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!

На підставі 24,486 відгуків клієнтів, рейтинг VoIP Developers становить 4.83 із 5 зірочок.
Найняти 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!

На підставі 24,486 відгуків клієнтів, рейтинг VoIP Developers становить 4.83 із 5 зірочок.
Найняти VoIP Developers

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    Статус роботи
    13 знайдені роботи

    I need a remote assistant who can confidently handle both phone and WhatsApp interactions in English. Most of the work revolves around customer support, specifically technical questions about our product line. You’ll be answering inbound calls, placing the occasional follow-up call when a ticket needs clarification, and replying to written WhatsApp queries in real time. Our in-house knowledge base, call scripts, and WhatsApp templates are ready for you; what I need is your clear, friendly voice, solid technical-troubleshooting mindset, and the discipline to document each interaction in our CRM before closing the ticket. Key things to know • The audience is English-speaking customers only. • All calls are customer-support in nature—no sales or appointment setting...

    $148 Average bid
    $148 Сер. заявка
    32 заявки
    Kamailio VoIP Setup
    6 дні(-в) left

    I need a new Kamailio setup primarily for VoIP call routing. This setup should support SIP and WebRTC protocols. Key Requirements: - Configure Kamailio for VoIP call routing - Support for SIP and WebRTC protocols - Detailed documentation of the setup Ideal Skills and Experience: - Expertise in Kamailio - Strong knowledge of VoIP, SIP, and WebRTC - Experience with system configuration and documentation

    $1950 Average bid
    $1950 Сер. заявка
    27 заявки
    Twilio–Salesforce Integration & SFMC Email
    1 година left
    Верифіковано

    I need my Salesforce org fully connected to Twilio so that customer outreach can happen directly from standard objects. The end-to-end integration should let me trigger and track communications—primarily SMS, with the option to expand to voice or other Twilio messaging services later—without leaving Salesforce. Please handle the Twilio Console setup, API keys, named credentials, Apex or Flow logic, and whatever package configuration is required so everything is authenticated, tested, and ready for production. Alongside the integration, I want SalesForce Marketing Cloud prepared for immediate use. The initial priority is email campaign creation: building reusable templates, setting up sender authentication, configuring send classifications, and making sure campaigns can be laun...

    $117 Average bid
    Терміновий
    $117 Сер. заявка
    38 заявки
    Reliable Philippine Customer Service/ Virtual Assistant -- 3
    5 дні(-в) left
    Верифіковано

    YOU MUST BE FROM THE PHILIPPINES TO APPLY! Pay is $4/hour. Only respond if you agree to this pay rate. I run a small U.S.-based operation that needs hands-on help with day-to-day customer interactions. From 12 p.m. to 5p.m. Eastern (that’s 12 a.m.–3 a.m. Manila time), I receive a steady flow of inbound calls and emails, plus occasional outbound follow-ups, and I want every contact handled promptly and professionally. During that three-hour window you will: • answer incoming calls and place quick outbound callbacks when required, • reply to customer emails in a friendly, concise tone, and • keep our live-chat widget active so no visitor waits more than a minute. A rock-solid, high-speed internet connection is essential—dropped calls or slow chat r...

    $6 / hr Average bid
    $6 / hr Сер. заявка
    24 заявки
    Cold Calling VoIP Leads
    5 дні(-в) left
    Верифіковано

    I’m launching a focused cold-calling push aimed at medium-sized enterprises to create qualified leads for our VoIP phone service. Your job is to pick up the phone, introduce the solution, and secure interest strong enough for a follow-up demo with our sales engineer. You’ll work from a concise script highlighting cost savings, reliability, and scalability of our cloud-based VoIP platform, yet you’re free to adapt your tone so the conversation feels natural. A starter list of target companies is ready; as calls progress I’ll rely on you to keep notes in the shared CRM and flag any data gaps you uncover so we can refine the list together. Deliverables I need from you • Daily call log with outcome codes (connected, voicemail, gatekeeper, etc.) • A sprea...

    $175 Average bid
    $175 Сер. заявка
    19 заявки
    Implementación Yeastar P-Series Caracas
    5 дні(-в) left
    Верифіковано

    En nuestra correduría de seguros estamos migrando todo el flujo de voz a una PBX Yeastar P-Series (Appliance Edition) y necesito a un especialista —o empresa— que la ponga en marcha de forma llave en mano aquí en Caracas y luego brinde soporte continuo. Lo que quiero lograr • 16 usuarios iniciales del equipo comercial operando sobre la nueva central. • Gateways Yeastar GSM (serie TG) y FXO (serie TA) correctamente enlazados. • Grabación de llamadas siempre activa para auditoría de calidad. • Integración nativa con HubSpot CRM Enterprise: registro automático de llamadas, click-to-call e identificación inmediata de contactos. Lo que valoro • Experiencia avanzada con la serie P comprobable en insta...

