GoToMeeting sessions hog all my networks bandwidth... I have business class cable and other video/audio apps (e.g. Skype, Google Hangouts or Webex) work properly.
In a session yesterday, I initially tried connecting via VoIP from a Windows 8.1 machine and the audio was very robotic. I stopped VoIP and dialed in from my VoIP phone and while GoToMeeting was still connected, my phone audio was very flakey.
As soon as I dropped GoToMeeting, my VoIP phone worked properly. I switched to Google Hangouts (with video) and everything was fine.
I have a DD-WRT router and QoS is not turned on.