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!

De 24,591 opiniones, los clientes califican nuestro VoIP Developers 4.8 de un total de 5 estrellas.
Contratar a 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!

De 24,591 opiniones, los clientes califican nuestro VoIP Developers 4.8 de un total de 5 estrellas.
Contratar a VoIP Developers

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    31 trabajos encontrados

    Hiring: Lead QA Automation Engineer – IVR / Contact Center (Remote) Key Skill: Hammer Automation (Mandatory) ***If you have strong IVR testing and Hammer experience, we would like to hear from you***** We are looking for an experienced QA Automation Engineer with strong skills in IVR testing and Hammer to connect with one person and connect with him daily helping work Requirements min 5+ years of experience in IVR / Contact Center testing Strong hands-on experience with Hammer (must-have) Experience with Genesys Cloud or similar platforms Manual and Automation Testing experience API Testing (Postman / Rest Assured) SQL for database validation Experience with Azure DevOps / Jira Knowledge of Agile/Scrum methodology Must be willing to coordinate and work closely with anot...

    €613 Average bid
    €613 Oferta promedio
    13 ofertas

    We are looking for an experienced React Native developer to help build and integrate a VoIP calling SDK into an existing mobile application. This is not a basic app development task. We need someone who has real experience with VoIP / WebRTC / SIP / SDK-level work and can deliver quickly. ### Project Scope - Integrate and extend a React Native VoIP SDK - WebRTC calling using - Inbound & outbound call handling - Push notification based incoming calls - Background call handling - App-based configuration dialing logic - SDK-style packaging + documentation support Our team will handle: - OpenSIPS / SBC (Call logic) - SIP infrastructure - APIs You will handle: - React Native SDK layer - Mobile VoIP calling integration - Native module bridging if required - Call UI handling - Stabili...

    €499 Average bid
    €499 Oferta promedio
    11 ofertas

    Your bid MUST include answers to the 5 questions at the bottom of this posting or it will be immediately rejected. We're a UK-based eSIM and mobile network company launching a branded international calling service. We need an experienced developer to fork, rebrand, and customise the WebTrit Phone open-source softphone app and get it published to both app stores. IMPORTANT: Read this entire posting carefully. There are specific questions at the bottom you MUST answer. Generic proposals will be rejected immediately. What is WebTrit? WebTrit Phone is a Flutter/Dart softphone app that uses WebRTC for voice and video calling. It connects to SIP-based VoIP systems via a REST API. The full source code is available on GitHub. What We Need Done Phase 1 — Fork & Rebrand Fork the Web...

    €446 Average bid
    €446 Oferta promedio
    62 ofertas

    I’m looking for help securing one United States VoIP DID that plugs straight into my existing PBX so our support team can start taking customer calls right away. The number must be fully functional for both inbound and outbound traffic and delivered with clear SIP credentials I can drop into my system without extra hardware. You’ll handle everything—from sourcing a reliable carrier, activating the line, and confirming it registers cleanly on my PBX—to ensuring call quality meets normal business-class standards. If you can bundle extras such as voicemail, call recording, or simple forwarding rules, let me know; they aren’t mandatory but would be appreciated. Once the line shows registered and I can place and receive live test calls, the job is done.

    €14 Average bid
    €14 Oferta promedio
    9 ofertas

    I'm looking for a skilled developer to create a customer service voice agent using Eleven Labs technology. The agent will primarily handle answering queries. The voice agent needs to be integrated into the following platforms: - Phone system - Website - Mobile app Ideal Skills and Experience: - Experience with Eleven Labs voice technologies - Proficiency in voice agent development - Strong integration skills for multiple platforms - Background in developing customer service solutions

    €39 Average bid
    Local
    €39 Oferta promedio
    1 ofertas

    Hi, I want to redesign only agent UI, not admin. See attached. ONLY BID IF YOU HAVE REDESIGN VICIDIAL AND SHOW ME PROOF

