I have two 1721 Routers that are connected via a point to point T1 which connects into a WIC 1DSU T1 card on each of them. We have had our T1 go down twice and both times one of the routers needs to be rebooted to allow traffic across the network. Any suggestions on how to fix this?
Can you please paste in a copy of the sh run of the serial interfaces and a show service-mod of them? Can you also let us know what version of IOS the routers are running.
This will help us to pin point the issue.