VoIP, otherwise known as Voice over Internet Protocol, is a digital solution for telecommunication that utilizes the transmission of voice through the use of data over the internet. This technology is typically adopted for both commercial and privately used applications. VoIP developers specialize in programming telecommunication systems using data transmission to provide efficient services for audio and video functions.

VoIP developers are highly sought after professionals as they can create a versatile and advanced system for both desktop and mobile devices. This can include creating a more interactive experience for customers with multi-way calls, conference calls, video conferencing and voicemail systems. VoIP developers can set up your business’s phone system such as forwarding calls remotely to other devices with extensions or even communicating with customers utilizing software like Callcentric, Flowroute or Voxbone.

Here's some projects that our expert VoIP Developer made real:

  • Secured and configured private networks by implementing security measures like IP SLA, NAT and ACLs
  • Integrating SIP trunks between billing platforms, PBXs and VoIP applications
  • Setting up Postfix mail server on Linux systems with TLS authentication and encryption
  • Installing and configuring sip telephony software like ASTPP into businesses
  • Developing web applications that can send and receive SMS messages utilizing VoIP APIs

Our expert VoIP Developer have created numerous projects to help business owners manage their telecommunications in a professional bet. Our developer have an array of experience in creating a secure and reliable system customized to each client demands. If you're looking to improve or create your business’ communication system, then post your project today on Freelancer.com to hire one of our skilled professional VoIP Developers today!

From 21,703 reviews, clients rate our VoIP Developers 4.82 out of 5 stars.
Hire VoIP Developers

VoIP, otherwise known as Voice over Internet Protocol, is a digital solution for telecommunication that utilizes the transmission of voice through the use of data over the internet. This technology is typically adopted for both commercial and privately used applications. VoIP developers specialize in programming telecommunication systems using data transmission to provide efficient services for audio and video functions.

VoIP developers are highly sought after professionals as they can create a versatile and advanced system for both desktop and mobile devices. This can include creating a more interactive experience for customers with multi-way calls, conference calls, video conferencing and voicemail systems. VoIP developers can set up your business’s phone system such as forwarding calls remotely to other devices with extensions or even communicating with customers utilizing software like Callcentric, Flowroute or Voxbone.

Here's some projects that our expert VoIP Developer made real:

  • Secured and configured private networks by implementing security measures like IP SLA, NAT and ACLs
  • Integrating SIP trunks between billing platforms, PBXs and VoIP applications
  • Setting up Postfix mail server on Linux systems with TLS authentication and encryption
  • Installing and configuring sip telephony software like ASTPP into businesses
  • Developing web applications that can send and receive SMS messages utilizing VoIP APIs

Our expert VoIP Developer have created numerous projects to help business owners manage their telecommunications in a professional bet. Our developer have an array of experience in creating a secure and reliable system customized to each client demands. If you're looking to improve or create your business’ communication system, then post your project today on Freelancer.com to hire one of our skilled professional VoIP Developers today!

From 21,703 reviews, clients rate our VoIP Developers 4.82 out of 5 stars.
Hire VoIP Developers

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    23 jobs found

    **PROJECT: AI Voice Companion Pipeline — + ElevenLabs + Twilio + Airtable + Claude API** --- **OVERVIEW** I am building an AI companion service that makes scheduled outbound phone calls to elderly users. The AI agent (already configured in ElevenLabs Conversational AI) conducts a 7-minute conversation, and the system then processes the transcript to extract memory and generate a wellbeing report. I need an experienced developer to build the full automation pipeline connecting all components. The AI agent and system prompt are already written. You are building the plumbing, not the intelligence. --- **TECH STACK** - ElevenLabs Conversational AI - Twilio (outbound UK phone calls) - Airtable (user profiles, call records, memory storage) - (all automation and orchestration) - ...

