Okay two days down and only a couple complaints.

- Call waiting beep - Crisis call center workers were consistently getting a call waiting beep since these are dual line phones, I could not find a way to turn off the dual line feature, but I did find out how to disable the beep.

- Turns out the "computery" sounds was a bad handset, replaced with a 2nd set and it works fine so far.

Everything else seems to be working as it should. And it better stay that way as I am on vacation next week!