The latest articles on DEV Community by Alarade (@9mtm). https://dev.to/9mtm https://media2.dev.to/dynamic/image/width=90,height=90,fit=cover,gravity=auto,format=auto/https:%2F%2Fdev-to-uploads.s3.us-east-2.amazonaws.com%2Fuploads%2Fuser%2Fprofile_image%2F4098359%2F451f1e38-5a8b-4f53-a3b3-186e2d821ea6.jpg https://dev.to/9mtm en Alarade Fri, 28 Aug 2026 05:11:29 +0000 https://dev.to/9mtm/open-source-ai-phone-assistant-call-chat-25oe https://dev.to/9mtm/open-source-ai-phone-assistant-call-chat-25oe <p>Phones are still where real business happens. Missed calls are missed customers, and most small teams can't afford a 24/7 receptionist. So I've been building <strong><a href="https://tel-agent.com" rel="noopener noreferrer">Tel-Agent</a></strong> — an <strong>open-source AI phone assistant</strong>: an agent that answers your business line, talks naturally with callers, and takes action — booking appointments, answering questions, taking messages — then hands you a clean summary.</p> <p>🔗 <strong>Website:</strong> <a href="https://tel-agent.com" rel="noopener noreferrer">tel-agent.com</a><br> ⭐ <strong>GitHub repo:</strong> <a href="https://github.com/Dpro-at/Tel-Agent" rel="noopener noreferrer">github.com/Dpro-at/Tel-Agent</a></p> <h2> What it actually does </h2> <ul> <li> <strong>Answers every call, 24/7.</strong> No voicemail black hole. The agent picks up, greets the caller in a natural voice, and handles the conversation.</li> <li> <strong>Understands intent, not keywords.</strong> It's built on modern LLMs, so callers can speak normally — no "press 1 for sales" menus.</li> <li> <strong>Takes real actions.</strong> Booking a slot, capturing a lead, answering FAQs from your own knowledge base, or escalating to a human when it should.</li> <li> <strong>Reports back.</strong> Every call ends with a transcript and a summary, so you know exactly what happened while you were away.</li> </ul> <h2> Why open source? </h2> <p>Voice AI is too important to be a black box. Your call data is sensitive — customer names, numbers, intents. With an open codebase:</p> <ul> <li> <strong>You can self-host it</strong> and keep call data under your own control.</li> <li> <strong>You can audit it.</strong> No guessing what happens to recordings or transcripts.</li> <li> <strong>You can extend it.</strong> Every business has weird edge cases; open code means you can wire in your own CRM, calendar, or language.</li> </ul> <p>Tel-Agent is released under <strong>AGPL</strong>, so improvements flow back to the community.</p> <h2> How it works (the short version) </h2> <p>The pipeline is the classic voice-agent triangle, tuned for latency:</p> <ol> <li> <strong>Telephony layer</strong> receives the call and streams audio.</li> <li> <strong>Speech-to-text</strong> transcribes the caller in real time.</li> <li> <strong>The LLM agent</strong> decides what to say and which tool to call (calendar, FAQ, message-taking).</li> <li> <strong>Text-to-speech</strong> answers back — fast enough that the conversation feels human.</li> </ol> <p>The hard part isn't any single step — it's keeping the round-trip under ~1 second so the caller never feels like they're talking to a robot on a delay. Interruption handling ("barge-in"), silence detection, and graceful fallbacks took more iteration than everything else combined.</p> <h2> What's next </h2> <p>The roadmap is public and moving: multi-language support (including Arabic — underserved in voice AI and personally important to me), deeper calendar integrations, and better analytics on call outcomes.</p> <p>If you've ever wanted your business phone to just <em>handle it</em>, or you're curious how real-time voice agents are built — check out the repo, star it if you like the idea, open an issue, or just say hi in the discussions:</p> <p>👉 <strong><a href="https://github.com/Dpro-at/Tel-Agent" rel="noopener noreferrer">github.com/Dpro-at/Tel-Agent</a></strong> · <strong><a href="https://tel-agent.com" rel="noopener noreferrer">tel-agent.com</a></strong></p> <p><strong>Every missed call is a missed opportunity. Now your phone can answer for itself.</strong></p> ai opensource python agents