Incoming Call - Callers cannot hear recipient - stock dialer only

[DroidNYer]

Using the latest nightly of GummyRom. Rom works great except, when I answer an incoming call using my Bluetooth headset, I can hear the caller however, the caller cannot hear me. I then have to switch to the handset.

However, my Bluetooth headset does work when receiving an incoming call via Google Voice. I am suspecting it is the Google Apps Dialer. I use Google Voice with the Google Hangouts Dialer app hence, the incoming call executes the Google Hangouts Dialer and not the stock Dialer. (you can tell, the screen looks different when someone dials my Google Voice Number - the Hangouts Dialer shows an incoming call with a green alert box).

No issues at all when placing a phone call.

I have already tried wiping and starting from scratch.
Thanks in advance for any guidance.