    $361 Average bid
    $361 Сер. заявка
    13 заявки
    Healthcare Call Center Optimization Consultant
    3 дні(-в) left
    Верифіковано

    We are a healthcare organization in Saudi Arabia looking for an experienced consultant to review and improve our call center operations. Current issues include: * Missed calls * Abandoned calls * Queue performance problems * Ineffective call routing * Reporting and KPI visibility challenges We are prioritizing candidates with: - Healthcare call center experience in Saudi Arabia and the GCC region - Experience supporting Arabic-speaking environments - Expertise in PBX, queue management, call routing, and CRM integrations We are specifically seeking consultants who have diagnosed and improved real healthcare call center operations. General AI developers are not a focus for this role. Please provide examples of similar projects you have completed.

    $455 Average bid
    $455 Сер. заявка
    17 заявки

    I'm looking for an experienced VoIP/SIP developer (or small team) to build a cross-platform SIP client supporting both peer-to-peer calls and video conference joining, with no mandatory registration (registration support required but optional at runtime). Core requirements: 1:1 P2P SIP calls without registration, plus ability to join video conferences regardless of the conferencing platform Audio + video with these codecs: Video — H.264, H.265; Audio — Opus, G.711, G.722, G.729 (G.729 if licensing permits) BFCP for screen sharing Participant list retrieval (including a proxy approach to read participants from the backend if needed) Optional SIP registration (built in for future use) Platforms: iOS, Android, Windows, macOS Preferred stacks: PJSIP or baresip — propose...

    $13818 Average bid
    $13818 Сер. заявка
    140 заявки
    Configurar SIP Trunk no 3CX
    3 дні(-в) left
    Верифіковано

    Tenho um PABX VoIP 3CX já instalado na versão 20. O SIP Trunk encontra-se ativo em uma linha dedicada baseada em IP e a conexão é uma ligação dedicada de alta velocidade. Eu conheço o processo em teoria, mas ainda não fiz essa configuração na prática. Preciso que você: • Crie o tronco SIP no 3CX, inserindo as credenciais fornecidas pelo meu provedor. • Ajuste codecs, autenticação e rotas de entrada/saída. • Teste chamadas internas, externas e DIDs para garantir qualidade de áudio e registro estável. • Documente cada etapa (prints ou texto breve) para que eu possa replicar ajustes futuros. O acesso remoto ao servidor 3CX e aos dados do provedor ...

    $22 Average bid
    $22 Сер. заявка
    13 заявки
    Calling Issue Resolution in Flutter App
    1 день left
    Верифіковано

    Flutter Calling App (Customer Listener) Tech Stack Flutter Mobile App Node.js Backend ZEGOCLOUD Voice/Video Calling SDK Firebase Cloud Messaging (if implemented) Issue Description The app allows Customers to call Listeners using ZEGOCLOUD. The call works when both users are actively using the app. However, when the Listener app is in the background or the device is locked, incoming calls are not being received consistently. Expected Behaviour Listener receives incoming call when app is open. Listener receives incoming call when app is minimized. Listener receives incoming call when phone screen is locked. Listener can accept/reject directly from incoming call screen. Call notifications should work reliably on Android and iOS. Areas to Investigate Flutter Side Zego Call Invitation Service i...

    $16 Average bid
    $16 Сер. заявка
    15 заявки

    I’m ready to roll out a brand-new GoAutoDial environment and want everything done right from day one. The scope is truly end-to-end: • Clean installation of the latest stable GoAutoDial build on my VPS • SIP trunk integration so inbound and outbound calls flow without a hitch • Predictive dialer configuration tuned for optimum call pacing and drop-rate compliance • IVR menus designed to fit my current call-flow map • Campaigns set up with lists, scripts, dispositions, recordings and time-zone rules • Security hardening—firewall rules, fail2ban, strong passwords, and best-practice service lockdown I’ll provide server access, SIP credentials, and any brand materials needed for prompt recordings. When you’re done I expect a...

    $296 Average bid
    $296 Сер. заявка
    3 заявки

    We need an expert to link our main HQ (Grandstream PBX + Synology NAS) with two remote branches (VPN). ​Core Tasks: ​Site-to-Site VPN: Implement encrypted VPN tunnels between HQ and branches. Must support VPN Obfuscation/Stealth techniques to bypass VoIP blocking and DPI in a restricted international location. ​PBX Integration: Add remote extensions to our existing production Grandstream PBX and configure seamless call routing. ​NAS Sync: Integrate remote WD My Cloud storage with HQ Synology NAS using GoodSync over internal VPN. ​QoS Optimization: Implement traffic shaping to prioritize VoIP/SIP packets over file synchronization. ​Requirements: ​Expert-level knowledge of MikroTik/Fortinet (VPN/Routing), Grandstream PBX, and Synology NAS. ​Proven track record of bypassing network restrictio...

    $546 Average bid
    $546 Сер. заявка
    27 заявки

    I need an experienced English-speaking sales caller to handle outbound calls to warm and cold prospects. Your goal on each call is to introduce the offer, qualify interest, and move the contact to the next step in the funnel—whether that is booking a demo, closing a small initial sale, or collecting the necessary data for me to follow up. All conversations must be recorded in full. Clear, well-labeled audio files along with concise call notes should be delivered at the end of each workday so I can review performance and customer feedback. You may use your own VoIP or dialer platform as long as it produces reliable recordings; if needed, I can provide access to my preferred system and CRM. Key deliverables: • Daily batch of call recordings (MP3 or WAV) • Brief log for ev...

    $110 Average bid
    $110 Сер. заявка
    8 заявки

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