I have a WRT54G v 1.1. I have an ATA DLink (from Primus) behind my linksys router for 2 VoIP phone lines. People often complain that they can hear their voice in echo. I can hear them very well. No echo at all. I'm using HyperWRT Thibor 15, but QoS on this firmware is really straight. I'm gonna try to put the ATA in front of the router to test if echo is cancelled. I will know if the problem comes from the router or the ISP. In case it's the router, can Talisman VoIP help me? Does anybody have an idea?