Record Phone to Podcast Platform

I have a call that I want to record for 4 participants. I am using [login to view URL] in which 3 of the participants will be joining via their computer using audio and video. However one of the participants can only use a telephone to call in. [login to view URL] does not allow for calling in via a phone number. So my idea was to setup another computer for that user. He will call my Google Fi phone number which I will pick up on that computer. 1. Google Fi which the user will be calling my phone number allows you to select the microphone and speakers. The user calling for the microphone will hear the system audio from our conversation on [login to view URL] When the user calling Google FI speaks, then 2. [login to view URL] microphone will get the audio spoken from the user calling Google Fi. So that when the person calling in to Google FI will hear what is spoken on the [login to view URL] call. Please let me know if this is possible. If so this project will just be instructions on how to set it up on the computer