So you make a call to someone - say X - using qgvdial and the "dial back" setting... and you get a call back that rings only 4 times before it goes to voicemail? Are you able to pick up before the 4 rings finish? For the first month or so I kept being able to pick up sometimes not. Then I realized that TMobile had set the voicemail for my number to 15 seconds. I told them to completely disable voicemail for my number. In any case Google Voice already has voicemail, there was no need to have yet another voicemail.