    €21 / hr Average bid
    €21 / hr Oferta promedio
    5 ofertas

    I need my new JustCall workspace created and ready to call today. The job is straightforward: register a fresh JustCall account under the details I’ll provide, secure a brand-new U.S. number, and confirm that both inbound and outbound calls work. You’ll handle the entire sign-up flow, any required ID or billing verification, and the quick configuration steps so I can log in and start dialing immediately—no number porting involved, just a clean setup. Deliverables • Active JustCall account in my name • New U.S. phone number attached and tested • One-page hand-off note showing where to adjust voicemail, business hours, and call-forward settings, plus proof that calls connect Experience with JustCall’s U.S. provisioning is essential since I’...

    €11 Average bid
    €11 Oferta promedio
    5 ofertas
    Microsoft Teams Calling Setup
    6 días left
    Verificado

    I’m unable to activate Microsoft Teams voice services from my current region, so I’m looking for someone who can quickly get a Teams account up and running with outbound calling to Europe. The account will be used strictly for voice—no file storage, messaging, or other workloads—so the focus is on provisioning the right license, enabling the Phone System add-on, assigning a number, and verifying that calls to European landlines and mobiles complete successfully. The account should have a business phone plan. What matters the most is that, once you’re done, I can sign in from my own desktop and mobile Teams apps, dial any European number, and experience clear audio. Deliverables: • A working Microsoft Teams tenant with voice calling enabled • One ...

    €205 Average bid
    €205 Oferta promedio
    20 ofertas

    I’m looking for a reliable ViciDial pro who can jump in each day and keep my dialer running smoothly. The core of the job is straightforward but must be done consistently: • Run the standard performance and list-based reports I specify, download them, and drop them in our shared folder before end of day. • Import new lead files (CSV) as they arrive, map fields correctly, and verify the list is live. • Check that every active campaign’s leads are sitting in the hopper in the right quantities so agents never run dry. If a hopper is empty—or about to be—top it up and ping me in Slack. Everything is handled remotely; you’ll just need a stable connection, a headset for quick follow-up calls if questions arise, and solid familiarity with the Vic...

    €4 / hr Average bid
    €4 / hr Oferta promedio
    9 ofertas
    Daily ViciDial Voip Admin Support
    6 días left
    Verificado

    I’m looking for a reliable ViciDial pro who can jump in each day and keep my dialer running smoothly. The core of the job is straightforward but must be done consistently: • Run the standard performance and list-based reports I specify, download them, and drop them in our shared folder before end of day. • Import new lead files (CSV) as they arrive, map fields correctly, and verify the list is live. • Check that every active campaign’s leads are sitting in the hopper in the right quantities so agents never run dry. If a hopper is empty—or about to be—top it up and ping me in Slack. Everything is handled remotely; you’ll just need a stable connection, a headset for quick follow-up calls if questions arise, and solid familiarity with the Vic...

    €17 / hr Average bid
    €17 / hr Oferta promedio
    7 ofertas

    I’m completing a networking and security module at school and the current assignment requires a fully-configured Cisco Packet Tracer project. If you’ve tutored or prepared Packet Tracer or such kind of assingment please help me

    €9 / hr Average bid
    €9 / hr Oferta promedio
    21 ofertas
    Sales Follow-Up Call Specialist
    4 días left
    Verificado

    I have a queue of existing customers who recently made an enquiry or purchase, and each of them needs a prompt, friendly follow-up call. The goal is to advance the sale while gathering two key pieces of intel: (1) their current interest level and (2) any candid feedback they have about our product or service. You’ll receive a clear script and talking points from me before you begin, yet you are free to adapt your tone so the conversation feels natural rather than read. All contacts already know our brand—no cold pitching here—so your focus is on relationship building, answering simple questions, and confirming next steps. After every conversation, log the outcome in our shared Google Sheet so I can see at a glance where each customer stands and what they told you. De...

