I'm trying to connect the pi 4 model B to a phone that I bought off Amazon (https://www.amazon.ca/Wild-Wood-Phone-Retro-Design/dp/B00H20B2GM). This phone is not connected to a landline or anything as it's just sitting on my table for fun. I've gone through various tutorials and posts online. I'm really confused as I'm trying to play recorded audio files on the phone using the pi and also save audio on the pi using the phone handset. I think it would be a fun way to use these cool phones!
From what I've found so far, it looks like I might need a modem like this (https://www.usr.com/products/56k-dialup-modem/usr5637/) that I could use to send and receive audio using the pi to the phone. I need to connect the RJ11 cable to the Raspberry Pi and send and receive audio using that interface. Basically, I'm trying to play some audio on the phone when I lift the handset and then be able to record audio too! I think the USB might be too much.
Can someone please give me a few tips if any to help get this going? I'm new to all this so trying to figure it out. Thanks!