Once you're logged into Groove, hit the setting button and just look through all the options. I found that the default settings work pretty good for me.
Audio/echo
Echo cancellation/basic echo canceler checked
Echo Tail: 100-300ms
Speaker Vol: 0
Mic Gain: 0
I'm not sure if those are default, but that's what mine are. Don't think anything else was changed. A good "test" is to call this "echo" number 909-390-0003 and talk. It will respond with what you say. If you hear an echo, you probably need to tweak something.