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 26,323 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 26,323 reviews, clients rate our VoIP Developers 4.82 out of 5 stars.
Hire VoIP Developers

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    17 jobs found

    We are looking for 2 reliable remote callers to handle personal-injury intake calls for our Texas campaign. We provide fresh prospect data with the client's name, phone number, vehicle details, and exact accident date/time. Your job is to call, qualify the prospect, and live-transfer qualified, ready-to-move-forward clients to our intake attorneys. Requirements: * Fluent English and Spanish * Excellent communication and phone skills * Experience with personal injury intake, legal intake, or paralegal work preferred * Vicidial experience is a strong plus * Able to follow a script while building genuine rapport * Confident handling questions and objections * Reliable internet and a good headset Schedule: 8 AM - 12 PM Central Time We are also open to part-time paralegals with perso...

    $26 / hr Average bid
    $26 / hr Avg Bid
    3 bids

    I’m looking for a friendly, fluent-English telecaller who can step in a few hours each day and take great care of our existing customers. Your role is strictly customer support—no cold sales—so the focus will be on answering general service questions, guiding callers through basic processes, noting feedback, and making sure every conversation ends on a positive note. You’ll work from a call list I provide, use our cloud-based CRM to log interactions, and handle calls through our VoIP dialer. Training materials, a call script outline, and escalation contacts are all ready; what I need is your clear voice, active listening, and knack for resolving everyday issues quickly. Typical shift requirements sit at 3–4 hours, Monday to Friday, with some flexibility to s...

    $17 / hr Average bid
    $17 / hr Avg Bid
    10 bids

    I work for a large accounting membership organisation and we ideally need a team of people that can enrich two databases. Task 1 We need to identify the current employer of 35,000 existing members, this can be done either telephonically or scraping various platforms online. Ideally have the company name AND the key finance contact at the organisation. Task 2 We also need to identify the primary contact of a separate group of about 40,000 current employers who have employees that are members at our organisation. We know who the employers are but we just need to identify the key finance contact at that employer and we need to ask for their consent for further communications. Task 2 will require telephonic contact, and ideally multiple attempts across each employer. The contacts for this ...

    $14751 Average bid
    $14751 Avg Bid
    32 bids

    # TelesalesOS — Telnyx Telephony/ACD Contact Center Developer Our stack is , React, TypeScript, Supabase/Postgres/Auth/Realtime, Vercel and GitHub. We need an experienced programmable-voice/contact-center developer to build the Telnyx-powered telephony portion. This is not a simple click-to-call integration. We need a production-grade browser softphone, inbound ACD, queues, routing rules, supervisor monitoring, recordings, CRM screen pops, compliance controls and searchable call logs. ## Required experience Applicants should have real experience with several of the following: * Telnyx Voice API/Call Control * Telnyx JavaScript or React WebRTC SDK * SIP and WebRTC * Browser softphones * ACD/contact-center development * Call queues and routing * Telnyx conferences * Monitor, whisp...

    $11 / hr Average bid
    $11 / hr Avg Bid
    32 bids

    I need an experienced cold caller who can jump straight into pitching our software solutions to small businesses, both in India and abroad. The focus is pure direct sales—no lead nurturing, no long discovery cycles, just clear, concise conversations that convert. Here is how the trial works: • Over the next 7 days you will complete an agreed-upon batch of calls for a flat 15 USD. • For every client you close during this trial you earn an immediate bonus on top of the base fee. • Deliver strong results and, once the week is up, we will move to a long-term engagement with a refreshed payment structure that rewards performance. To keep everything transparent I expect a brief daily call log (number dialed, outcome, next step) and quick notification the moment a sale ...

    $20 Average bid
    $20 Avg Bid
    4 bids
    FreePBX Professor -- 2
    5 days left
    Verified

    I need an experienced FreePBX professional who will teach me what I want to learn about freepbx operation and backup You can share your freepbx installation or use mine. You will look over my current installation if needed and help me fix the issues so that I can run it smoothly. So the focus is strictly on troubleshooting and ongoing support rather than fresh installation. I plan to use your experience instead of AI support. If you routinely work with Asterisk/FreePBX CLI, have a solid feel for SIP tracing tools such as sngrep or Wireshark, and are comfortable working/teaching on production systems where downtime needs to stay minimal, you are exactly who I’m after. I would like to use a help convenient with my work hours so that I don't cheat with my boss.

