This will be hard to do because it depends on your definition of quality. There are many factors that affect call quality and you can optimize for resillience a

This will be hard to do because it depends on your definition of quality. There are many factors that affect call quality and you can optimize for resillience against some while getting bitten by others. Lately I've noticed web browers being a bit on the aggressive side when setting up connections and that disturbs the flow of packets for some video/audio connections. I work in the Cisco Spark team so I'm not unbiased when it comes to Skype but you might have a quality problem on your network connection (and the other participants' connections too) if you're seeing consistent audio issues. Real-time media (audio/video) is very sensitive to delay, jitter, congestion and all the network stuff that normally goes un-noticed with web browsing, and there are still plenty of cases that just can't be covered by error correction. (This is where having the ability to fall back to PSTN to join a call comes in very handy: if I'm in a coffee shop with a crappy connection, there's a strong chance that my call will be of poor quality so I join with my cell phone instead.)