What the heck? HD VoIP is apparently the latest marketing scheme by Canadian telco Iristel. Apparently it adds CD quality voice calls to standard VoIP which is, to put it lightly, about as useful as… I don’t even know. Sounds essentially like bullshit.
Generally, friends, VoIP is fairly low quality simply because it can be. If you want high quality VoIP get a nice headset and download Skype. It’s not like your telephone can reproduce the wonderful glottals of Mariah Carey through a tinny speaker and ’50s-era amplifier.