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!

Από 24,091 αξιολογήσεις, οι πελάτες αξιολογούν τους VoIP Developers με 4.8 από 5 αστέρια
Πρόσλαβε 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!

Από 24,091 αξιολογήσεις, οι πελάτες αξιολογούν τους VoIP Developers με 4.8 από 5 αστέρια
Πρόσλαβε VoIP Developers

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    17 εργασίες βρέθηκαν
    Odoo 15 Setup & MySQL Integration
    6 μέρες left
    Βεβαιωμένο

    I am rolling out a fresh Odoo 15 instance and need the CRM, Project Management and VoIP modules fully configured for daily production use. Also would like to see how to implement a custom bridge between Odoo and our in-house MySQL database: data must flow reliably in both directions so that accounts, tickets and call logs stay perfectly in sync with our legacy systems. Deliverables • Configured CRM, Project and VoIP modules ready for use • A working, documented MySQL connector (source code in a Git repo) • Basic test data proving two-way sync and error handling • A short hand-off guide so my team can maintain the linkage I’ll provide SSH access to a vanilla Odoo 15 server and the MySQL schema. Let me know your estimated timeline and any clarifying quest...

    €15 / hr Average bid
    €15 / hr Μέση Προσφορά
    141 προσφορές

    I need a reliable virtual assistant to handle customer support calls during Australian business hours. The role is strictly phone-based, so confident, friendly communication and a quiet work environment are essential. You’ll be the first point of contact for our callers—answering questions, noting issues, and updating the relevant record in our cloud CRM while keeping response times short and the experience positive. I would prefer a female, as most of our callers will be mothers wanting information on our kids party and event entertainment service here in Melbourne. Basic call-handling software and a headset are required; familiarity with any standard VoIP tool is a plus. I will supply a clear knowledge base, call flow, and escalation procedures so you can get up to speed qu...

    €7 / hr Average bid
    €7 / hr Μέση Προσφορά
    1 προσφορές

    I need to add real–time Australian driver’s-license verification to my existing VOIP platform immediately. Callers will enter or speak their licence details during the call flow; the system must then query the official Australian DVS (or a comparable API you recommend) and return an instant pass/fail result before the call proceeds. The only document we will accept is a Driver's License, so the solution should extract and validate all standard licence fields—name, address, date of birth, licence number and expiry—while logging a full audit trail for compliance. I am flexible on the underlying VOIP stack, provided the final workflow runs smoothly on my current hosted instance and is maintainable in-house after hand-over. Deliverables • Fully integra...

    €20 Average bid
    €20 Μέση Προσφορά
    7 προσφορές
    AI evaluation and red teaming
    6 μέρες left
    Βεβαιωμένο

    requirements for the AI Evaluation & Voice Testing Platform, Phase 1 — Voice Load Testing & Core Evaluation Platform This phase will include: • Test Suite Dashboard (create/manage evaluation suites) • SIP / API / Webhook connection modes • Voice load testing framework (SIPp based) • Concurrent call simulation (demo scale locally, scalable to 3000 ports on server) • Deterministic flows (scripted IVR tests) • Agentic flows using LLM for dynamic conversations • Retry logic for failed calls • Technical metrics collection (latency, success rate, call failures) • Basic reporting dashboard Phase 2 — AI Evaluation Engine & Red Teaming Includes: • AI evaluation scoring (intent accuracy, entity extraction) • Halluci...

    €105 Average bid
    €105 Μέση Προσφορά
    46 προσφορές
    Reliable Philippine Customer Service VA
    6 μέρες left
    Βεβαιωμένο

    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 3 p.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 responses won’t work for us. I currentl...

    €3 / hr Average bid
    €3 / hr Μέση Προσφορά
    38 προσφορές

    I need a reliable virtual assistant to handle customer support calls during Australian business hours. The role is strictly phone-based, so confident, friendly communication and a quiet work environment are essential. You’ll be the first point of contact for our callers—answering questions, noting issues, and updating the relevant record in our cloud CRM while keeping response times short and the experience positive. I would prefer a female, as most of our callers will be mothers wanting information on our kids party and event entertainment service here in Melbourne. Basic call-handling software and a headset are required; familiarity with any standard VoIP tool is a plus. I will supply a clear knowledge base, call flow, and escalation procedures so you can get up to speed qu...

