Voip Call With Miui Phone App?

Feb 18, 2015
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?