle NAT traversal

Codec optimization (G.711, G.729, Opus) and QoS tuning for call quality

Security hardening against toll fraud, SIP attacks, and eavesdropping with TLS and SRTP

Billing system integration, CDR analysis, and reporting

Tools, protocols, and technologies

Strong VoIP developers are fluent in the open-source and commercial stack that powers modern telephony. Expect candidates to reference tools like Asterisk, FreeSWITCH, Kamailio, OpenSIPS, FusionPBX, and Issabel on the server side. On the application side, look for experience with Twilio, Plivo, Vonage API, Amazon Connect, and Genesys Cloud.

Protocol knowledge should include SIP, RTP, RTCP, SDP, IAX2, MGCP, and WebRTC. Languages commonly used in VoIP projects include PHP, Python, Node.js, Go, Java, and C for performance-critical components. Familiarity with Lua and Asterisk's AGI and AMI interfaces is valuable for custom call logic.

Industries and use cases

VoIP developers serve a wide range of clients with different communication needs:

Call centers and BPOs running outbound dialers and inbound support queues

SaaS platforms embedding click-to-call, video meetings, or in-app messaging

Healthcare providers needing HIPAA-compliant telehealth and patient calling

Real estate, insurance, and finance firms automating lead distribution and call tracking

ITSPs (internet telephony service providers) and resellers launching hosted PBX services

E-commerce and logistics companies routing customer service calls and SMS notifications

Hotels and hospitality businesses replacing legacy PBX with IP-based room phones

How to evaluate VoIP developer candidates

Telephony engineering rewards depth, so look closely at hands-on experience rather than general full-stack credentials. Strong signals include production deployments of Asterisk or FreeSWITCH, contributions to telephony open-source projects, carrier-side experience with SIP trunking, and proven ability to debug call quality issues using packet captures.

Review portfolios for evidence of completed call center builds, custom IVR flows, WebRTC apps, or API-driven voice features. Ask for architecture diagrams or anonymized dialplans. Check that candidates understand security: toll fraud and SIP brute-force attacks are common and expensive.

Useful interview questions to copy and use:

Can you walk me through how you would architect a multi-tenant hosted PBX using FreeSWITCH or Asterisk?

How do you diagnose one-way audio or choppy calls, and what tools do you use to capture and analyze SIP and RTP traffic?

What steps do you take to secure a SIP server against toll fraud and registration attacks?

Have you integrated WebRTC with a SIP backend, and how did you handle NAT traversal and codec negotiation?

Describe a time you integrated a VoIP system with a CRM. What APIs and events did you use to sync calls and contacts?

Why hire VoIP developers on Freelancer.com

Freelancer.com gives you direct access to a global pool of telephony engineers with experience across Asterisk, FreeSWITCH, Twilio, WebRTC, and contact center platforms. You can review profiles, portfolios, certifications, and verified client reviews before you commit, and compare competitive bids from specialists who match your exact stack.

Whether you need a one-off SIP trunk fix, a long-term engagement to build a hosted PBX product, or a contractor to maintain an existing VoIP platform, Freelancer.com helps you find the right person. Clients set their own budgets, post detailed briefs, and receive bids from freelancers on Freelancer.com within hours. Milestone Payments protect your funds until work is delivered to spec.

Post a project on Freelancer.com today and connect with skilled VoIP developers ready to build, integrate, and support your voice infrastructure.

What are the steps to hiring a freelance VoIP developer?

Hiring a VoIP developer on Freelancer.com is straightforward when you approach it methodically. The clearer your brief, the better the bids — and the better the bids, the faster you find a freelancer who can actually deliver your call flows, integrations, or PBX deployment. Here is the process from posting to award.

Step 1: Post your project on Freelancer.com

Your project post is the single biggest factor in the quality of bids you receive. A precise brief filters out generalists and attracts VoIP engineers whose experience genuinely matches your stack — whether that is Asterisk, FreeSWITCH, Twilio, or a custom WebRTC build. Head to the post project page , where you fill in the brief, scope, timeline, and budget before publishing the project for freelancers to bid on.

Specify the telephony platform you are targeting (Asterisk, FreeSWITCH, Kamailio, FreePBX, Twilio, Plivo, etc.)

Describe the call flows, IVR logic, queues, or features you need built

List integrations required — CRM, helpdesk, billing system, or custom API endpoints

State expected concurrent call volume, codecs, and any QoS or compliance requirements

Note your SIP trunk provider, hosting environment, and any existing infrastructure

Provide timeline expectations and indicate your budget range

Step 2: Review bids from freelancers

Bids are short proposals that reveal how a developer interprets your brief. A strong VoIP bid does more than quote a price — it references the right protocols, raises sensible technical questions, and proposes a realistic approach. Read each proposal carefully and shortlist candidates whose understanding matches the work.

Look for clarity on architecture: which PBX, which APIs, what database, what hosting model

Check whether the bidder asks about NAT traversal, codecs, concurrent calls, or carrier specifics

Assess timeline realism against the complexity of your call flows and integrations

Review attached samples — dialplans, IVR diagrams, GitHub repositories, or anonymized case studies

Use Freelancer.com's chat to ask clarifying questions about SIP experience, security practices, and similar past work before shortlisting

Step 3: Evaluate freelancers and award the project

Your final decision should combine proposal quality with profile evidence. Look for consistency across multiple completed VoIP projects rather than a single impressive example. Telephony bugs are expensive, so weight reliability and communication signals heavily.

Review portfolio depth across PBX deployments, API integrations, and call center builds

Check star ratings and the volume of completed projects in telephony or related backend work

Read written client reviews for comments on debugging, communication, and on-time delivery

Confirm verified payment method, completion rate, and on-time delivery rate on the profile

Award the project and use Freelancer.com's Milestone Payments to release funds as deliverables — server setup, dialplan completion, integration testing — are met

How long does a VoIP development project take?

Timelines depend heavily on scope. A simple Twilio integration or IVR build can be completed in a few days, while a full multi-tenant hosted PBX or contact center platform typically takes several weeks to several months. Discuss milestones with your shortlisted developer to set realistic delivery dates.

What is the difference between a VoIP developer and a network engineer?

A VoIP developer writes software, configures telephony servers like Asterisk or FreeSWITCH, and builds applications that handle voice traffic. A network engineer focuses on the underlying network layer — routers, firewalls, QoS, and bandwidth. Many VoIP issues sit at the intersection, so strong VoIP developers understand networking fundamentals even if they do not own that layer.

Can I hire a VoIP freelancer for a one-off project?

Yes. Many businesses post a project on Freelancer.com for short engagements such as installing FreePBX, configuring SIP trunks, debugging call quality, or building a single Twilio workflow. You can also extend the engagement into ongoing maintenance if the work goes well.

Do I need a VoIP developer or a full agency?

For most defined scopes — integrations, custom dialplans, mobile softphones, or single-tenant PBX deployments — an experienced freelance VoIP developer is faster and more cost-effective than an agency. Consider a larger team only if you need 24/7 NOC coverage, carrier-grade infrastructure, or simultaneous work across telephony, frontend, and DevOps.

What information should I share with a VoIP developer before they start?

Share your call flow requirements, expected concurrent call volume, preferred PBX or API platform, carrier or SIP trunk provider, and any compliance needs such as HIPAA or PCI. Network topology, existing CRM tools, and a list of integration endpoints also help the developer scope the work accurately.