Build AI Call Agents with Azure OpenAI Realtime API (Start FREE with $200 Credits): Manual vs. RealtimeSIP
Nov 9, 2025 · 11 min read · 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...
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