    €16 / hr Average bid
    €16 / hr Oferta promedio
    66 ofertas

    Need an experienced s specialist to configure our SIP and PRI trunks I will provide remote access to the server and trunk credentials once we agree on the approach. Looking forward to working with someone who can get this running quickly and cleanly. Asterisk PBX Linux SIP Software Architecture,Engineering VoIP

    €191 Average bid
    €191 Oferta promedio
    9 ofertas
    UAE Business VoIP Number Needed
    4 días left
    Verificado

    I need UAE number for VOIP call inbound and outbound call, do you know which provider is best for this ? or you can provide us this service ?

    €140 Average bid
    €140 Oferta promedio
    2 ofertas

    I need an experienced telephony engineer to bring up a new IVR on our Asterisk-based server that will answer calls coming in on both a SIP trunk and a PRI. The core requirement is a clean, dependable call-routing tree—callers should reach the right destination every time—with call recording and basic, built-in reporting turned on from day one. Environment • Linux box already running Asterisk (remote SSH available) • One SIP trunk + one PRI (credentials and circuit details ready) Scope of work 1. Configure the IVR in Asterisk, activate call routing options, and confirm that both trunks follow the same logic. 2. Enable call recording for all menu paths, store files locally in an organised directory structure, and verify playback. 3. Turn on the stock call‐...

    €212 Average bid
    €212 Oferta promedio
    3 ofertas
    Cold Callers for Web Dev Sales
    4 días left
    Verificado

    I run a growing website-development agency and have compiled a database of cold leads—mainly owners of small businesses spread across several countries. Your mission is to pick up the phone, engage these prospects, and turn curiosity into signed development projects. You will receive: • A regularly updated spreadsheet of verified cold leads (names, phone numbers, business URLs, and brief notes). • A concise call script highlighting our core offers: custom WordPress sites, redesigns, and maintenance packages. • Login to our cloud CRM (HubSpot) to track each interaction. What I need from you: • Confident, fluent phone outreach during the prospects’ local business hours. • Accurate, same-day CRM updates—status, call notes, next steps. &...

    €116 Average bid
    €116 Oferta promedio
    24 ofertas

    We are an Ontario-based automotive dealership and leasing company looking for a skilled Lead Generation & Appointment Setting Specialist. Your role will include both: Generating qualified leads Calling or email and texting incoming leads from existing source. Calling and booking appointments from inbound and outbound leads This is a long-term role for someone who can consistently deliver real buyer leads. Responsibilities Lead Generation Find potential customers actively looking for vehicles or leasing options through: Facebook Marketplace AutoTrader & CarGurus inquiries Local buy/sell groups Instagram or WhatsApp outreach Collect lead details: Name Phone number Vehicle interest Budget Location Lead Qualification & Calling Call leads using our Canadian VoIP ...

    €4 / hr Average bid
    €4 / hr Oferta promedio
    21 ofertas

    We need a developer to build a real-time voice transformation application that changes our voice during live phone calls (both inbound and outbound) using the ElevenLabs Speech-to-Speech API. What We Need: The app should capture microphone input, stream it to the ElevenLabs voice changer API, and route the transformed audio back through a virtual audio device (like VB-Cable or VoiceMeeter) so it can be used as a microphone input for any calling app — Zoom, Google Voice, Teams, RingCentral, or any softphone. Key Requirements: Real-time voice transformation with minimal latency (target sub-500ms) Works with any phone/calling application via virtual audio device Supports both inbound and outbound calls Simple desktop GUI with voice selection, on/off toggle, and audio level meters Abil...

    €19 / hr Average bid
    €19 / hr Oferta promedio
    117 ofertas

    I have a growing list of candidates who have already applied through our recruitment portal; now I need a personable caller to take the conversation further. Your task is simple but crucial: telephone each applicant and guide them through my pre-written 10-step questionnaire so we can capture deeper insight into their qualifications and experience. I will supply: • Daily call list with direct phone numbers and time-zone notes • The scripted questionnaire and answer key • A cloud sheet (Google Sheets / Excel 365) where you can log every response immediately after each call • Voip logins for calling with transcripts of the calls... so you wont need to make any data entry. What I need from you: • Professional, friendly phone manner and clear native English &bu...

