skype and other *phones

[Tsu-Fan Cheng]

Hi people,
  hapy holiday! i have a question about the internet phone apps, what is the
major difference between skype and other *phone system? and I know that bsd
has limited support of sound card that works with skype in the past, I
wonder if the support is getting better these days? and also how is the
driver support for other *phone apps? thank you for your time!!

TFC