---
title: "Discussion on \"Build AI Call Agents with Azure OpenAI Realtime API (Start FREE with $200 Credits): Manual vs. RealtimeSIP\" | Hashnode"
description: "Discussion on \"Build AI Call Agents with Azure OpenAI Realtime API (Start FREE with $200 Credits): Manual vs. RealtimeSIP\". TL;DR: Azure gives you $200 FREE credits to test AI call agents with GPT-4o voice. Build it yourself with Azure + Twilio + Node.js (12+ hours, 450+ lines of code) or use RealtimeSIP (paste Azure endpoint, 5 minutes, zero code). EU data residency incl..."
url: "https://hashnode.com/posts/build-ai-call-agents-with-azure-openai-realtime-api-start-free-with-200-credits-manual-vs-realtimesip/6910ff9aa60f58194b551455"
---

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# [Build AI Call Agents with Azure OpenAI Realtime API (Start FREE with $200 Credits): Manual vs. RealtimeSIP](https://blog.realtimesip.com/build-ai-call-agents-with-azure-openai-realtime-api-start-free-with-200-credits-manual-vs-realtimesip?utm_source=hashnode&utm_medium=feed)

TL;DR: Azure gives you $200 FREE credits to test AI call agents with GPT-4o voice. Build it yourself with Azure + Twilio + Node.js (12+ hours, 450+ lines of code) or use RealtimeSIP (paste Azure endpoint, 5 minutes, zero code). EU data residency incl...

Nov 9, 2025 · 11 min read · blog.realtimesip.com  
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-   [#openai](https://hashnode.com/tag/openai)
-   [#ai-call-agents](https://hashnode.com/tag/ai-call-agents)
-   [#azure](https://hashnode.com/tag/azure)

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