    €14 / hr Average bid
    €14 / hr Oferta promedio
    30 ofertas
    AV Sound System Setup
    3 días left
    Verificado

    I'm looking for an experienced AV installer to set up a sound system in my Pilates/Lagree reformer studio. The system should include microphone integration and six pendant speakers, and be compatible with headsets. It needs to be hardwired with an auto interface. Requirements: - Professional installation of sound systems - Experience with microphone integration - Knowledge of pendant speaker setup - Ability to ensure headset compatibility - Hardwired system installation Ideal skills include AV installation, technical knowledge of sound systems, and previous experience in fitness studio setups. Please provide examples of similar work.

    €2266 Average bid
    Local
    €2266 Oferta promedio
    3 ofertas

    PROJECT DESCRIPTION Context I'm looking for an experienced developer to build an intelligent call center system with automatic real-time voice translation. The project aims to enable agents in India (English speakers) to receive and handle calls from French customers, with instant bidirectional translation. Objective Create a complete solution that enables: Receiving incoming calls on a French number (OVH Telecom) Real-time voice translation French ↔ English/Hindi Automatic transfer to agent Latency < 1 second GDPR compliant (EU region) REQUIRED TECH STACK Backend Node.js (v20+) for HTTP server WebSocket (ws) for real-time audio streaming PM2 for process management APIs & Services OVH Telecom: VoIP telephony (REST API) Deepgram Nova-2: Speech-to-Text (French & E...

    €1473 Average bid
    €1473 Oferta promedio
    45 ofertas
    ASTPP Rates & Prefix Setup
    3 días left
    Verificado

    I need an expert to help me configure billing rates and internal prefixes in my ASTPP installation. Tasks: Import and set up billing rate cards. Configure internal prefixes for specific routing rules. Ensure the billing engine is capturing data correctly. This is a straightforward task for someone who knows ASTPP well. Please bid only if you have worked with ASTPP before and can start immediately.

    €22 Average bid
    €22 Oferta promedio
    29 ofertas

    I have a growing list of candidates who have already applied through our recruitment portal; now I need a personable caller to take the conversation further. Your task is simple but crucial: telephone each applicant and guide them through my pre-written 10-step questionnaire so we can capture deeper insight into their qualifications and experience. I will supply: • Daily call list with direct phone numbers and time-zone notes • The scripted questionnaire and answer key • A cloud sheet (Google Sheets / Excel 365) where you can log every response immediately after each call • Voip logins for calling with transcripts of the calls... so you wont need to make any data entry. What I need from you: • Professional, friendly phone manner and clear native English &bu...

    €2177 Average bid
    €2177 Oferta promedio
    38 ofertas

    Hiring Full Stack Developer / Agency for AI-Powered White Label Loan SaaS Platform We are building a complete AI-enabled fintech loan platform with white label SaaS model, automation, CRM, and tracking system. Looking for an experienced developer or team to build the full product end-to-end. User Mobile App (Android & iOS) • Secure OTP login & consent flows • Personal Loan enquiry • Free CIBIL check + paid CIBIL repair consultation • EMI Calculator & Debt Consolidation • AI Chat Loan Assistant (Groq API) • Payment gateway integration • Multi-language ready Website (Same as App) • All loan modules • AI chat • Lead sync with CRM • UTM tracking support AI Chat System • Smart user qualification • Auto lead cr...

    €2153 Average bid
    €2153 Oferta promedio
    82 ofertas

    Cold Caller / Appointment Setter – Roofing Only (Overseas Freelancers) We are a U.S.-based roofing company hiring experienced overseas cold callers to set roof inspection appointments for homeowners with verified storm damage. Roofing only. No solar. No other home services. ⸻ Who This Is For • Freelancers outside the U.S. • Fluent English required • Spanish is a strong plus • Proven cold-calling AND appointment-setting experience is REQUIRED • Home services experience preferred (roofing strongly preferred) ⸻ Job Overview You will be calling homeowners from storm-damage addresses pulled from Doorknocker. Roof damage has already been identified from the street, making these qualified cold calls — not random dialing. Addresses will be provided...