    $16 / hr Average bid
    $16 / hr Avg Bid
    18 bids

    I'm looking for an experienced Asterisk VoIP engineer to help with PBX configuration, specifically for call routing. Key requirements include: - Expertise in Asterisk PBX - Proficiency in configuring call routing, especially geographic routing - Experience with VoIP systems and network configurations Ideal skills and experience: - Background in telecommunications or related field - Previous projects involving Asterisk and PBX systems - Strong problem-solving skills and attention to detail Please provide examples of similar work done.

    $11 Average bid
    $11 Avg Bid
    9 bids

    Two Cisco ASA 5512 appliances • Integrate Microsoft Active Directory authentication for every local and VPN user, • Build an active-standby fail-over pair between the two ASAs • Upgrade the firmware to the current long-term-support release • Add a secondary Internet uplink that rides over a 4G/LTE modem; the ASA should keep the static fibre circuit as primary and fail over automatically to the mobile link only during outages. It is production system so credentials cannot be shared, all work needed to be done on a shared screen. Please bid If you know ASA CLI/ASDM inside out and have handled AD integration and dual-ISP designs

    $113 Average bid
    $113 Avg Bid
    25 bids

    I run a service center and I’m ready to streamline two key touch-points at once: inbound customer support calls and WhatsApp messaging. I am not working on CRM and ticketing system, so the solution must plug directly into both of those platforms—ideally through secure APIs or webhooks—so every interaction is logged automatically without any manual data entry. I only need straightforward rule-based flows: IVR menus for phone calls, and button- or keyword-driven replies on WhatsApp. Natural-language understanding is not required; speed, reliability, and clear routing rules are the priorities. Please propose the tech stack you’ll use (Twilio, 360dialog, Asterisk, Vonage, Dialogflow CX in “no-NLP” mode, or any other you prefer) along with the integrati...

    $79 Average bid
    $79 Avg Bid
    33 bids

    I need 1,000 outbound calls placed every single day to run a short market-research survey. The goal is strictly to conduct surveys, nothing else, and each call must follow a brief script that I will provide. You will receive a fresh list of phone numbers each morning along with the questionnaire. On every call you should ask the scripted questions, record the answers verbatim, and move on to the next number so the daily quota is met without fail. Any dialer that lets you hit the volume is fine—your own VoIP soft-phone, a predictive system, even a manual setup—as long as you can prove the calls were made. At the end of each day I’ll need two concrete deliverables: • A CSV (or Google Sheet) with the respondent’s answers and time-stamp for each completed su...

    $203 Average bid
    $203 Avg Bid
    13 bids

    I need a reliable virtual receptionist who can handle overflow calls during regular Eastern Standard Time business hours and then keep the line open after hours and throughout the weekend. Every call will be in English and will involve either straightforward customer service inquiries or booking and adjusting appointments in our shared calendar. An intermediate-level background in phone support is ideal. You’ll greet callers with our company name, resolve basic questions from the FAQ script I’ll provide, schedule or reschedule appointments, and log each interaction in the CRM. Whenever an issue falls outside the script, just gather the details and forward the message to me by email or Slack. Expected deliverables • Calls answered within three rings at least 95 % of the t...

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

    My operation needs a dependable SIP trunk that can originate and terminate voice traffic to United Arab Emirates destinations while keeping KYC requirements to the absolute minimum—ideally none. I am open to unlicensed wholesale routes as long as they deliver consistent quality and uptime. The trunk must comfortably handle tens of thousands of voice minutes per month, with enough concurrent channels to prevent congestion. Competitive per-minute rates, clean CLI presentation, and stable routing are critical. Please indicate whether you offer SIP registration or IP authentication, the codecs you support (G.711, G.729, etc.), and any fair-use or traffic restrictions. Deliverables • Active SIP credentials or IPs ready for testing • Current rate sheet and payment terms &bu...

