I think he is referring to the "very low volume" fix where the ringtone you have selected stops playing after 1 ring , and then the call is announced at an extremely low volume. It's the 1st post of page 4 or page 5 of a different VC thread here. I'll look and try to post a link.
Here it is. Credit is the OP's below.
Originally Posted by
rprochnow 
The problem with the call announcement on the TP doesn't appear to be with Voice Command, but possibly with the phone software on the TP - since Voice Command is generating the announcement file - it's just not being played.
The following registry changes might partially restore the call announcement, a short-term solution until something better comes along:
HKCU\ControlPanel\Sounds\TTSAnnounce\Category: change VoiceCommand1 to Ring
HKCU\ControlPanel\Sounds\TTSAnnounce\Script: change as5p to v0p (for vibrate and ring) or p (for ring only)
With this change, the ringtone will start - and then be interrupted with the calller ID/name announcement. (Assuming that call announcement has been enabled in Voice Command).
Only major flaw with this solution is that the announcement volume is low.