Vonage?

[cd34]

selena,

I use a linksys router which allows me to set Quality of Service (QOS) for one port. I put the vonage device on one port, set the priority on that built in port to high and haven't had a problem since.

gobgook2,

Depending on your router, same issues as selena. You might try to enable quality of service settings to prefer your voip traffic. AT&T does offer their own VOIP service 'Callvantage', however, like Vonage, Internap provides the bandwidth for it. If your link is busy, you can reduce your MTU on your router and get better voip performance in exchange for slightly slower large downloads.