    $193 Average bid
    $193 Avg Bid
    66 bids

    Vicidial is already live on our cloud server; what I need now is an on-site engineer in Hyderabad who can bridge it to a 32-port Dinstar GSM gateway sitting in our office. Your task is strictly configuration and testing—no fresh installs. Scope of work • Register the Dinstar gateway as a SIP trunk inside Vicidial, keeping a close eye on call-quality parameters and full compatibility with the gateway. • Analyse the current router, decide which ports must be opened, then set up forwarding so traffic reaches the cloud server cleanly. No predefined template exists, so you will determine the rules and apply them. • Run end-to-end test calls, troubleshooting the single audio problem we’ve seen so far: distorted sound. I expect clear audio on both legs before sign-off....

    $85 Average bid
    $85 Avg Bid
    9 bids

    We are seeking a skilled and experienced VICIdial and VoIP engineer to set up a cloud-based call center solution. Current Setup: - A GSM/VoIP gateway (Dinstar). - No physical server at the moment. - Planning to purchase a suitable cloud-based Linux server (e.g., VPS) based on your recommendation. - AnyDesk access is available for remote configuration. Scope of Work: 1. Recommend the best cloud server provider and required specifications suitable for our needs. 2. Install and configure VICIdial and Asterisk on the cloud server. 3. Integrate the Dinstar gateway with the cloud server. 4. Provide detailed guidance on connecting the Dinstar gateway with our router/switch, including cable instructions. 5. Configure inbound and outbound calling. 6. Set up agent logins and ensure web access for ...

    $102 Average bid
    $102 Avg Bid
    11 bids

    Hello, I hope you are doing well! We are looking for an experienced VICIdial and VoIP engineer to set up a complete cloud-based call center solution. Our Current Setup - We have a GSM/VoIP gateway (modem). - We do not have a physical server. - We plan to purchase a cloud-based Linux server (VPS), such as from "InterServer" or any provider you recommend. - We can provide "AnyDesk" access to our desktop so you can remotely configure the setup. Scope of Work 1. Recommend the best cloud server provider and required server specifications. 2. Install and configure VICIdial and Asterisk on the cloud server. 3. Integrate the Dinstar gateway with the cloud server. 4. Guide us on how to connect the Dinstar gateway to our router/switch and where each cable should be plugged ...

    $173 Average bid
    $173 Avg Bid
    7 bids

    I’m looking for a reliable person who can pick up my business line whenever I’m unavailable and handle general-inquiry calls in a courteous, professional manner. Expect no more than one call a day on average, so this is truly light-volume work; nevertheless, each caller must feel they’ve reached a polished, well-run office. *I need you to act as a credible reference for future employers Here’s what I need from you: • Answer the call using my templates (I’ll provide the exact wording). • Note the caller’s name, contact details, and the reason for calling. • Email or text me the call summary right after you hang up. Because these are general inquiries, you won’t need deep industry knowledge; a clear speaking voice, attentive...

    $387 Average bid
    $387 Avg Bid
    4 bids

    I’m looking for a reliable person who can pick up my business line whenever I’m unavailable and handle general-inquiry calls in a courteous, professional manner. Expect no more than one call a day on average, so this is truly light-volume work; nevertheless, each caller must feel they’ve reached a polished, well-run office. *I need you to act as a credible reference for future employers Here’s what I need from you: • Answer the call using my templates (I’ll provide the exact wording). • Note the caller’s name, contact details, and the reason for calling. • Email or text me the call summary right after you hang up. Because these are general inquiries, you won’t need deep industry knowledge; a clear speaking voice, attentive...

    $10 / hr Average bid
    $10 / hr Avg Bid
    1 bids

    I run a small 10x10-foot TikTok studio and I’m ready to tighten up my audio chain. All the gear is here—Shure MV7 (XLR), Elgato Stream Deck, Wave Link, OBS, TikFinity, Voicemod, and a pair of Bluetooth in-ear monitors—but I need someone to come onsite and make it all talk to each other. Here’s what I’m after: the Shure MV7 and Stream Deck must feed cleanly into TikTok Studio while also reaching my Bluetooth IEM with zero noticeable latency. The Stream Deck is mainly there for sound effects and overall audio control, so its profiles and key assignments need to be mapped through Wave Link and reflected in OBS and Voicemod without any volume jumps or channel conflicts. Physical cabling, software routing, gain staging, filter setup, and basic noise reduction all...

