How good is good enough?

Has anyone else noticed that phone calls just don't seem to be as good as they were 10-15 years ago? I had a number of radio interviews in the wake of the recent tragic breakdown in communications that may have contributed to the death of a Calgary toddler. Many of the discussions surrounded the potential for compromise in 9-1-1 location information associated with nomadic VoIP. With over-the-top VoIP, the phone line just cannot be as reliable as a traditional circuit switched phone service. I