Apple haven't "rejected" Google Voice

Apple's response to the FCC investigation over allegations of Apple rejecting Google's Google Voice app are unfounded, maybe.

Apple is still considering whether it should allow the application into the app store. It has not consulted with the MNOs and it's still in internal discussions.

Of course Apple's indecision is pretty much equivalent to them rejecting it, at least until they make a decision as a non-decision means no entry into the app store.

If Google Voice is allowed in, it could mean a change in policy for other VoIP applications which "intercept" the dialer.