    $425 Average bid
    $425 Avg Bid
    9 bids

    We use MicroSIP and Linkus most of our PBX Use Yeastar and Granstrean our Dial Pattern is you want to call egypt you must remove the country code which is +20****** to 70***** also for short numbers same ,, must remove the country code and and 7 automated as Dial Pattern we choose ,, also from Egypt to Saudi the Dial Pattern is +966 but the Dial Pattern is 6 so it's must conver it to 6055****** like that ,, so we need templates for these Dial Pattern with on of add new number start without showing it in the dial screen so it will be like you dial local numer but infact it's use Dial Pattern for every country template we add or edit etc.. you will find it in the attachment so you dont need to save number in directory it will detect wich country is the as smart ,, also we need desk...

    $159 Average bid
    $159 Avg Bid
    50 bids

    I’m looking for a reliable person who can pick up my business line whenever I’m unavailable and handle general-inquiry calls in a courteous, professional manner. Expect no more than one call a day on average, so this is truly light-volume work; nevertheless, each caller must feel they’ve reached a polished, well-run office. *I need you to act as a credible reference for future employers Here’s what I need from you: • Answer the call using my templates (I’ll provide the exact wording). • Note the caller’s name, contact details, and the reason for calling. • Email or text me the call summary right after you hang up. Because these are general inquiries, you won’t need deep industry knowledge; a clear speaking voice, attentive...

    $38 / hr Average bid
    $38 / hr Avg Bid
    3 bids

    I need a genuine Greek phone number that I can use to serve my Egyptian customers from abroad. The number must: • Register smoothly on WhatsApp Business so I can chat and share updates with clients. • Handle reliable international voice calls to Egypt without noticeable lag or quality loss. SMS is optional; voice is the key channel alongside WhatsApp. Please let me know what form the number will take (e-SIM, virtual line, traditional SIM, etc.), how quickly you can activate it, and any straightforward steps I’ll need to follow for setup on my iPhone and desktop WhatsApp. If there are monthly fees, documentation requirements, or fair-use limits, outline those up front so I have no surprises. My deliverable expectation is simple: an active Greek number ready for WhatsApp...

    $8 / hr Average bid
    $8 / hr Avg Bid
    14 bids

    Vicidial is already live on our cloud server; what I need now is an on-site engineer in Hyderabad who can bridge it to a 32-port Dinstar GSM gateway sitting in our office. Your task is strictly configuration and testing—no fresh installs. Scope of work • Register the Dinstar gateway as a SIP trunk inside Vicidial, keeping a close eye on call-quality parameters and full compatibility with the gateway. • Analyse the current router, decide which ports must be opened, then set up forwarding so traffic reaches the cloud server cleanly. No predefined template exists, so you will determine the rules and apply them. • Run end-to-end test calls, troubleshooting the single audio problem we’ve seen so far: distorted sound. I expect clear audio on both legs before sign-off....

    $156 Average bid
    $156 Avg Bid
    1 bids

    Vicidial is already live on our cloud server; what I need now is an on-site engineer in Hyderabad who can bridge it to a 32-port Dinstar GSM gateway sitting in our office. Your task is strictly configuration and testing—no fresh installs. Scope of work • Register the Dinstar gateway as a SIP trunk inside Vicidial, keeping a close eye on call-quality parameters and full compatibility with the gateway. • Analyse the current router, decide which ports must be opened, then set up forwarding so traffic reaches the cloud server cleanly. No predefined template exists, so you will determine the rules and apply them. • Run end-to-end test calls, troubleshooting the single audio problem we’ve seen so far: distorted sound. I expect clear audio on both legs before sign-off....

