Asus' handling of the topic VoLTE and VoWIFI is simply disappointing. I bought an Asus Zenfone 7 Pro which wasn't exactly cheap and has the claim to be in the upper class. After more than 2 months there is still no provider supported in Germany, also VoWIFI is not in sight. Support requests are answered evasively.
This is particularly disappointing, since it is a simple software problem. Considerably cheaper models of the competition can do both out of the box.
If the problem is not solved in the coming weeks, e.g. with the update to Android 11, I will sell the 7Pro again.
