Make sure you push the original build.trout.prop and build.prop files back to your system...this is what worked for me.
Hey after wrestling with Google Voice not working with the changed Build.props I found out a quick and dirty workaround. Just go back to Google Voice 0.2 and the build.props aren't a problem!
Get it here: http://forum.xda-developers.com/showthread.php?t=577163&highlight=Google+Voice
Just do adb install -r com.*0.2 APK FILE HERE*
I'm back up and running now! Hope this helps!