    €7 / hr Average bid
    €7 / hr Μέση Προσφορά
    8 προσφορές

    I need a confident, clear-spoken caller to reach out to health-insurance agents and spark their interest in our pay-per-call lead generation service. Your task is simple: introduce the concept—live, inbound calls and secure a calendar slot for my closer to take the conversation further. There’s no hard sell or complicated pitch; you’ll be making warm introductions, answering a few top-level questions, and booking the appointment. If you already use a dialer, CRM, or VOIP platform, great—just export the basic call notes so I can track progress. I’m flexible on the actual calendar tool as long as the meeting lands smoothly in my team’s schedule. Deliverables I’m counting on: • Daily call log with contact outcome • Confirmed appointm...

    €4 / hr Average bid
    €4 / hr Μέση Προσφορά
    9 προσφορές

    I am looking for an experienced developer who has strong knowledge of MyOperator APIs and webhook integrations. I am building my own CRM system called Garuda CRM, and I need help integrating MyOperator with it so that call data and actions can be connected directly to my CRM. Key Requirements: Experience working with MyOperator API Experience implementing webhooks Ability to integrate call logs, call events, and call tracking into a custom CRM Configure real-time data flow from MyOperator to Garuda CRM Ensure reliable syncing of incoming and outgoing call data Knowledge of backend integrations (REST APIs, JSON, etc.) Scope of Work: Integrate MyOperator with my CRM Set up webhook endpoints to capture call events Sync call details such as: Caller number Agent details Call stat...

    €7 / hr Average bid
    €7 / hr Μέση Προσφορά
    21 προσφορές
    Build Voice AI Agent for VoIP system
    3 μέρες left
    Βεβαιωμένο

    I have a custom-built VoIP system and now I need a conversational Voice AI agent fully integrated into it. The agent must: • answer common user FAQs with a natural, friendly tone • transfer callers to the appropriate live extension when requests fall outside its scope • record every call and automatically generate accurate, time-stamped transcripts for later review I’ll supply SIP credentials, call-flow diagrams and a small set of example dialogs. You will wire the AI logic into the VoIP stack, expose a simple dashboard or API so I can update FAQs on the fly, and ensure recordings and transcripts are stored in the format my compliance team already uses (WAV + JSON). Completion is accepted when live test calls on my staging server prove that: 1. callers get...

    €1703 Average bid
    €1703 Μέση Προσφορά
    43 προσφορές
    React VoIP Business Platform + API Build
    2 μέρες left
    Βεβαιωμένο

    ONLY BUILD IF YOU HAVE STRONG EXPERIENCE IN THESE AREAS SIP, NAT Traversal, Asterisk/FS, React and strong backend servers scaling. I’m building a browser-based VoIP platform dedicated to business communication and I need an experienced React developer to take it from architecture to live deployment. The entire feature list—covering everything from secure voice and video calling to messaging and call-related utilities—is spelled out in the requirements document I’ve attached, so you’ll have clear, granular guidance from day one. SIP, NAT Traversal, Asterisk/FS Tech expectations You’ll craft a responsive single-page app in React (TypeScript preferred) that connects to a SIP/WebRTC back-end. I’m open to your preferred server stack (Node/Express,...

    €3542 Average bid
    €3542 Μέση Προσφορά
    24 προσφορές

    Admin interface: -Creating carriers: Carrier name, Carrier IPs:Ports (To be allowed where calls to from), Personal Notes. -Adding numbers with CSV File: Range;country;Number;Carrier Payout;Carrier Pay Term;Client Payout;Notes (remarks) -Numbers should be all routed to a local IVR (or a group of IVRs, which will be played randomly) if not allocated to any client. -Numbers page show all details: Range, number, carrier, carrier payout, carrier pay term*, client payout**, to which client it's allocated if it is, and Notes -Search options: search per client allocated numbers, per carrier, per range, per country, per rate (more than or less than or =), per number, etc. -Option to download CSV file numbers of the searched result, or for all if search is reset for all -Select numbers (...

