change calling and group call api add new -- 2

Hi sir. I have read your project requirement very carefully & I understood it completely. Clear as water. I am going to use the Agora SDK in your app. Agora includes full support across a range of tech stacks making it easy to deliver deep integration of high-quality, extreme low-latency video calling across all platforms and channels. I have 10+ years of experiences in this field and I have already developed many apps. If you want discuss more, Please send me message via chat. I'll wait for your message. Regards.