Welcome to the Community!
Phone 1 port is the one that we activate for Homephone, hence, we advise you to simply use that port.
Using your community details, I was able to locate your records and make the necessary adjustment to disable call waiting.
Please test and let me know how it goes.
You are correct, if someone calls your phone while you're at it, they should get a busy tone. That's the reason why I had to make an adjustment earlier to try to address that. I'm sorry for the confusion there.
Since it's still not working even after the adjustment I made, can you perform a reset on the modem? There's a small reset button at the back.
Thanks for performing the reset, @CUZ11N.
I had to readjust the settings again since the modem has been reset. Can you try and test it once more and let me know how it goes?
Please ensure not to plug anything on Phone 2.
Thanks for keeping us in the loop, @CUZ11N.
If you're okay with the current setup, then I guess we'll have to leave it as is at the moment. However, should you ever want us to try to crack on this mystery, do let us know.