I have a 1721 router with at WIC 1DSU T1(version 1) card. The router is running a static VPN tunnel to another site. With all of the IP services running and traffic the router is hitting 90% and dropping VOIP traffic. I upgraded the router to a 2811 with a WIC 1DSU T1 V2 card. The router dropps every other ping and traffice but it doesn't sho up in a <sho int> command. I upgraded to IOS version c2800nm-advsecurityk9-mz.124-15.T5.bin. Is there a compatibility with the DSLAM? The routers have somewhat of the same config on them. Any suggestions? BTW I think that the ISP us spoofing a frame-relay connection and it is really ATM.