Right. The problem was is that the majority of my users were non-technical. So I was left with the choice of: 1) picking voip software that supports username

Right. The problem was is that the majority of my users were non-technical. So I was left with the choice of: 1) picking voip software that supports username/password authentication that they would be familiar with since virtually every other service on the internet works in a similar fashion vs 2) picking Mumble and trying to explain to them how to import/export their identity certificates for all their owned devices and also explaining that they need to keep the cert handy on a flash drive or store it in the cloud so that they can import it on machines that they might not own