    €227 Average bid
    €227 Oferta promedio
    71 ofertas

    Need an experienced telephony specialist to configure a IVR that works on both our SIP and PRI trunks with all recording and basic reporting enabled . I will provide remote access to the server and trunk credentials once we agree on the approach. Looking forward to working with someone who can get this running quickly and cleanly.

    €90 Average bid
    €90 Oferta promedio
    8 ofertas
    FreePBX Calls
    1 día left
    Verificado

    Our FreePBX (Astersik) System is rejecting inbound calls and unable to make outbound calls. System uses Laravel UI with PBX system. Telnyx says that problem is with our system. So who is expert to fix it in few clicks? Thank you

    €30 Average bid
    €30 Oferta promedio
    31 ofertas

    I need a freelancer to install and configure Issabel and the Issabel Contact Center module on a ready-to-use CPU server. Requirements: - Install on a CPU server -Install dialer configure it (Predictive, Progressive,manual dialing and voice broadcasting) - Configure Issabel and Contact Center module - Server is ready; no setup needed - Operating system is currently none; should be installed as part of the task Ideal Skills & Experience: - Experience with Issabel and contact center setups - Proficient in server installations, especially on CPU servers - Familiar with Linux operating systems Looking forward to your bids! Freelancer from India, Nepal, Bangladesh , Srilanka will preferred Instead of Bidding, also make sure you "DM"

    €74 Average bid
    €74 Oferta promedio
    11 ofertas

    Ich möchte unsere bisherige analoge Telefonanlage in unserem KMU vollständig auf eine selbst gehostete VoIP-Lösung umstellen. Als Herzstück soll ein Asterisk-Server laufen, den wir in unserer eigenen Infrastruktur betreiben. Rund 11 – 50 Mitarbeitende werden die neue Anlage täglich nutzen. Folgende Kernfunktionen sind zwingend erforderlich: • Anrufweiterleitung • Voicemail • Konferenzschaltung Alle bestehenden Rufnummern sollen nahtlos portiert und auf der neuen Plattform weitergeführt werden. Neben der eigentlichen Installation erwarte ich eine kurze Dokumentation der Systemarchitektur, eine verständliche Anleitung für zukünftige Erweiterungen sowie einen Testlauf, bei dem alle Funktionen live verifiziert werden. W...

    €1072 Average bid
    €1072 Oferta promedio
    11 ofertas
    UAE VoIP Number buy
    9 horas left
    Verificado

    I need an experienced telecom professional to secure and activate a legitimate UAE business VoIP number for my company. I’m looking for guidance from selection to live testing, so the scope covers: • Recommending a reputable UAE-compliant provider that can issue a local DID in my company’s name • Handling any paperwork or TRA registration that a foreign-owned or mainland business must complete • Purchasing the number on my behalf, or walking me through the exact purchase steps if the provider requires my direct action • Supplying SIP credentials (or portal access) and confirming that inbound calls ring through to my existing phones/softphones • Sharing a concise setup guide so I can edit call-forwarding rules, voicemail greetings and future rou...

    €165 Average bid
    €165 Oferta promedio
    2 ofertas

    I’m looking for an experienced Power Pages consultant to work with me on an existing Dataverse setup, not a greenfield build. This is an external-facing Power Pages portal whose sole purpose is secure data submission and management into existing custom Dataverse tables. Existing setup (must be reviewed first) Three custom Dataverse tables already exist Relationships are already defined (parent + related child tables) Your first task will be to: * Review the current table structure * Validate relationships, columns, data types, and ownership * Flag any required changes upfront before portal configuration begins * No assumptions. No silent refactoring. Scope of work You will: * Configure a Power Pages site connected to my existing Dataverse tables * Surface a main parent f...

    €2 - €7 / hr
    Sellado
    €2 - €7 / hr
    13 ofertas

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