Handle multiple calls at the same time

[HyxerPyth]

I'm working on application where I need to handle multiple incoming calls and conversations at the same time on one phone number.
I'm building an app where you can talk to an AI. So, im streaming the audio from twilio in order to transcribe text and than I use AI to respond back to customer. But I don't understand how to have multiple conversation with customers on the same phone number at the same time, without any lines and redirections to other phone numbers.