I have two v3 WRT54G's - one at my house, one at my girlfriends. I installed Hyperwrt Tofu 13c on both. At my place I have a Surfboard SB5100 modem, to the router, which connects to a Vonage adapter, two PCs and a TiVo. I use the Hyperwrt QoS to prioritize the VOIP adapter. This works perfectly, even through heavy uploads and bittorrent traffic. My girlfriend has a similar setup, except that her modem is an old RCA DCM105, and uses a VoicePulse SPA-2002 VOIP adapter. We both have Charter 3/256 cable, with acceptable upload and download rates, based on various tests. Despite having the same modem, with the same firmware and settings, I cannot get QoS to work properly on her setup. Uploads invariably cause jittering on the other person's phone. I have also tried Thibor 14, which makes no difference. I have been careful to do factory resets and to clear NVRAM before and after flashing firmware. Naturally I have read very carefully all information about proper implementation of QoS, and have tried numerous different settings. Does anyone have any ideas? I am willing to try your suggestions.