Default CyanogenMod VoIP

I noticed in one of the CM11 fixes was "fix VoIP". I've been trying to search for anything that talks about CM's VoIP - what it is, what it does, how to set it up, etc. - but to no avail. I've tried Google, Bing and (yes) XDA.

Does anybody have any information on the CM VoIP application? Could it be used as a Wi-Fi calling app?

Any assistance would be greatly appreciated. Thanks.

Current Device: Samsung Galaxy S III d2tmo - SGH-T999
ROM: CyanogenMod 09/01 Nightly
Kernel: Stock
Modem: UVUENC2
Recovery: TWRP 2.7.0.0 Multiboot

Retired Device: HTC Glacier (myTouch4G)