What tools are you using for real-time phone calls with AI? I need some sort of AI call assistant badly

I’m looking for tools that allow real-time phone calls or voice conversations.

Essentially, I’m looking for something that feels natural in a real phone conversation. Somewhat like ChatGPT’s voice mode (the “um’s, uhh”, etc make it sound very realistic).

What app/company or AI have you used or tested that wo⁤rk well for this?