    $72 Average bid
    $72 Avg Bid
    1 bids
    iOS Call Recorder Development
    3 days left
    Verified

    I need a straightforward iOS solution that records every call—both incoming and outgoing—and keeps the audio files right on the device for quick review. The project is strictly for my personal use, so the interface can stay minimal as long as it is reliable and easy to navigate. Core expectations • Capture full-length, high-quality audio of any call I place or receive. • Store recordings locally in an organized, user-friendly list with play, rename, share, and delete options. • Run smoothly on the current public iOS version and the latest iPhone models without requiring jailbreak. • Handle microphone, speaker, and system audio properly so the other party’s voice is recorded clearly. • Include basic privacy controls (e.g., optional pas...

    $186 Average bid
    $186 Avg Bid
    60 bids

    I need a complete VoIP call-center setup that plugs seamlessly into my Bitrix24 account. The platform must handle 20 simultaneous users split between Sales and Customer Support while remaining easy for agents to learn and inexpensive to run. Key requirements • Tight Bitrix24 integration: click-to-call, screen-pops, automatic CRM logging, live dashboards and wallboards viewable inside Bitrix24 so supervisors can track queue metrics in real time. • Multilingual handling: English and Polish ready at launch, with the system structured so a third language can be added without major rework. • AI assistance: automatic call summarisation pushed to the CRM record after every interaction plus an inline quality-control engine that flags poor audio or network issues and scores ca...

    $7244 Average bid
    $7244 Avg Bid
    70 bids

    Outbound Telemarketing Project $250 per Sale . Online IT Academy is offering a performance-based outbound telemarketing project for Indian call centers. Project Details: Commission: $250( incentives including) per confirmed enrollment Product: Elite online IT & AI training programs (Data Science, AI/ML, Cybersecurity, Blockchain, etc.) Target Regions: USA Requirement: Own CRM, VOIP/dialer, scripts, QA, and trained outbound team We are looking for serious, professional BPOs capable of: Handling cold calls, pitching, objection handling, and closing high-ticket enrollments Maintaining quality standards and performance accountability Managing their own infrastructure and processes Why Partner: High commission per successful enrollment Premium product with excellent closing p...

    $2088 Average bid
    $2088 Avg Bid
    1 bids

    I need a friendly voice on the phone to reach out to healthcare professionals, share concise product details, and handle light follow-up calls. You will work from a clear, pre-written script and I’ll walk you through it first, so no deep sales background is required—students and freshers regularly succeed on this campaign. Here’s what the day-to-day looks like: • Call the provided list of doctors, nurses, and clinic managers. • Use the script to explain the medical product and answer basic questions about its features only; pricing and in-depth service benefits are handled by me later. • Note call outcomes in a simple tracker and schedule any agreed follow-up calls. • Forward hot leads immediately so I can continue the conversation. I supply: t...

    $263 Average bid
    $263 Avg Bid
    5 bids

    I am seeking a native Spanish speaker from Latin America who is capable of handling both live chat and phone inquiries with a high level of professionalism and consistency. This is a fully remote position requiring a commitment of 48 hours per week. The first week will serve as a paid trial period to ensure a smooth and effective collaboration. Key Responsibilities: Provide courteous and professional assistance to customers in Spanish via live chat and VoIP calls. Accurately identify customer needs, clarify inquiries, and resolve issues efficiently. Follow the scripts and step-by-step guidelines provided. Maintain a concise activity log at the end of each shift, including resolved cases and any required follow-ups. Requirements: Native-level Spanish proficiency from a Latin American co...

    $137 Average bid
    $137 Avg Bid
    15 bids

    I’m putting together an outbound calling operation focused exclusively on business-to-business sales. The core of the job is simple: reach the right decision-makers, pitch our offer confidently, and document every conversation. A call-recording capability is non-negotiable because I need to review interactions for quality control and training. If you already run with tools like Aircall, RingCentral, Five9, or a comparable VoIP stack that stores recordings securely, let me know; I’m open to whichever platform you prefer so long as recordings are easy for me to access and download. Here’s what I’m expecting you to handle: • Place outbound sales calls to a list of qualified businesses I’ll supply. • Log basic call outcomes (connected, voicemai...

