I’ve used Vonage for voice since August, 2004. Voice was okay; it was never great. There was always some delay/latency. Sometimes it wasn’t really noticeable, and other times it was very distracting–it seemed like a whole second between the time you spoke and the time the other person heard you speak. You’d be surprised how awkward that makes conversation, because you’ll often be inadvertently interrupting the person you’re speaking to, and you won’t realize it for a second.
I decided that I needed some Quality of Service (QoS) so I replaced my router with one of these D-Link GamerLounge
routers. That series of routers has a much more aggressive QoS than other routers, because it will constantly break large, lower-priority packets into smaller segments. See, while QoS will prioritize realtime traffic like Voice over IP (VoIP) over traffic like Web transfers (say, HTTP and FTP), it can only prioritize queued traffic. That helps, but if the router is in the middle of transferring a large packet, it can’t be interrupted with a VoIP packet, and the VoIP packet has to wait the few milliseconds it takes to transmit the large, lower-priority packet. The GamerLounge routers minimize this effect by fragmenting all large, low-priority outbound packets so that the interruption will be less.
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