    €103 Average bid
    €103 Μέση Προσφορά
    17 προσφορές

    I want my new AWS account configured to host a USA-based SIP trunk through Amazon Chime. The job includes creating or hardening the AWS environment, provisioning an Amazon Chime Voice Connector, assigning U.S. numbers, and enabling both inbound and outbound calling. The trunk has to register cleanly with our existing on-premise PBX and soft-phone apps, so please allow for SIP signaling tweaks, codec selection, and basic security (TLS, SRTP, firewall rules). Once the link is live, I’ll need brief documentation of the key settings so we can maintain it internally. Deliverables • AWS account prepared with least-privilege IAM roles • Amazon Chime Voice Connector fully configured and licensed for U.S. PSTN access • SIP trunk integrated and test calls completed (in...

    €16 Average bid
    €16 Μέση Προσφορά
    9 προσφορές
    VoIP-CRM Integration Advisory Session
    21 ώρες left
    Βεβαιωμένο

    I run a custom CRM called Ilumino and need an impartial, one-off consultation (about 1–3 hours) to decide which cloud VoIP platform to pair with it. I’m already looking closely at JustCall and Aircall, and my top priority is the strength and flexibility of their API capabilities. The chosen solution must comfortably handle: • Call recording • SMS integration • Analytics and reporting What I expect from our session: you’ll walk me through each platform’s API/webhook structure, outline the real-world pros and cons for a custom CRM like mine, flag any hidden costs or licensing quirks, and help me draft the right technical questions for my Ilumino developers. If you’ve previously connected VoIP tools to bespoke CRMs, especially where detailed...

    €622 Average bid
    €622 Μέση Προσφορά
    23 προσφορές

    I’m looking to have IP cloning / masking configured on my VoIP servers so we can distribute traffic evenly and keep call quality high. Load balancing is the sole objective here—this isn’t about anonymity or region-hopping, just making sure each incoming SIP session finds the least-loaded endpoint without exposing multiple public addresses. The environment is already up and running; what I need is the networking magic that presents one or more virtual IPs while the real servers sit safely behind them. If you normally work with tools such as iptables, nftables, HAProxy, IPVS, BGP anycast, or cloud firewalls, that’s perfect—use whatever combination you trust so long as it’s stable and keeps latency low. Because the phone queues are busy, I need this done ...

    €9 Average bid
    €9 Μέση Προσφορά
    5 προσφορές

    I need to walk through, configure, and fully test an after-hours rule on my RingCentral call queue. Outside of business hours every call should go directly to voicemail, unless the caller flags it as urgent—in that case it must be forwarded instantly to the team lead’s phone. I want this built live with me so I understand each step. Once the escalation path is working, we’ll spend the remainder of the hour fine-tuning other features I use every day, specifically the IVR menu settings and the newer AI receptionist options. A short screen-share session is perfect; one focused hour should cover everything. Deliverables (completed during the call) • Functional call-queue rule that sends after-hours calls to voicemail • Verified urgent-call forwarding to the team...

    €108 Average bid
    €108 Μέση Προσφορά
    4 προσφορές
    Optimize Outbound ViciDial Campaigns
    4 ώρες left
    Βεβαιωμένο

    Hi Vicidial is installed and working. Calls are being made too. Issue is i need to make calls to different campaigns. But it calls to one campaign. Here is work flow I have AI bot that works with vicidial via node bridge. When i make calls from vicidial, it connects to bridge and bridge then finally connects to AI bot. I have created 2 campaigns medicare and final expense. It must dial both campaigns and i must receive calls on both numbers. Currently i can receive call on medicare campaign only. I need to fix this issue. So this job is only for them who can resolve this issue.

    €15 Average bid
    €15 Μέση Προσφορά
    16 προσφορές
    SIP Intercom Station Software
    Λήγει left
    Βεβαιωμένο

    Client needs a VoIP Intercom Station operating in Standards Based SIP. Developer must have experience working with SOC like NanoPI and OrangePI. Developer must meet the following list of requirements so as not to waste our time. Embedded Linux Development Strong experience developing software for embedded Linux systems Experience with custom Linux distributions (Debian/Ubuntu) Kernel configuration, device drivers, and hardware interface support Bootloader and system startup (U-Boot or similar) Experience working with flash-based storage systems Linux system optimization for embedded hardware VoIP / SIP / Networking Experience implementing or maintaining SIP-based communications systems Knowledge of RTP / RTCP media streaming Familiarity with VoIP codecs such as G.711, G.729, Speex Un...

    €1171 Average bid
    €1171 Μέση Προσφορά
    21 προσφορές

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