Isn't it odd that, nowadays, we expect DVD quality in the videos we watch, CD quality in the music we listen to, and, increasingly, HD quality in the TV we watch, 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 it are now digital, our public switched telephone network remains constrained by a
set of standard assumptions and technologies that really haven't changed for decades.

One of the advantages of IP telephony is that it is capable of fairly breathtaking sound improvements compared to traditional PSTN quality.