I know VoipO issues the HT502, but I can honestly say that I don't have any experience with that adapter. I've been with VoipO since the beginning. Actually, before that as a Beta and before that an Alpha tester. I believe I may have had the HT502 for a brief period of time in the early days, but then VoipO started issuing the Linksys PAP2 voip adapter. I've been using that for numerous years now without any issues. I've used it with a Trendnet router and for the last couple years a Linksys E3000. Again; no issues at all. I do give my voipo adapter a static IP address from my router. I do port forwarding. (UDP Only). And most times I do QOS. However; with 30mb down and 5mb up broadband, I've never had a bandwidth issue and haven't found QOS on or off to show a difference. As someone who works on a lot of electronics, including computers and networks, I have found that as part of my PMI (Preventative Maintenance Inspection), I routinely reboot my entire network. Meaning, about once a month or two. Late at night, I'll power everything down and after a minute I'll power up again in a sequence. Then again, I open my computers, TV's, BluRay, and other tech toys periodically and clean them out. Anyway; I don't have any voip issues at all.