blog.realtimesip.comBuild AI Call Agents with Azure OpenAI Realtime API (Start FREE with $200 Credits): Manual vs. RealtimeSIPTL;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.comBuild AI Call Agents with OpenAI Realtime SIP: The Manual Way vs. RealtimeSIPTL;DR: OpenAI's Realtime SIP API lets you connect phone calls directly to GPT-4o for natural voice conversations. You can build it yourself with Twilio + Node.js (8+ hours, 300+ lines of code) or use RealtimeSIP (paste API key, 5 minutes, zero code)....Nov 9, 2025·5 min read
