Default [Q] Internet Call Settings

Can someone explain to me why there are no Internet Call Settings on some ROM versions? I **THINK** it depends on which source is used and the modded official firmware does not have it, but the AOSP (CyanogenMod??) versions do?

The ROMs that I like most do not have the feature, so I will likely have to try and theme the AOSP to look like Insanity the Wicked_V10 (currentl favorire). But have Blue Lightning installed for use as extension to my PBX.

Any information appreciated!
Samsung Galaxy S4
TWRP
BlueLightning-20140222-jflte / Wicked_v10