Thanks for your reply, Mr. Sith.
I can make calls fine on speaker phone or not, all other functionality related to the phone working on calls (speaker phone and handset) is fine...that's the mystery - the phone only seems to not be able to hear me when using VAD.
I upgraded to the most recent 8130 OS some weeks ago, things have worked fine w/VAD the whole time since then, so I have doubts that it's an OS issue (also haven't seen any issues w/VAD raised on the OS release thread...
I don't mind doing the OS dance, but want to see if there are any other simpler ideas first...
I was thinking maybe I would remove and then reinstall VAD...