I have a new internet provider and phone calls are IP based. I want to use the Redmi Note 3 Pro, with latest developer ROM as IP Phone. There are several third party apps with this function, but all use there own caller and there own contacts. I want this function with the original MIUI caller an contacts. I have found VOIP settings, but it seems to be, this settings have no effect. VOIP settings or not, I don't find a way to initialise a VOIP call without a third party app. This apps have there own settings, so the question is, why are there MIUI settings?