We had to upgrade from a 1700 series router to 2801 router. The 1700 router had a WIC-1T with an external CSU/DSU. This was replaced with a 2801 router with VWIC-1MFT-T1 card (integrated CSU/DSU). The idea is to elimiate external CSU/DSU. There was a frame-relay link on the router which use to work fine with 1700 router in place.
After upgrading to the 2801 router with VWIC card, there are issues with frame-relay. The PVC link is up and active, but traffic is not passing. See the logs attached for the running config and relavent logs. We are not even able to ping the serial IP of the directly connected router.