Adapter: Linksys RT31P2
ISP: Comcast (Speed, who knows with Comcast. I just did a speedtest, and it showed 20 Down 3 Up, Those numbers seem high)
Setup: Have tried it both ways, currently behind a Linksys switch running dd-wrt because when the VoIPo TA goes south, it takes my internet for my computers with it. Since my wife works from home alot, can't have the internet down.
How often not working: Every few days I will try calling home and it will go straight to voicemail, or I'll get an email that I just got a voicemail, and the phone doesn't ring, or I'll go to make a call, and no dialtome. I just go and unplug and plug back in, and it works. I have ports forwarded, the TA in the DMZ. Still happens every few days.