    $50 Average bid
    $50 Avg Bid
    1 bids

    We are currently working on our mobile application, GCM Dialer, which handles both SIM and SIP calls. We have successfully implemented the conference screen for the SIM and SIP merge option, but we are encountering an issue where voice is not being exchanged between all parties. Below is the scenario we are testing: - User-1 has the GCM Dialer app installed and set as the default dialer. - User-2 calls User-1 via SIM, and they can exchange voice successfully. - User-3 then calls User-1 via SIP. User-1 answers, which puts User-2 on hold. User-3 and User-1 can exchange voice successfully. - User-1 clicks the "Merge" button, and all three parties are brought into one call screen. The issue is that while User-1 can hear and speak to both User-3 and User-2, User-2 and User-3 cannot...

    $148 Average bid
    $148 Avg Bid
    36 bids

    I’m building a remote customer-care line for the Turkish market and need a fluent representative who can confidently handle Telefon, E-posta and Canlı sohbet traffic. What matters most to me is detaylı bilgi verme: every caller or writer should leave with complete, crystal-clear answers even if that takes a bit more time. You’ll log in to our VoIP softphone for calls, reply to messages through our help-desk inbox, and stay present in the website’s live-chat widget during your shift. I’ll supply product sheets, reply templates and escalation contacts; you’ll turn them into friendly, accurate Turkish responses. English reading skills are a plus for internal notes, but all customer-facing language is Turkish. The schedule is flexible and there’s no fixed ...

    $1070 Average bid
    $1070 Avg Bid
    35 bids

    I need a detail-oriented Indian virtual assistant to place follow-up calls to customers who have already interacted with our sales team. These are not cold calls; the relationship is warm, and the sole purpose of each conversation is to gather feedback—specifically, suggestions for improvement on our product and overall service experience. You will receive a daily call list, a short call script, and access to our VoIP line plus a simple Google Sheet for logging results. After every conversation, note the customer’s suggestions, any pain points mentioned, and their overall sentiment. At the end of each day I expect a concise summary highlighting common themes and any urgent issues that require immediate attention. Key expectations • Confident, clear English with an Indian...

    $425 Average bid
    $425 Avg Bid
    10 bids
    Android UAE Local Calling Setup
    5 hours left
    Verified

    I need a working UAE local number that lets me place and receive calls from my Android phone exactly as if I were inside the country. Linkus is the reference point, yet I’m open to any SIP softphone or cloud-PBX solution that delivers equal or better results. Voice quality must be stable on both Wi-Fi and 4G, and the same local caller ID has to appear to the person I’m calling. SMS integration is essential—I must be able to send and receive texts on the very same UAE number through the chosen app or an associated API. Acceptable solutions may involve: • Provisioning a UAE DID, SIP trunk or virtual number. • Full configuration on an Android softphone (e.g., Linkus, Zoiper, Grandstream Wave, etc.). • Demonstrated test call and SMS exchange showing local...

    $127 Average bid
    $127 Avg Bid
    32 bids

    AkÅŸam 17:00 – sabah 05:00 vardiyasında, iki ayrı telefon hattıma gelen aramaları yalnızca Türkçe olarak karşılayacak deneyimli bir bayan sekreter arıyorum. İşin ana sorumluluÄŸu, arayanları kibarca karşılayıp ilgili bilgileri alarak bana iletmek; bunun dışında toplantı planlama veya e-posta yönetimi beklemiyorum. ÇaÄŸrılar sanal bir santral (VoIP) üzerinden size yönlendirilecek, bu nedenle güçlü ve kesintisiz bir internet baÄŸlantınızın olması ÅŸart. Her aramanın sonunda kısa bir notu CRM’ime veya WhatsApp üzerinden iletmenizi rica edeceÄŸim; böylece gece boyunca oluÅŸan talepleri sabah hızlıca görebilirim. Sürekli gece çalışmaya uygun olduÄŸunuzu, daha önceki benzer deneyimlerinizi ve kullanacağı...

    $15 Average bid
    $15 Avg Bid
    2 bids

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