We have a Cisco 1720 and a Cisco 3600 that we would like to use multilink to bond 2 T1's together. We put a VWIC 2MFT-T1 in each Cisco and configured the ports to use multilink and everything seemed like it would work but we realized when we opened for business the next day that packs were being dropped in a big way...I would see pings at 4ms then 1100ms then time out. It got to the point where I had to go back in the config and take the multilink off and just drop one of the T1's. Is it possible to configure these two routers to do multilink? Not sure what info you need so just ask if this is not enough information.