I've never had a traffic vector with VOX.  The manual states "enroute traffic" instructions and that they will vector you.   I've had several TCAS advisories and multiple near misses with nothing at all from the controller.

 

I get them every so often but they seem like they are bugs. ATC will do a traffic alert and a heading directive followed almost immediately  by a change back to the original  heading and a statement that the traffic is cleared. The reason I think that  this is in error is that I never see any nearby traffic either visually or by TCAS.

I normally fly the Airbus, and I'm constantly seen traffic too close for comfort, and get avoidance alert from my airbus, but never get any alerts from ATC itself.

The "feature" apparently has both false positives and false negatives.