Everything I find is non-technical shit mainstream media hype.

I'm using Frigate with these TAPO cams:

Tapo 2K+ Indoor/Outdoor Wired Security Camera, Baby Monitoring, C120

The CAMS support the RTSP protocol, which works with Frigate.

Yes the cams support audio mic and speaker when connected to the TAPO service and using the TAPO phone app.
But I do not want to use TAPO's service and their app / servers.
I keep my cams on a separate router / subnet which does not have internet access.

Only my Frigate server has a network interface on that subnet, so it can access the cams feeds via RTSP.

Now I would like audio intercom so I can listen to audio or talk through a speaker using the Frigate phone app.

I don't see such an option in Frigate.
I see there is something called "go2rtc" but I'm not sure if these cameras support this. Or even how that protocol works.
I'm willing to buy a new cam, different model or manufacturer if necessary is fine.

How can I achieve this?

Please add more. Feel free to add yordor.

Taken from comments originally in this post https://lemmy.zip/post/64613533

I’d like to host this on the Ubuntu Linux box in my home office and put a camera in my living room. Would like to be able to monitor the camera from an iPhone, and have it auto record on motion detection.

For external access though, I don’t have a domain name registered, and I’d rather not have one. I’d be happy to access this just using my external IP address. But I don’t know how “static” the IP address from my ISP is. (My router gets it via DHCP, but I don’t know how long those leases are, or if it re-uses the same IP when renewing.)

Edit: Also what is a good camera to use? Seems like a lot of these cams require registration with some shady service and their own app to view them. Which means that all of that is running through their hosted service, which I am trying to avoid.