    $424 Average bid
    $424 Avg Bid
    16 bids
    Complete PBX.im Setup Needed
    1 day left
    Verified

    I need a seasoned VoIP specialist to take my deployment from zero to fully operational. I will not be supplying configuration files, trunks, numbers, or even the initial account—everything has to be sourced, built, and verified by you. The finished system must speak SIP end-to-end so that soft-phones, desk phones, or mobile clients can register and place calls immediately after hand-over. I expect you to: • Create or configure the account, secure it, and document all access credentials. • Provision at least one SIP trunk or equivalent solution so the platform can dial in and out of the public network. • Set up a clean dial plan with working inbound and outbound routes and test calls in both directions. • Provide two sample SIP extensions (one desktop, on...

    $105 Average bid
    $105 Avg Bid
    28 bids
    Urgent 3CX USA SIP Trunk
    1 day left
    Verified

    I need a working U.S.–based SIP trunk that plugs straight into my existing 3CX PBX, and I need it online immediately. This is for a live business system, so downtime is not an option. Here’s what I am expecting from you: • Provide a fully-provisioned SIP route (inbound and outbound) that registers successfully with 3CX and passes test calls. • Supply clear configuration details—host, authentication, codecs supported, 911 compliance, and any DID options—so I can import them quickly. • Hand over written step-by-step instructions or a short screen-share session for final cut-over. Please respond only if you can deliver right away. Include a detailed proposal outlining the solution you will supply, how you will integrate with 3CX, and your est...

    $98 Average bid
    $98 Avg Bid
    47 bids

    I run a service business that requires precise, daily coordination of cleaning appointments. I’m looking for someone who can take full ownership of our scheduling and calendar management inside Connecteam, while also handling the back-and-forth communication with both clients and our field teams. Here’s what the role looks like day to day: every morning you’ll review incoming requests, confirm availability with our cleaners, and slot jobs into the calendar. Throughout the day you’ll monitor any changes, quickly update Connecteam, and notify everyone affected. When clients call, email, or message, you’ll answer questions, reschedule if needed, and make sure service providers have the latest details so no one shows up at the wrong time or address. Deliverables...

    $9 / hr Average bid
    $9 / hr Avg Bid
    12 bids

    We are looking for an experienced AI Automation Specialist to build a fully automated, white-labeled sales and lead-management ecosystem integrating Conversational AI, Voice Calling, Messaging, Email Automation, and CRM workflows. The ideal candidate should have strong expertise in AI Voice platforms, workflow automation, API integrations, and multi-channel lead orchestration. Project Scope 1. Unified Lead Management * Build a centralized lead management hub * Capture inbound leads from: * Website forms * B2B marketplaces * Social media platforms * Integrate via APIs and webhooks * Automatically categorize and route leads 2. Voice AI Configuration * Configure high-quality conversational AI voice agents * Support regional accents and natural conversations * Set up inbound an...

    $109 Average bid
    $109 Avg Bid
    32 bids

    Estoy en búsqueda de un hablante nativo de español de América Latina que sea capaz de atender tanto consultas por chat en vivo como por teléfono con un alto nivel de profesionalismo y constancia. Se trata de un puesto completamente remoto que requiere una dedicación de 48 horas semanales. La primera semana funcionará como un período de prueba remunerado para asegurar una colaboración eficiente y fluida. Responsabilidades principales: Brindar atención cordial y profesional a los clientes en español a través de chat en vivo y llamadas VoIP. Identificar con precisión las necesidades del cliente, aclarar sus consultas y resolver incidencias de manera eficiente. Seguir los guiones y las instrucciones paso a pa...

    $161 Average bid
    $161 Avg Bid
    6 bids

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