High Definition voice
Isn't it odd that these days we expect DVD quality in the videos we watch, CD quality in the music we listen to, and, increasingly, HD quality from our TV channels. But when it comes to phone calls, we settle for the sound produced by a technology that's almost one hundred years old?
It's true that even though parts of our public switched telephone network are now digital, it remains constrained by a set of standard assumptions and technologies that really haven't changed for decades.
One of the advantages of IP telephony call quality is that it brings with it breathtaking sound improvements compared to traditional PSTN quality, including high definition voice.