Agora's Software Defined Real-Time Network (SD-RTN™) is a unique infrastructure designed for real-time engagement, serving as the backbone for its voice, video, and live-broadcasting software. This guide outlines the process of transitioning a video application from using Frozen Mountain's Icelink SDK to Agora's iOS SDK, highlighting the ease of setup and reduced complexity with Agora. It starts by setting up CocoaPods for integrating the Agora SDK, followed by initializing the Agora singleton and configuring local and remote video views. The guide emphasizes the simplicity of joining channels and managing user connections with Agora, which requires significantly less code than Icelink. Additional functionalities like switching cameras and leaving channels are also seamlessly managed within this framework. The walkthrough concludes by encouraging developers to explore further resources and community support for a comprehensive adoption of Agora's solutions.