Do I need a second phone line to demo my voice ai agent?

I've watched several YouTube videos where someone is calling a phone number to demo the ai voice agent. I too would like to demo my ai voice agent (once I land on which one I'll be using). Do I need to purchase a 2nd phone line to be used to demo my ai voice agent or is there another service or way I can call my own number or allow a prospect to call my number and demo the agent? Thanks!

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