I have a Vonage V-Portal attached to my DIR-655 and I set up a QoS Entry for it to improve my call quality.
I noticed that the router does a soft restart when printing documents longer than 2 pages if I have this entry enabled. I have tried 1.30 through 1.32beta but I still have the problem. So my choices are - clearer calls/no call drops, or using the Shareport feature. I bought the router for both.
P.S. I have my eye on the DIR-685 for the storage and multi Shareport features. If it has the same issues, count me out.
I have Vonage also but with a very active Lan load 2 wired pc's, xbox360, wireless laptop, 2 wireless desktop.
QoS is a very good Ideal but I never could stop the dropped calls or choppy audio until I gave Vonage V-Portal a Static IP, with Mac filters active and DHCP running the lan.
Since doing so I have not had dropped calls or choppy audio. Qos just can't handle the load of torrents and heavy load I'm thinking. I don"t even have it enabled anymore.
Also since the issue with the firmware, even if the router reboots the static ip is rock solid.
If your making changes inside the routers firmware you'll prolly have to reboot the V-Portal from time to time. Just keep an eye on it.