No voice on incoming calls.

[voipinit]

In my case I got an email from tech support that I had set "block unknown callers" which blocks anyone not on the whitelist. . .

FYI, selecting "block all unknown calls" in the "block private calls" tab only blocks calls marked as private, anonymous etc.

In call routes you can "block all unknown contacts" which will block anyone not in your contact list or whitelist.