Last I heard, Whisperpush on CyanogenMod only actually worked if you had the GApps package installed which isn't entirely legal and certainly isn't something they could get away with including as standard.
http://wiki.cyanogenmod.org/w/Google_Apps
The best disclaimer sentence I've found here is: The Google Apps packages are NOT SUPPORTED in any way by Cyanogenmod. Not exactly a huge endorsement, but saying it's not entirely legal is something else entirely.
Would like someone who has expertise to somehow reconcile the above comment to an article like this if possible: http://www.androidpolice.com/2013/12/19/the-oppo-n1-is-offic...